Evaluation of Soybean Varieties Resistant to Soybean Cyst ... · Evaluation of Soybean Varieties Resistant to Soybean Cyst Nematode in Iowa—2015 Gregory L. Tylka, Gregory D. Gebhart,

A supplement to Iowa Farmer Today.

Evaluation of Soybean Varieties Resistant to

Soybean Cyst Nematode in Iowa—2015

Gregory L. Tylka, Gregory D. Gebhart, Christopher C. Marett, and Mark P. Mullaney

Department of Plant Pathology and Microbiology Iowa State University

This report is available online at www.isuscntrials.info.

IPM 52 Revised December 2015

View of the east central Iowa location.

2

Evaluation of Soybean Varieties Resistant to Soybean Cyst Nematode in Iowa in 2015

Gregory L. Tylka, Gregory D. Gebhart,

Christopher C. Marett, and Mark P. Mullaney Department of Plant Pathology and Microbiology

Introduction

Use of resistant soybean varieties is a very effective strategy for managing soybean cyst nematode (SCN), and numerous SCN-resistant soybean varieties are available for Iowa soybean farmers. Each year, public and private SCN-resistant soybean varieties are evaluated in SCN-infested fields throughout Iowa by Iowa State University personnel. The research described in this report was performed to assess the agronomic performance of maturity group (MG) I, II, and III SCN-resistant soybean varieties and to determine the effects of the varieties on SCN numbers or population densities.

Materials and Methods

In the northern Iowa district, 51 glyphosate-resistant, SCN-resistant soybean varieties were evaluated using Roundup® herbicide, and 11 non-glyphosate-resistant (six LibertyLink® and five conventional), SCN-resistant soybean varieties were evaluated using conventional herbicides. The northern Iowa experiments were conducted near Newell (northwest Iowa), Manly (north central Iowa), and Lawler (northeast Iowa). In the central Iowa district, 51 glyphosate-resistant, SCN-resistant soybean varieties were evaluated using Roundup® herbicide and 13 non-glyphosate-resistant (eight LibertyLink® and five conventional), SCN-resistant soybean varieties were evaluated using conventional herbicides. The central Iowa experiments were conducted near Moorhead (west central Iowa), Ames (central Iowa), and Urbana (east central Iowa). In the southern Iowa district, 51 glyphosate-resistant, SCN-resistant soybean varieties were evaluated using Roundup® herbicide and ten non-glyphosate-resistant (eight LibertyLink® and two conventional), SCN-resistant soybean varieties were evaluated using conventional herbicides. The southern Iowa experiments were conducted near Glenwood (southwest Iowa), Oskaloosa (south central Iowa), and Fruitland (southeast Iowa).

Location-specific details.

1 In the SCN HG type test results, “2” indicates >10% reproduction on PI 88788, “5” indicates >10% reproduction on PI 209332, and “7” indicates >10% reproduction on PI 548316.

SCN-susceptible varieties also were planted in the experiments for comparison purposes. All plots were four 17-foot-long rows spaced 30 inches apart and were planted at 10 seeds per foot, with four replications per variety. Seed companies were encourage to treat their seed with fungicide and insecticide. Seeds that were received untreated were treated with CruiserMaxx® by Iowa State University personnel. A complete treatment list is included at the end of the report. Preplant herbicide was applied to each location. The Lawler location was planted using “no-till” methods, and both the Fruitland and Moorhead locations were minimally tilled. At all other locations, the seed bed was tilled prior to planting. At growth stage R6 all locations were scouted for Sudden Death Syndrome (SDS). The Oskaloosa site was found to have SDS so the plots were rated for the disease using the Southern Illinois University method of SDS scoring (0 = no disease, 100 = all plants prematurely dead). Further details of this rating technique may be found at www.scnresearch.info/462.pdf. All plots were end trimmed to a length of 14 feet during September. Maturity notes were taken at one location in each district, but for reference purposes, maturity dates are listed in the tables for all three locations in the same district. Maturity was recorded as the number of days after August 31st that a variety was considered mature. A variety was considered mature when 95 percent of the pods had turned brown. For all locations, just prior to harvest, average plant height and lodging (1 = all plants fully erect, 5 = all plants flat) were assessed in each plot. For each location, the center two rows of each four-row plot were harvested with a plot combine, total seed weight per plot and seed moisture were determined, and total plot seed weights subsequently were converted to bushels per acre. Resistant varieties and susceptible check varieties are grouped separately and are listed in the report in order of descending yield.

At the beginning of the growing season, plots were sampled for the presence of SCN. Soil samples, consisting of 10 one-inch-diameter, six- to eight-inch-deep soil cores were collected from the center 14 feet of the center two rows of each plot immediately after planting. SCN cysts were extracted from each soil sample, and SCN eggs were extracted from the cysts and counted. SCN egg population densities also were determined for each plot at the end of the growing season in an identical manner. Because of the consistent relationship between higher soil pH and SCN population densities, all varieties also were field tested for tolerance to iron deficiency chlorosis (IDC). Each variety was planted in a hill plot consisting of five seeds per hill, with four replications per variety, at two high pH field locations. Notes were taken for IDC symptoms at each location approximately four weeks after planting and again at five weeks after planting. Varieties were rated on a scale of “1” to “5” with a “1” indicating no symptoms of IDC present and a “5” indicating plant death due to IDC. The scores from each location were averaged together and an overall rating was assigned to each variety. One variety highly resistant to IDC and one variety susceptible to IDC also were included in the experiments as checks. The highly resistant variety scored an average of 1.6 and the susceptible variety scored an average of 2.9. The scores from these IDC field tests are listed in each location table in the report for reference.

Location Initial SCN Population

(eggs / 100 cc soil) HG Type1 Planting Date Harvest Date

Newell (NW) 4,894 2.5.7 May 22nd October 8th Manly (NC) 11,992 2.7 May 13th October 6th Lawler (NE) 1,763 2.5.7 May 20th October 13th Moorhead (WC) 769 2.5.7 May 27th October 15th Ames (C) 5,016 2.5.7 May 21st October 14th Urbana (EC) 760 2.7 May 19th October 7th Glenwood (SW) 1,902 2.5.7 May 28th October 16th Oskaloosa (SC) 6,208 2.5.7 May 18th October 5th Fruitland (SE) 6,082 2.5.7 May 12th October 12th

3

Evaluation of Soybean Varieties Resistant to Soybean Cyst Nematode in Iowa in 2015

Gregory L. Tylka, Gregory D. Gebhart,

Christopher C. Marett, and Mark P. Mullaney Department of Plant Pathology and Microbiology

Introduction

Use of resistant soybean varieties is a very effective strategy for managing soybean cyst nematode (SCN), and numerous SCN-resistant soybean varieties are available for Iowa soybean farmers. Each year, public and private SCN-resistant soybean varieties are evaluated in SCN-infested fields throughout Iowa by Iowa State University personnel. The research described in this report was performed to assess the agronomic performance of maturity group (MG) I, II, and III SCN-resistant soybean varieties and to determine the effects of the varieties on SCN numbers or population densities.

Materials and Methods

In the northern Iowa district, 51 glyphosate-resistant, SCN-resistant soybean varieties were evaluated using Roundup® herbicide, and 11 non-glyphosate-resistant (six LibertyLink® and five conventional), SCN-resistant soybean varieties were evaluated using conventional herbicides. The northern Iowa experiments were conducted near Newell (northwest Iowa), Manly (north central Iowa), and Lawler (northeast Iowa). In the central Iowa district, 51 glyphosate-resistant, SCN-resistant soybean varieties were evaluated using Roundup® herbicide and 13 non-glyphosate-resistant (eight LibertyLink® and five conventional), SCN-resistant soybean varieties were evaluated using conventional herbicides. The central Iowa experiments were conducted near Moorhead (west central Iowa), Ames (central Iowa), and Urbana (east central Iowa). In the southern Iowa district, 51 glyphosate-resistant, SCN-resistant soybean varieties were evaluated using Roundup® herbicide and ten non-glyphosate-resistant (eight LibertyLink® and two conventional), SCN-resistant soybean varieties were evaluated using conventional herbicides. The southern Iowa experiments were conducted near Glenwood (southwest Iowa), Oskaloosa (south central Iowa), and Fruitland (southeast Iowa).

Location-specific details.

1 In the SCN HG type test results, “2” indicates >10% reproduction on PI 88788, “5” indicates >10% reproduction on PI 209332, and “7” indicates >10% reproduction on PI 548316.

SCN-susceptible varieties also were planted in the experiments for comparison purposes. All plots were four 17-foot-long rows spaced 30 inches apart and were planted at 10 seeds per foot, with four replications per variety. Seed companies were encourage to treat their seed with fungicide and insecticide. Seeds that were received untreated were treated with CruiserMaxx® by Iowa State University personnel. A complete treatment list is included at the end of the report. Preplant herbicide was applied to each location. The Lawler location was planted using “no-till” methods, and both the Fruitland and Moorhead locations were minimally tilled. At all other locations, the seed bed was tilled prior to planting. At growth stage R6 all locations were scouted for Sudden Death Syndrome (SDS). The Oskaloosa site was found to have SDS so the plots were rated for the disease using the Southern Illinois University method of SDS scoring (0 = no disease, 100 = all plants prematurely dead). Further details of this rating technique may be found at www.scnresearch.info/462.pdf. All plots were end trimmed to a length of 14 feet during September. Maturity notes were taken at one location in each district, but for reference purposes, maturity dates are listed in the tables for all three locations in the same district. Maturity was recorded as the number of days after August 31st that a variety was considered mature. A variety was considered mature when 95 percent of the pods had turned brown. For all locations, just prior to harvest, average plant height and lodging (1 = all plants fully erect, 5 = all plants flat) were assessed in each plot. For each location, the center two rows of each four-row plot were harvested with a plot combine, total seed weight per plot and seed moisture were determined, and total plot seed weights subsequently were converted to bushels per acre. Resistant varieties and susceptible check varieties are grouped separately and are listed in the report in order of descending yield.

At the beginning of the growing season, plots were sampled for the presence of SCN. Soil samples, consisting of 10 one-inch-diameter, six- to eight-inch-deep soil cores were collected from the center 14 feet of the center two rows of each plot immediately after planting. SCN cysts were extracted from each soil sample, and SCN eggs were extracted from the cysts and counted. SCN egg population densities also were determined for each plot at the end of the growing season in an identical manner. Because of the consistent relationship between higher soil pH and SCN population densities, all varieties also were field tested for tolerance to iron deficiency chlorosis (IDC). Each variety was planted in a hill plot consisting of five seeds per hill, with four replications per variety, at two high pH field locations. Notes were taken for IDC symptoms at each location approximately four weeks after planting and again at five weeks after planting. Varieties were rated on a scale of “1” to “5” with a “1” indicating no symptoms of IDC present and a “5” indicating plant death due to IDC. The scores from each location were averaged together and an overall rating was assigned to each variety. One variety highly resistant to IDC and one variety susceptible to IDC also were included in the experiments as checks. The highly resistant variety scored an average of 1.6 and the susceptible variety scored an average of 2.9. The scores from these IDC field tests are listed in each location table in the report for reference.

Location Initial SCN Population

(eggs / 100 cc soil) HG Type1 Planting Date Harvest Date

Newell (NW) 4,894 2.5.7 May 22nd October 8th Manly (NC) 11,992 2.7 May 13th October 6th Lawler (NE) 1,763 2.5.7 May 20th October 13th Moorhead (WC) 769 2.5.7 May 27th October 15th Ames (C) 5,016 2.5.7 May 21st October 14th Urbana (EC) 760 2.7 May 19th October 7th Glenwood (SW) 1,902 2.5.7 May 28th October 16th Oskaloosa (SC) 6,208 2.5.7 May 18th October 5th Fruitland (SE) 6,082 2.5.7 May 12th October 12th

4

Data Presentation

In the report, soybean yield and SCN reproduction are displayed graphically in addition to in the tables. In the graphs, yield is represented by the length of the gray bars. SCN reproduction is represented by the length of the blue section of the bars. SCN reproduction was calculated by determining the reproductive factor (RF) for each variety. RF is calculated by dividing the average final SCN population density by the average initial SCN population density for each variety. What this means is that if a variety has an RF value of 5.0, the SCN population density for those plots was 5 times greater at harvest than it was at planting. Conversely, an RF value of 0.5 means the SCN population density for those plots at harvest was one half the population density at planting. It is important to remember that this number is location specific and may vary substantially under different environmental conditions, soil types, and nematode populations.

Summary

The results of the experiments illustrate the benefits of growing SCN-resistant soybean varieties for management of this important soybean pest. At locations with the most significant SCN reproduction, many of the soybean varieties with SCN resistance had greater yields than susceptible varieties, although some resistant varieties had greater yields than others. At most locations, end-of-season SCN population densities were significantly greater in plots where susceptible varieties were grown relative to plots planted with resistant varieties. Nematode control is an extremely important aspect of growing SCN-resistant soybean varieties that must be considered when selecting soybean varieties. Growing soybean varieties in SCN-infested fields in an attempt to maximize soybean yields in the short term without any consideration of the effect of the varieties on SCN population densities will seriously reduce the long-term soybean productivity of the land.

The results of these experiments illustrate that SCN-resistant varieties can suppress SCN reproduction and provide increased soybean yields relative to using susceptible varieties. Currently, there are three main genetic sources for SCN resistance genes in commercial soybean varieties, namely PI 88788, Peking, and PI 437654 (also known as Hartwig). Each of these sources of SCN resistance contains several genes that confer resistance to the nematode. Consequently, soybean varieties developed from the various sources of resistance may not all contain the same genes in the same combinations. All of these sources of SCN resistance allow some limited reproduction of soybean cyst nematodes. Resistant varieties must be used in an integrated management program, along with the use of nonhost crops and scouting for early detection of SCN, to maximize yields and minimize reproduction of the pest on a long-term basis.

The data presented in this report are from a limited number of locations and should be used only as a beginning point for developing a SCN management program for any specific field. Performance of individual SCN-resistant soybean varieties in SCN-infested fields will vary among locations and years. Growers are encouraged to evaluate several SCN-resistant soybean varieties at their own locations to determine the best varieties for their local conditions.

Acknowledgments

This research was supported by soybean checkoff funds through a grant from the Iowa Soybean Association. Appreciation is expressed to the staff of the Iowa State University Research and Demonstration Farms. Gratitude also is expressed to Kermit Grote of Newell, Randy and Jess Lutz of Mason City, Donnie Blazek of Lawler, John Melby of Moorhead, Ed McKinley of Urbana, Matt Biermann of Glenwood, Mark Groenendyk of Oskaloosa, and Ron Shepard of Fruitland for use of land for some of the experiments. Funded, in part, by the soybean checkoff through a grant from the Iowa Soybean Association and also by the Iowa Agriculture and Home Economics Experiment Station.

5

Data Presentation

In the report, soybean yield and SCN reproduction are displayed graphically in addition to in the tables. In the graphs, yield is represented by the length of the gray bars. SCN reproduction is represented by the length of the blue section of the bars. SCN reproduction was calculated by determining the reproductive factor (RF) for each variety. RF is calculated by dividing the average final SCN population density by the average initial SCN population density for each variety. What this means is that if a variety has an RF value of 5.0, the SCN population density for those plots was 5 times greater at harvest than it was at planting. Conversely, an RF value of 0.5 means the SCN population density for those plots at harvest was one half the population density at planting. It is important to remember that this number is location specific and may vary substantially under different environmental conditions, soil types, and nematode populations.

Summary

The results of the experiments illustrate the benefits of growing SCN-resistant soybean varieties for management of this important soybean pest. At locations with the most significant SCN reproduction, many of the soybean varieties with SCN resistance had greater yields than susceptible varieties, although some resistant varieties had greater yields than others. At most locations, end-of-season SCN population densities were significantly greater in plots where susceptible varieties were grown relative to plots planted with resistant varieties. Nematode control is an extremely important aspect of growing SCN-resistant soybean varieties that must be considered when selecting soybean varieties. Growing soybean varieties in SCN-infested fields in an attempt to maximize soybean yields in the short term without any consideration of the effect of the varieties on SCN population densities will seriously reduce the long-term soybean productivity of the land.

The results of these experiments illustrate that SCN-resistant varieties can suppress SCN reproduction and provide increased soybean yields relative to using susceptible varieties. Currently, there are three main genetic sources for SCN resistance genes in commercial soybean varieties, namely PI 88788, Peking, and PI 437654 (also known as Hartwig). Each of these sources of SCN resistance contains several genes that confer resistance to the nematode. Consequently, soybean varieties developed from the various sources of resistance may not all contain the same genes in the same combinations. All of these sources of SCN resistance allow some limited reproduction of soybean cyst nematodes. Resistant varieties must be used in an integrated management program, along with the use of nonhost crops and scouting for early detection of SCN, to maximize yields and minimize reproduction of the pest on a long-term basis.

The data presented in this report are from a limited number of locations and should be used only as a beginning point for developing a SCN management program for any specific field. Performance of individual SCN-resistant soybean varieties in SCN-infested fields will vary among locations and years. Growers are encouraged to evaluate several SCN-resistant soybean varieties at their own locations to determine the best varieties for their local conditions.

Acknowledgments

This research was supported by soybean checkoff funds through a grant from the Iowa Soybean Association. Appreciation is expressed to the staff of the Iowa State University Research and Demonstration Farms. Gratitude also is expressed to Kermit Grote of Newell, Randy and Jess Lutz of Mason City, Donnie Blazek of Lawler, John Melby of Moorhead, Ed McKinley of Urbana, Matt Biermann of Glenwood, Mark Groenendyk of Oskaloosa, and Ron Shepard of Fruitland for use of land for some of the experiments. Funded, in part, by the soybean checkoff through a grant from the Iowa Soybean Association and also by the Iowa Agriculture and Home Economics Experiment Station.

Table 1. Newell (NW Iowa) Glyphosate-resistant.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

ASGROW AG2035 2.0 PI 88788 1.6 27 40.5 2.0 74.1 1 3,300 0.6Dyna-Gro S23RY85 2.3 PI 88788 2.3 27 42.3 2.5 72.8 2 2,075 0.5LG Seeds C2441R2 2.4 PI 88788 2.0 28 42.0 2.0 72.8 2 2,450 0.5Champion 20R35N 2.0 PI 88788 1.9 27 41.5 2.5 72.7 4 3,375 0.8Prairie Brand PB-2486R2 2.4 PI 88788 1.6 29 44.3 2.5 71.4 5 1,975 0.5LATHAM L2128R2 2.1 PI 88788 2.1 30 42.0 2.3 71.3 6 1,675 0.5Kruger Seeds K2-2103 2.1 PI 88788 1.9 26 41.3 2.4 70.9 7 2,525 1.1GLH 2039R2 2.0 PI 88788 2.0 26 43.8 2.8 70.7 8 2,175 0.6FS HiSOY HS 19A50 1.9 PI 88788 2.2 25 38.3 1.4 70.5 9 1,825 0.4Pioneer P22T61R 2.2 PI 88788 1.8 26 40.3 2.3 70.4 10 1,825 0.6NK S21-M7 2.1 PI 88788 1.6 27 38.0 2.0 70.4 10 2,150 0.6NK S20-T6 2.0 PI 88788 1.7 25 38.8 1.5 70.2 12 4,175 1.3ASGROW AG1935 1.9 PI 88788 2.1 26 43.3 2.8 70.1 13 3,225 0.4FS HiSOY HS 21A50 2.1 PI 88788 1.5 28 45.0 2.5 70.0 14 3,125 0.5Legacy Seeds LS1934N RR2 1.9 PI 88788 1.8 25 39.0 1.3 69.9 15 2,450 0.5LATHAM L2228R2 2.2 PI 88788 1.8 28 40.3 2.1 69.8 16 1,900 0.6ASGROW AG2136 2.1 PI 88788 1.8 28 42.5 2.6 69.6 17 2,625 0.9Stine 17RF26 1.7 PI 88788 1.7 23 41.3 2.0 69.0 18 1,275 0.3Federal Hybrids F226NRR2Y 2.2 PI 88788 2.0 28 45.5 2.6 69.0 18 1,900 0.5Jacobsen 740NR2 2.0 PI 88788 1.8 27 41.0 2.0 69.0 18 2,150 0.4NuTech Seed 7169 G2 Genetics 1.6 PI 88788 1.7 23 36.5 1.4 68.9 21 1,200 0.2Prairie Brand PB-2296R2 2.2 PI 88788 2.3 28 47.0 2.6 68.8 22 2,300 0.5Mycogen 5N206R2 2.0 PI 88788 2.1 26 39.8 1.8 68.6 23 1,500 0.3NK S17-B3 1.7 PI 88788 2.6 25 39.0 2.0 68.2 25 4,675 1.1Dairyland Seed DSR-1721/R2Y 1.7 PI 88788 1.7 22 39.5 1.9 68.1 26 2,800 0.7Stine 19RF32 1.9 PI 88788 2.6 25 40.0 1.6 68.1 26 3,050 0.8Dyna-Gro 20RY45 2.0 PI 88788 1.9 26 41.0 2.8 68.1 26 2,425 0.7Prairie Brand PB-2156R2 2.1 PI 88788 2.0 29 46.5 2.8 68.0 29 1,675 0.5Dairyland Seed DSR-2110/R2Y 2.1 PI 88788 1.7 29 40.3 1.9 67.9 30 3,350 1.0Beck 233R4 2.3 Peking 2.1 29 41.5 2.0 67.8 31 1,575 0.4Beck 187R4 1.8 Peking 1.6 24 37.3 1.6 67.8 31 875 0.2Stine 22RF22 2.2 Peking 1.5 28 42.0 1.8 67.6 33 1,125 0.3Cornelius CB20R14 2.0 PI 88788 1.8 27 40.8 2.6 67.2 34 2,325 0.5FS HiSOY HS 23A42 2.3 PI 88788 2.0 26 42.0 2.3 67.2 34 2,675 0.6Pioneer P22T41R2 2.2 Peking 1.9 28 39.8 1.5 67.1 36 2,450 0.5Dairyland Seed DSR-2330/R2Y 2.3 PI 88788 1.6 29 42.3 2.1 67.0 37 1,675 0.5Wensman Seed W3201NR2 2.0 PI 88788 2.2 26 42.8 2.3 66.9 38 2,000 0.4Jacobsen 752NR2 2.2 PI 88788 2.4 27 43.8 2.1 66.7 39 1,675 0.3Pioneer P22T69R 2.2 Peking 2.0 28 37.5 1.5 66.7 39 725 0.2Champion 21R66N 2.1 PI 88788 1.8 29 41.8 2.1 66.6 41 2,525 0.5NK S18-C2 1.8 PI 88788 1.6 23 41.0 2.9 66.4 42 2,575 0.5Mycogen 5N207R2 2.0 PI 88788 1.7 27 41.8 2.4 66.1 44 1,975 0.5NuTech Seed 7172R2 G2 Genetics 1.7 PI 88788 1.3 24 38.3 2.0 66.0 45 3,025 0.6LG Seeds C2020R2 2.0 PI 88788 2.0 26 40.0 2.5 65.9 46 2,000 0.3Kruger Seeds K2-2305 2.3 PI 88788 1.7 28 44.5 2.4 65.1 47 2,450 0.6Curry 1225 2.2 PI 88788 1.8 26 38.8 1.6 64.4 48 3,275 0.8ASGROW AG2336 2.3 PI 88788 2.6 29 41.0 1.9 64.3 49 3,350 0.5Federal Hybrids F235NRR2Y 2.3 PI 88788 2.4 27 43.0 2.6 63.6 50 725 0.3Hoegemeyer HPT 2250NR 2.2 PI 88788 2.0 25 39.3 1.8 63.0 51 2,625 0.6Curry 1183 1.8 PI 88788 1.8 21 36.5 2.0 59.9 53 2,400 0.6Merschman Apache 1624RR2 2.4 PI 88788 2.6 29 42.5 2.3 59.2 54 2,125 0.3

Mean 2.1 - 1.9 27 41.2 2.1 68.1 - 2,300 0.5LSD3 (P = 0.10) - - - - 2.9 0.5 4.5 - NS -

NK S24-K2 2.4 None 2.0 28 41.8 2.3 68.6 23 4,975 1.2Asgrow AG2431 2.4 None 2.5 29 39.5 1.9 66.3 43 4,450 1.5Pioneer 92Y12 2.1 None 2.2 24 39.3 1.6 63.0 51 2,400 0.6

Mean 2.3 - 2.2 27 40.2 1.9 66.0 - 3,942 1.1Values presented in tables are means. Entries are listed in decreasing order of yield. Italicized entries are widely available SCN-susceptible varieties entered by Iowa State University for comparison purposes. 1 Final SCN egg population density (eggs per 100 cc soil); there were no significant differences among initial SCN population densities; initial SCN population 4,352 eggs per 100 cc soil; HG Type 2.5.7 (22% on PI 88788, 4% on Peking). 2 Average final SCN egg population density / average initial SCN egg population density. 3 Least significant difference: values are from Fisher's least significant difference test, NS = no significant differences among the varieties.

6

Figure 1. Newell (NW Iowa) Glyphosate-resistant.

- Average initial SCN population density 4,352 eggs per 100 cc soil.- HG Type 2.5.7 (22% on PI 88788, 4% on Peking).- RF 1.0 = no change in SCN population density over growing season.

Yield (bu/acre) SCN Reproduction (RF)

0 10 20 30 40 50 60 70 80

ASGROW AG2035Dyna-Gro S23RY85LG Seeds C2441R2Champion 20R35N

Prairie Brand PB-2486R2LATHAM L2128R2

Kruger Seeds K2-2103GLH 2039R2

FS HiSOY HS 19A50Pioneer P22T61R

NK S21-M7NK S20-T6

ASGROW AG1935FS HiSOY HS 21A50

Legacy Seeds LS1934N RR2LATHAM L2228R2ASGROW AG2136

Stine 17RF26Federal Hybrids F226NRR2Y

Jacobsen 740NR2NuTech Seed 7169 G2 Genetics

Prairie Brand PB-2296R2Mycogen 5N206R2

NK S17-B3Dairyland Seed DSR-1721/R2Y

Stine 19RF32Dyna-Gro 20RY45

Prairie Brand PB-2156R2Dairyland Seed DSR-2110/R2Y

Beck 233R4Beck 187R4

Stine 22RF22Cornelius CB20R14

FS HiSOY HS 23A42Pioneer P22T41R2

Dairyland Seed DSR-2330/R2YWensman Seed W3201NR2

Jacobsen 752NR2Pioneer P22T69R

Champion 21R66NNK S18-C2

Mycogen 5N207R2NuTech Seed 7172R2 G2 Genetics

LG Seeds C2020R2Kruger Seeds K2-2305

Curry 1225ASGROW AG2336

Federal Hybrids F235NRR2YHoegemeyer HPT 2250NR

Curry 1183Merschman Apache 1624RR2

NK S24-K2

Asgrow AG2431Pioneer 92Y12

Susceptible Check Varieties

7

Table 2. Newell (NW Iowa) Conventional.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

Hoegemeyer HPT LL2316N 2.3 PI 88788 2.7 29 36.8 1.8 66.3 1 2,850 0.4Merschman Munsee 1620LL 2.0 PI 88788 2.0 27 37.5 1.9 65.1 2 2,200 0.3NuTech Seed 3205L 2.0 PI 88788 2.3 27 35.8 1.5 64.9 3 2,375 0.3Beck 234L4 2.3 PI 88788 1.8 29 38.8 1.5 63.7 4 2,400 0.3eMerge e1993 1.9 PI 88788 1.9 24 35.3 1.4 63.5 5 2,450 0.5Merschman Chippewa 1523LL 2.3 PI 88788 2.1 30 38.0 1.5 61.7 7 3,000 0.5Iowa State University AR12-127092 1.9 PI 507354 / PI 88788 2.4 26 39.8 2.0 61.6 8 3,625 0.5LATHAM L2186L 2.1 PI 88788 2.5 27 34.8 1.5 61.1 9 2,825 0.3Iowa State University IAR1902 SCN 1.9 Peking 2.0 26 41.5 2.0 60.4 10 750 0.1eMerge e2282 2.2 PI 88788 2.0 29 39.0 1.8 59.3 11 1,550 0.3eMerge e2162 2.1 PI 88788 1.9 23 34.5 1.9 55.0 13 4,825 0.5

Mean 2.1 - 2.1 27 37.4 1.7 62.1 - 2,623 0.4LSD3 (P = 0.10) - - - - 2.7 0.3 4.7 - NS -

Asgrow AG2431 2.4 None 2.5 29 35.5 1.5 63.1 6 2,825 0.5Pioneer 92Y12 2.1 None 2.2 25 36.0 1.4 57.6 12 3,725 0.4NK S24-K2 2.4 None 2.0 31 33.0 1.4 52.8 14 5,250 0.9

Mean 2.3 - 2.2 28.33 34.8 1.4 57.8 - 3,933 0.6

Figure 2. Newell (NW Iowa) Conventional.

Values presented in tables are means. Entries are listed in decreasing order of yield. Italicized entries are widely available SCN-susceptible varieties entered by Iowa State University for comparison purposes. 1 Final SCN egg population density (eggs per 100 cc soil); there were no significant differences among initial SCN population densities; initial SCN population 6,845 eggs per 100 cc soil; HG Type 2.5.7 (22% on PI 88788, 4% on Peking). 2 Average final SCN egg population density / average initial SCN egg population density. 3 Least significant difference: values are from Fisher's least significant difference test, NS = no significant differences among the varieties.

0 10 20 30 40 50 60 70

Hoegemeyer HPT LL2316NMerschman Munsee 1620LL

NuTech Seed 3205LBeck 234L4

eMerge e1993Merschman Chippewa 1523LL

Iowa State University AR12-127092LATHAM L2186L

Iowa State University IAR1902 SCNeMerge e2282eMerge e2162

Asgrow AG2431

Pioneer 92Y12NK S24-K2




8

Table 3. Manly (NC Iowa) Glyphosate-resistant.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

Legacy Seeds LS1934N RR2 1.9 PI 88788 1.8 25 33.8 1.1 71.7 1 1,625 0.2Dyna-Gro S23RY85 2.3 PI 88788 2.3 27 38.3 1.6 71.6 2 1,975 0.3FS HiSOY HS 21A50 2.1 PI 88788 1.5 28 40.8 2.0 71.1 3 2,950 0.3Jacobsen 740NR2 2.0 PI 88788 1.8 27 35.0 1.5 71.1 3 2,350 0.3LG Seeds C2441R2 2.4 PI 88788 2.0 28 36.0 1.4 70.8 5 2,075 0.2Mycogen 5N206R2 2.0 PI 88788 2.1 26 35.8 1.3 70.6 6 2,025 0.2ASGROW AG2035 2.0 PI 88788 1.6 27 36.5 1.5 70.5 7 2,050 0.2ASGROW AG1935 1.9 PI 88788 2.1 26 36.3 1.5 70.4 8 1,700 0.1Dyna-Gro 20RY45 2.0 PI 88788 1.9 26 36.3 1.5 70.0 9 2,075 0.1Stine 19RF32 1.9 PI 88788 2.6 25 34.3 1.5 69.5 10 1,675 0.2LATHAM L2228R2 2.2 PI 88788 1.8 28 35.8 1.5 69.5 10 2,025 0.3Wensman Seed W3201NR2 2.0 PI 88788 2.2 26 37.0 1.8 69.4 12 2,900 0.2Champion 20R35N 2.0 PI 88788 1.9 27 36.3 1.6 69.2 13 2,475 0.2NK S17-B3 1.7 PI 88788 2.6 25 34.0 1.6 69.0 14 3,525 0.4Mycogen 5N207R2 2.0 PI 88788 1.7 27 35.8 1.8 68.5 15 2,150 0.2Cornelius CB20R14 2.0 PI 88788 1.8 27 34.0 1.5 68.4 16 3,075 0.3LG Seeds C2020R2 2.0 PI 88788 2.0 26 35.5 1.6 68.3 17 3,875 0.4Prairie Brand PB-2296R2 2.2 PI 88788 2.3 28 38.8 1.6 68.0 18 2,850 0.5Prairie Brand PB-2156R2 2.1 PI 88788 2.0 29 39.3 1.9 67.7 19 2,050 0.3Prairie Brand PB-2486R2 2.4 PI 88788 1.6 29 35.8 1.6 67.6 20 3,225 0.4GLH 2039R2 2.0 PI 88788 2.0 26 37.0 1.9 67.6 20 2,725 0.3FS HiSOY HS 19A50 1.9 PI 88788 2.2 25 33.3 1.4 67.5 22 1,950 0.3ASGROW AG2336 2.3 PI 88788 2.6 29 36.5 1.5 67.5 22 2,267 0.2FS HiSOY HS 23A42 2.3 PI 88788 2.0 26 34.5 1.3 67.4 24 2,825 0.2ASGROW AG2136 2.1 PI 88788 1.8 28 37.0 1.6 67.4 24 3,675 0.4Curry 1225 2.2 PI 88788 1.8 26 34.8 1.5 67.0 26 1,875 0.2Dairyland Seed DSR-2330/R2Y 2.3 PI 88788 1.6 29 36.3 1.6 66.8 27 2,375 0.2Pioneer P22T69R 2.2 Peking 2.0 28 34.3 1.6 66.7 28 1,275 0.2NK S21-M7 2.1 PI 88788 1.6 27 31.3 1.8 66.7 28 2,025 0.2Federal Hybrids F226NRR2Y 2.2 PI 88788 2.0 28 38.0 1.6 66.1 30 2,100 0.2Kruger Seeds K2-2103 2.1 PI 88788 1.9 26 33.8 1.6 65.7 31 3,375 0.2NuTech Seed 7169 G2 Genetics 1.6 PI 88788 1.7 23 30.8 1.1 65.5 32 1,250 0.2Stine 22RF22 2.2 Peking 1.5 28 34.3 1.3 65.1 33 2,075 0.3Pioneer P22T61R 2.2 PI 88788 1.8 26 33.8 1.8 65.0 34 2,300 0.3Beck 187R4 1.8 Peking 1.6 24 28.3 1.3 64.6 36 1,000 0.1Jacobsen 752NR2 2.2 PI 88788 2.4 27 37.0 1.8 64.5 37 2,650 0.2Champion 21R66N 2.1 PI 88788 1.8 29 32.8 1.5 64.4 38 2,050 0.2NK S18-C2 1.8 PI 88788 1.6 23 34.8 1.9 64.4 38 2,650 0.2NuTech Seed 7172R2 G2 Genetics 1.7 PI 88788 1.3 24 35.3 2.0 64.2 40 1,425 0.2Beck 233R4 2.3 Peking 2.1 29 37.8 1.6 64.1 41 900 0.1Federal Hybrids F235NRR2Y 2.3 PI 88788 2.4 27 35.5 1.6 63.9 42 2,050 0.2Kruger Seeds K2-2305 2.3 PI 88788 1.7 28 37.8 1.6 63.2 43 2,500 0.3Curry 1183 1.8 PI 88788 1.8 21 31.8 1.0 63.0 44 2,325 0.2Dairyland Seed DSR-2110/R2Y 2.1 PI 88788 1.7 29 30.5 1.6 62.3 45 3,075 0.3LATHAM L2128R2 2.1 PI 88788 2.1 30 31.5 1.4 62.0 46 3,000 0.3Merschman Apache 1624RR2 2.4 PI 88788 2.6 29 32.3 1.5 61.2 47 4,175 0.3Pioneer P22T41R2 2.2 Peking 1.9 28 32.3 1.1 61.1 48 2,725 0.3NK S20-T6 2.0 PI 88788 1.7 25 30.5 1.5 60.3 49 4,400 0.4Hoegemeyer HPT 2250NR 2.2 PI 88788 2.0 25 35.3 1.5 59.6 51 2,400 0.2Dairyland Seed DSR-1721/R2Y 1.7 PI 88788 1.7 22 35.0 1.5 59.6 51 2,475 0.2Stine 17RF26 1.7 PI 88788 1.7 23 34.0 1.5 53.8 54 2,700 0.2

Mean 2.1 - 1.9 27 35.0 1.5 66.3 - 2,417 0.2LSD3 (P = 0.10) - - - - 2.7 0.3 5.2 - 1,445 -

Asgrow AG2431 2.4 None 2.5 29 34.3 1.5 64.7 35 3,725 0.4Pioneer 92Y12 2.1 None 2.2 24 32.0 1.4 60.2 50 2,750 0.2NK S24-K2 2.4 None 2.0 28 34.5 1.8 58.0 53 6,950 0.7

Mean 2.3 - 2.2 27 33.6 1.6 61.0 - 4,475 0.4Values presented in tables are means. Entries are listed in decreasing order of yield. Italicized entries are widely available SCN-susceptible varieties entered by Iowa State University for comparison purposes. 1 Final SCN egg population density (eggs per 100 cc soil); there were no significant differences among initial SCN population densities; initial SCN population 10,220 eggs per 100 cc soil; HG Type 2.7 (19% on PI 88788, 1% on Peking). 2 Average final SCN egg population density / average initial SCN egg population density. 3 Least significant difference: values are from Fisher's least significant difference test, NS = no significant differences among the varieties.

9

Figure 3. Manly (NC Iowa) Glyphosate-resistant.

0 10 20 30 40 50 60 70 80

Legacy Seeds LS1934N RR2Dyna-Gro S23RY85

FS HiSOY HS 21A50Jacobsen 740NR2

LG Seeds C2441R2Mycogen 5N206R2ASGROW AG2035ASGROW AG1935Dyna-Gro 20RY45

Stine 19RF32LATHAM L2228R2

Wensman Seed W3201NR2Champion 20R35N

NK S17-B3Mycogen 5N207R2

Cornelius CB20R14LG Seeds C2020R2

Prairie Brand PB-2296R2Prairie Brand PB-2156R2Prairie Brand PB-2486R2

GLH 2039R2FS HiSOY HS 19A50


ASGROW AG2136Curry 1225

Dairyland Seed DSR-2330/R2YPioneer P22T69R

NK S21-M7Federal Hybrids F226NRR2Y

Kruger Seeds K2-2103NuTech Seed 7169 G2 Genetics

Stine 22RF22Pioneer P22T61R

Beck 187R4Jacobsen 752NR2

Champion 21R66NNK S18-C2

NuTech Seed 7172R2 G2 GeneticsBeck 233R4

Federal Hybrids F235NRR2YKruger Seeds K2-2305

Curry 1183Dairyland Seed DSR-2110/R2Y

LATHAM L2128R2Merschman Apache 1624RR2

Pioneer P22T41R2NK S20-T6

Hoegemeyer HPT 2250NRDairyland Seed DSR-1721/R2Y

Stine 17RF26

Asgrow AG2431Pioneer 92Y12

NK S24-K2

- Average initial SCN population density 10,220 eggs per 100 cc soil.- HG Type 2.7 (19% on PI 88788, 1% on Peking).- RF 1.0 = no change in SCN population density over growing season.



10

Table 4. Manly (NC Iowa) Conventional.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

Iowa State University IAR1902 SCN 1.9 Peking 2.0 26 38.8 1.6 62.0 1 2,600 0.2Hoegemeyer HPT LL2316N 2.3 PI 88788 2.7 29 31.8 1.6 61.8 2 9,000 0.4Merschman Munsee 1620LL 2.0 PI 88788 2.0 27 32.5 1.6 59.6 3 7,750 0.6Beck 234L4 2.3 PI 88788 1.8 29 32.3 1.5 59.5 4 8,775 0.5eMerge e2162 2.1 PI 88788 1.9 23 30.8 1.5 57.2 6 4,825 0.2LATHAM L2186L 2.1 PI 88788 2.5 27 29.5 1.4 57.0 7 4,475 0.3Iowa State University AR12-127092 1.9 PI 507354 / PI 88788 2.4 26 33.0 1.9 56.1 8 5,475 0.2NuTech Seed 3205L 2.0 PI 88788 2.3 27 29.5 1.4 55.4 10 5,925 0.3eMerge e2282 2.2 PI 88788 2.0 29 31.3 1.1 55.2 11 5,800 0.3Merschman Chippewa 1523LL 2.3 PI 88788 2.1 30 31.8 1.3 55.0 12 8,775 0.5eMerge e1993 1.9 PI 88788 1.9 24 28.8 1.0 51.7 14 7,125 0.3

Mean 2.1 - 2.1 27 31.8 1.4 57.3 - 6,411 0.3LSD3 (P = 0.10) - - - - 2.6 0.3 4.6 - NS -

NK S24-K2 2.4 None 2.0 31 32.5 1.4 58.3 5 10,825 0.6Asgrow AG2431 2.4 None 2.5 29 29.5 1.6 55.6 9 7,400 0.4Pioneer 92Y12 2.1 None 2.2 25 28.8 1.4 51.9 13 4,375 0.2

Mean 2.3 - 2.2 28 30.3 1.5 55.3 - 7,533 0.4

Figure 4. Manly (NC Iowa) Conventional.

Values presented in tables are means. Entries are listed in decreasing order of yield. Italicized entries are widely available SCN-susceptible varieties entered by Iowa State University for comparison purposes. 1 Final SCN egg population density (eggs per 100 cc soil); there were no significant differences among initial SCN population densities; initial SCN population 18,370 eggs per 100 cc soil; HG Type 2.7 (19% on PI 88788, 1% on Peking). 2 Average final SCN egg population density / average initial SCN egg population density. 3 Least significant difference: values are from Fisher's least significant difference test, NS = no significant differences among the varieties.

0 10 20 30 40 50 60 70

Iowa State University IAR1902 SCNHoegemeyer HPT LL2316N

Merschman Munsee 1620LLBeck 234L4

eMerge e2162LATHAM L2186L

Iowa State University AR12-127092NuTech Seed 3205L

eMerge e2282Merschman Chippewa 1523LL

eMerge e1993

NK S24-K2Asgrow AG2431

Pioneer 92Y12



- Average initial SCN population density 18,370 eggs per 100 cc soil.- HG Type 2.7 (19% on PI 88788, 1% on Peking).- RF 1.0 = no change in SCN population density over growing season.

11

Table 5. Lawler (NE Iowa) Glyphosate-resistant.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

Stine 22RF22 2.2 Peking 1.5 28 34.3 1.5 56.2 1 3,000 2.7LATHAM L2128R2 2.1 PI 88788 2.1 30 35.3 1.8 56.2 1 3,225 2.5Pioneer P22T41R2 2.2 Peking 1.9 28 34.8 1.5 56.2 1 2,800 1.4Dairyland Seed DSR-2110/R2Y 2.1 PI 88788 1.7 29 35.0 1.8 56.1 4 1,125 1.9Dairyland Seed DSR-2330/R2Y 2.3 PI 88788 1.6 29 37.3 1.6 56.0 5 1,900 1.1LATHAM L2228R2 2.2 PI 88788 1.8 28 37.5 2.0 55.9 6 2,675 1.5Prairie Brand PB-2296R2 2.2 PI 88788 2.3 28 39.0 1.8 55.2 7 2,200 1.1Jacobsen 740NR2 2.0 PI 88788 1.8 27 37.3 1.6 55.2 7 4,875 2.7Champion 21R66N 2.1 PI 88788 1.8 29 36.0 1.8 55.1 9 3,200 0.8Legacy Seeds LS1934N RR2 1.9 PI 88788 1.8 25 34.8 1.4 55.0 10 1,375 0.9Jacobsen 752NR2 2.2 PI 88788 2.4 27 37.3 1.6 54.8 11 3,975 1.3Hoegemeyer HPT 2250NR 2.2 PI 88788 2.0 25 35.5 1.4 54.7 12 1,375 0.8ASGROW AG2035 2.0 PI 88788 1.6 27 36.5 1.8 54.6 13 3,050 1.2NK S21-M7 2.1 PI 88788 1.6 27 33.0 1.8 54.5 14 1,950 1.0Dyna-Gro S23RY85 2.3 PI 88788 2.3 27 37.8 1.6 54.4 15 1,875 2.5Kruger Seeds K2-2305 2.3 PI 88788 1.7 28 36.0 1.5 54.2 16 2,225 1.1ASGROW AG1935 1.9 PI 88788 2.1 26 37.8 1.6 54.2 16 2,125 1.2ASGROW AG2136 2.1 PI 88788 1.8 28 38.5 1.5 54.0 18 3,025 1.6Stine 17RF26 1.7 PI 88788 1.7 23 35.3 1.6 53.9 19 2,100 0.9Pioneer P22T69R 2.2 Peking 2.0 28 32.8 1.4 53.7 20 575 0.5FS HiSOY HS 23A42 2.3 PI 88788 2.0 26 37.0 1.6 53.5 21 2,725 2.4Beck 233R4 2.3 Peking 2.1 29 35.0 1.6 53.5 21 225 0.2FS HiSOY HS 21A50 2.1 PI 88788 1.5 28 38.8 2.0 53.4 23 2,925 1.9LG Seeds C2441R2 2.4 PI 88788 2.0 28 36.5 1.6 53.1 24 950 1.3ASGROW AG2336 2.3 PI 88788 2.6 29 36.3 1.5 52.7 25 750 0.8Pioneer P22T61R 2.2 PI 88788 1.8 26 33.3 1.5 52.6 26 2,325 1.3FS HiSOY HS 19A50 1.9 PI 88788 2.2 25 33.8 1.3 52.4 27 1,250 0.7Mycogen 5N207R2 2.0 PI 88788 1.7 27 38.3 1.8 52.3 28 4,575 2.1Curry 1225 2.2 PI 88788 1.8 26 33.0 1.4 52.2 29 1,250 1.2Dyna-Gro 20RY45 2.0 PI 88788 1.9 26 37.3 1.5 52.1 30 3,525 1.2LG Seeds C2020R2 2.0 PI 88788 2.0 26 35.3 1.8 52.1 30 1,875 0.8Kruger Seeds K2-2103 2.1 PI 88788 1.9 26 39.0 1.8 51.8 32 1,400 0.9Wensman Seed W3201NR2 2.0 PI 88788 2.2 26 34.8 1.8 51.8 32 3,150 1.1Prairie Brand PB-2156R2 2.1 PI 88788 2.0 29 38.3 1.8 51.7 34 1,500 1.4Prairie Brand PB-2486R2 2.4 PI 88788 1.6 29 34.8 1.8 51.7 34 2,025 1.8Cornelius CB20R14 2.0 PI 88788 1.8 27 36.5 1.6 51.7 34 2,550 1.1Champion 20R35N 2.0 PI 88788 1.9 27 37.0 1.8 51.5 37 2,475 1.5Mycogen 5N206R2 2.0 PI 88788 2.1 26 35.3 1.5 51.3 38 1,675 1.1Merschman Apache 1624RR2 2.4 PI 88788 2.6 29 33.3 1.5 51.1 40 4,775 1.6GLH 2039R2 2.0 PI 88788 2.0 26 36.0 1.6 50.8 42 2,600 1.7Stine 19RF32 1.9 PI 88788 2.6 25 33.3 1.1 50.4 43 2,050 1.6Federal Hybrids F226NRR2Y 2.2 PI 88788 2.0 28 37.8 1.6 50.2 44 1,825 1.3Dairyland Seed DSR-1721/R2Y 1.7 PI 88788 1.7 22 35.8 1.4 49.9 46 2,675 2.4NK S17-B3 1.7 PI 88788 2.6 25 32.0 1.6 49.5 47 5,825 3.6Beck 187R4 1.8 Peking 1.6 24 33.5 1.3 49.1 48 700 0.5Federal Hybrids F235NRR2Y 2.3 PI 88788 2.4 27 33.5 1.4 49.0 49 2,150 1.2NK S20-T6 2.0 PI 88788 1.7 25 31.3 1.5 47.4 50 5,500 6.1Curry 1183 1.8 PI 88788 1.8 21 33.0 1.3 46.8 51 1,275 0.7NuTech Seed 7169 G2 Genetics 1.6 PI 88788 1.7 23 31.3 1.1 46.1 52 575 0.3NuTech Seed 7172R2 G2 Genetics 1.7 PI 88788 1.3 24 34.5 1.8 45.7 53 2,375 1.7NK S18-C2 1.8 PI 88788 1.6 23 33.8 2.0 45.5 54 2,375 2.5

Mean 2.1 - 1.9 27 35.5 1.6 52.4 - 2,363 1.5LSD3 (P = 0.10) - - - - 2.6 0.4 4.0 - 2,984 -

Asgrow AG2431 2.4 None 2.5 29 33.3 1.6 51.3 38 5,525 3.9NK S24-K2 2.4 None 2.0 28 34.5 1.8 51.1 40 9,500 11.5Pioneer 92Y12 2.1 None 2.2 24 33.8 1.4 50.2 44 3,425 2.7


12

Figure 5. Lawler (NE Iowa) Glyphosate-resistant.

0 10 20 30 40 50 60

Stine 22RF22LATHAM L2128R2

Pioneer P22T41R2Dairyland Seed DSR-2110/R2YDairyland Seed DSR-2330/R2Y

LATHAM L2228R2Prairie Brand PB-2296R2

Jacobsen 740NR2Champion 21R66N

Legacy Seeds LS1934N RR2Jacobsen 752NR2

Hoegemeyer HPT 2250NRASGROW AG2035

NK S21-M7Dyna-Gro S23RY85

Kruger Seeds K2-2305ASGROW AG1935ASGROW AG2136

Stine 17RF26Pioneer P22T69R

FS HiSOY HS 23A42Beck 233R4

FS HiSOY HS 21A50LG Seeds C2441R2ASGROW AG2336

Pioneer P22T61RFS HiSOY HS 19A50

Mycogen 5N207R2Curry 1225

Dyna-Gro 20RY45LG Seeds C2020R2

Kruger Seeds K2-2103Wensman Seed W3201NR2

Prairie Brand PB-2156R2Prairie Brand PB-2486R2

Cornelius CB20R14Champion 20R35NMycogen 5N206R2

Merschman Apache 1624RR2GLH 2039R2Stine 19RF32

Federal Hybrids F226NRR2YDairyland Seed DSR-1721/R2Y

NK S17-B3Beck 187R4

Federal Hybrids F235NRR2YNK S20-T6Curry 1183

NuTech Seed 7169 G2 GeneticsNuTech Seed 7172R2 G2 Genetics

NK S18-C2

Asgrow AG2431NK S24-K2

Pioneer 92Y12




13

Table 6. Lawler (NE Iowa) Conventional.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

Merschman Chippewa 1523LL 2.3 PI 88788 2.1 30 38.3 2.1 58.9 1 19,500 14.2LATHAM L2186L 2.1 PI 88788 2.5 27 35.5 1.9 55.6 3 2,200 1.0eMerge e1993 1.9 PI 88788 1.9 24 35.0 1.4 55.4 4 3,350 5.6NuTech Seed 3205L 2.0 PI 88788 2.3 27 36.3 1.5 55.3 5 4,950 2.3Merschman Munsee 1620LL 2.0 PI 88788 2.0 27 37.5 2.4 55.2 6 7,950 11.4Hoegemeyer HPT LL2316N 2.3 PI 88788 2.7 29 36.0 2.3 54.8 7 10,250 4.3Beck 234L4 2.3 PI 88788 1.8 29 36.3 1.9 53.7 8 13,525 4.7eMerge e2282 2.2 PI 88788 2.0 29 35.3 1.6 52.7 9 3,425 1.3Iowa State University AR12-127092 1.9 PI 507354 / PI 88788 2.4 26 41.8 2.1 48.3 12 1,850 1.1Iowa State University IAR1902 SCN 1.9 Peking 2.0 26 40.3 2.0 48.2 13 1,325 0.5eMerge e2162 2.1 PI 88788 1.9 23 33.5 1.9 45.4 14 4,700 2.4

Mean 2.1 - 2.1 27 36.9 1.9 53.0 - 6,639 4.4LSD3 (P = 0.10) - - - - 3.4 NS 6.3 - 5,613 -

Asgrow AG2431 2.4 None 2.5 29 35.5 2.0 56.8 2 11,525 5.8NK S24-K2 2.4 None 2.0 31 34.0 1.8 50.2 10 15,275 4.6Pioneer 92Y12 2.1 None 2.2 25 35.0 1.4 49.6 11 15,200 4.5

Mean 2.3 - 2.2 28.33 34.8 1.7 52.2 - 14,000 5.0

Figure 6. Lawler (NE Iowa) Conventional.


0 10 20 30 40 50 60

Merschman Chippewa 1523LLLATHAM L2186L

eMerge e1993NuTech Seed 3205L

Merschman Munsee 1620LLHoegemeyer HPT LL2316N

Beck 234L4eMerge e2282

Iowa State University AR12-127092Iowa State University IAR1902 SCN

eMerge e2162

Asgrow AG2431NK S24-K2

Pioneer 92Y12




14

Table 7. Moorhead (WC Iowa) Glyphosate-resistant.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

NK S26-P3 2.6 PI 88788 2.4 25 47.0 2.6 73.2 1 75 0.6LG Seeds C2441R2 2.4 PI 88788 1.9 23 44.0 2.5 71.8 2 725 1.1Dairyland Seed DSR-2616/R2Y 2.6 PI 88788 2.3 27 42.0 2.3 70.3 3 2,350 4.1Pioneer P25T51R 2.5 PI 88788 2.0 25 45.3 2.6 69.2 4 450 0.6Dyna-Gro S26RS75 2.6 PI 88788 1.6 24 46.3 2.6 68.3 5 625 3.1Pioneer P24T19R 2.4 PI 88788 1.9 25 45.8 2.5 68.1 6 575 0.7Stine 28RE20 2.8 PI 88788 2.3 29 47.0 2.9 67.9 7 200 0.8Cornelius CB24R82 2.4 PI 88788 1.5 23 47.0 2.5 67.7 8 1,100 1.2Jacobsen 847NR2 2.8 PI 88788 1.9 29 46.5 2.3 67.7 8 1,425 1.4NuTech Seed 7273 G2 Genetics 2.7 PI 88788 1.9 26 45.5 2.0 67.6 10 825 0.9Curry 1246 2.4 PI 88788 2.1 23 46.5 2.0 67.5 11 825 1.1ASGROW AG2935 2.9 PI 88788 2.4 33 48.8 2.8 67.3 12 600 1.0Hoegemeyer HPT 2640NR 2.6 Peking 2.2 26 50.0 1.6 67.1 13 75 0.2ASGROW AG2535 2.5 PI 88788 2.0 25 46.5 3.4 66.4 14 1,050 2.3Beck 297R4 2.9 PI 88788 2.8 29 51.5 2.0 66.0 15 550 1.2ASGROW AG2636 2.6 PI 88788 2.1 30 51.5 2.6 65.9 16 50 0.3Stine 24RH62 2.4 PI 88788 1.6 22 48.5 2.8 65.7 17 925 0.9Mycogen 5N286R2 2.8 PI 88788 1.6 32 49.5 2.5 65.2 18 400 0.6GLH 2551NR2 2.5 PI 88788 1.9 23 48.3 2.6 65.2 18 900 1.0FS HiSOY HS 26A50 2.6 PI 88788 2.0 28 44.0 2.0 64.9 20 800 1.8Champion 28R85N 2.8 PI 88788 1.8 31 49.8 2.4 64.8 21 1,250 1.2Prairie Brand PB-2668R2 2.6 PI 88788 2.2 30 47.3 2.3 64.7 22 825 1.4Federal Hybrids F296NRR2Y 2.9 PI 88788 2.6 31 48.8 2.4 64.3 23 775 0.6ASGROW AG2836 2.8 PI 88788 2.4 29 49.0 2.4 64.1 24 575 0.9Cornelius CB28R58 2.8 PI 88788 1.6 30 48.8 2.4 64.0 25 1,425 1.0Mycogen 5N293R2 2.9 PI 88788 2.8 31 48.5 2.3 63.8 26 675 0.8LATHAM L2884R2 2.8 PI 88788 1.9 32 48.8 3.1 63.5 27 400 1.2Legacy Seeds LS2414N RR2 2.4 PI 88788 2.1 25 46.8 3.1 63.1 28 1,250 1.1Federal Hybrids F245NRR2Y 2.4 PI 88788 1.8 27 45.5 2.0 62.8 29 1,050 0.7Dyna-Gro S29RY46 2.9 PI 88788 2.4 31 46.8 2.4 62.5 30 725 1.5Prairie Brand PB-2600R2 2.6 PI 88788 2.3 28 46.0 2.0 62.2 31 5,400 4.2NK S27-J7 2.7 PI 88788 1.8 29 46.3 3.1 61.9 33 1,550 0.9NuTech Seed 7240 G2 Genetics 2.4 Peking 1.9 25 44.0 3.9 61.8 34 125 0.1NK S28-D3 2.8 PI 88788 2.5 29 43.0 2.5 61.8 34 100 0.1Kruger Seeds K2-2603 2.6 PI 88788 2.0 27 52.5 3.8 61.5 37 1,000 1.3Dairyland Seed DSR-2909/R2Y 2.9 PI 88788 2.3 29 47.8 2.3 61.4 38 2,425 2.7FS HiSOY HS 28A42 2.8 PI 88788 2.3 30 48.5 2.9 60.8 39 1,875 1.9Jacobsen 859NR2 2.9 PI 88788 2.8 32 46.3 2.0 60.8 39 625 0.6LATHAM L2983R2 2.9 PI 88788 2.5 31 47.0 2.3 60.4 41 650 0.9NK S25-L9 2.5 PI 88788 2.6 26 48.0 2.6 60.4 41 1,150 0.9Stine 30RE02 3.0 PI 88788 2.1 31 47.8 2.3 60.1 43 500 2.2Pioneer P92Y53 2.5 Peking 2.4 25 45.8 2.9 60.0 45 425 0.4Curry 1252 2.5 Peking 2.4 26 44.8 2.5 59.7 46 175 0.2Pioneer P92Y75 2.7 PI 88788 2.6 29 50.3 2.1 59.6 47 925 0.7Champion 26R83N 2.6 PI 88788 2.5 27 45.0 2.9 59.3 48 950 0.7Kruger Seeds K2-2905 2.9 Peking 2.2 34 47.3 3.5 59.0 49 150 0.1LG Seeds C2744R2 2.7 PI 88788 2.6 29 47.0 3.5 57.2 50 900 1.1Merschman Arthur 1630RR2 3.0 PI 88788 1.9 33 45.8 2.6 56.9 51 1,050 1.4Hoegemeyer HPT 2913NR 2.9 Peking 2.4 28 49.8 2.9 56.4 52 175 0.3Prairie Brand PB-2686R2 2.6 PI 88788 2.4 23 47.3 3.0 56.1 53 1,150 0.9Dairyland Seed DSR-2810P/R2Y 2.8 Peking 2.3 29 50.0 2.1 52.6 54 350 0.3

Mean 2.7 - 2.2 28 47.3 2.6 63.5 - 885 1.1LSD3 (P = 0.10) - - - - 2.2 0.5 7.5 - 1,115 -

AgVenture 27B3RR 2.7 None 2.0 26 44.8 3.0 62.1 32 3,150 3.3Pioneer 93M11 3.1 None 1.9 34 47.5 2.3 61.7 36 3,025 3.0Asgrow AG2431 2.4 None 2.3 23 44.0 3.8 60.1 43 6,475 4.7

Mean 2.7 - 2.1 28 45.4 3.0 61.3 - 4,217 3.7Values presented in tables are means. Entries are listed in decreasing order of yield. Italicized entries are widely available SCN-susceptible varieties entered by Iowa State University for comparison purposes. 1 Final SCN egg population density (eggs per 100 cc soil); there were no significant differences among initial SCN population densities; initial SCN population 853 eggs per 100 cc soil; HG Type 2.5.7 (33% on PI 88788, 0% on Peking). 2 Average final SCN egg population density / average initial SCN egg population density. 3 Least significant difference: values are from Fisher's least significant difference test, NS = no significant differences among the varieties.

15

Figure 7. Moorhead (WC Iowa) Glyphosate-resistant.

0 10 20 30 40 50 60 70 80

NK S26-P3LG Seeds C2441R2

Dairyland Seed DSR-2616/R2YPioneer P25T51R

Dyna-Gro S26RS75Pioneer P24T19R

Stine 28RE20Cornelius CB24R82

Jacobsen 847NR2NuTech Seed 7273 G2 Genetics

Curry 1246ASGROW AG2935


Beck 297R4ASGROW AG2636

Stine 24RH62Mycogen 5N286R2

GLH 2551NR2FS HiSOY HS 26A50

Champion 28R85NPrairie Brand PB-2668R2

Federal Hybrids F296NRR2YASGROW AG2836Cornelius CB28R58Mycogen 5N293R2

LATHAM L2884R2Legacy Seeds LS2414N RR2

Federal Hybrids F245NRR2YDyna-Gro S29RY46

Prairie Brand PB-2600R2NK S27-J7

NuTech Seed 7240 G2 GeneticsNK S28-D3

Kruger Seeds K2-2603Dairyland Seed DSR-2909/R2Y


LATHAM L2983R2NK S25-L9

Stine 30RE02Pioneer P92Y53

Curry 1252Pioneer P92Y75

Champion 26R83NKruger Seeds K2-2905

LG Seeds C2744R2Merschman Arthur 1630RR2

Hoegemeyer HPT 2913NRPrairie Brand PB-2686R2

Dairyland Seed DSR-2810P/R2Y

AgVenture 27B3RRPioneer 93M11

Asgrow AG2431



- Average initial SCN population density 853 eggs per 100 cc soil.- HG Type 2.5.7 (33% on PI 88788, 0% on Peking).- RF 1.0 = no change in SCN population density over growing season.

16

Table 8. Moorhead (WC Iowa) Conventional.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

Merschman McKinley 1531LL 3.1 PI 88788 2.7 34 49.0 2.8 70.5 1 900 2.0NuTech Seed 3309L 3.0 PI 88788 3.1 34 50.0 2.5 65.3 2 600 1.0Beck 298L4 2.9 PI 88788 2.6 31 51.3 2.8 64.4 3 725 1.4Merschman Comanche 1626LL 2.6 PI 88788 1.7 28 45.3 2.5 62.4 5 1,425 1.9LATHAM L2628L 2.6 PI 88788 1.8 28 45.3 2.5 61.8 6 1,200 2.4eMerge e2993 2.9 PI 88788 2.1 30 45.0 2.0 61.0 8 525 1.4NuTech Seed 3252L 2.5 PI 88788 1.8 28 45.5 2.9 60.4 9 925 2.1Iowa State University IAR2601 2.6 PI 438489B 2.3 26 42.5 2.1 59.3 10 525 0.8Merschman Sioux 1628LL 2.8 PI 88788 2.1 32 49.3 2.8 58.9 12 525 1.6Hoegemeyer HPT LL2877N 2.8 PI 88788 2.3 32 50.0 2.6 58.7 13 650 1.5eMerge e2782 2.7 PI 88788 2.1 26 47.3 2.3 58.3 14 650 1.4Iowa State University AR12-127102 2.4 PI 507354 / PI 88788 2.4 25 48.5 2.8 56.4 15 300 0.8eMerge e3192 3.1 PI 88788 2.4 35 50.5 2.5 51.6 16 875 2.1

Mean 2.8 - 2.3 30 47.7 2.5 60.7 - 756 1.6LSD3 (P = 0.10) - - - - 1.8 0.3 4.0 - NS -

Pioneer 93M11 3.1 None 1.9 34 48.5 2.0 63.4 4 5,500 14.7Asgrow AG2431 2.4 None 2.3 25 44.8 3.1 61.6 7 4,825 6.9AgVenture 27B3RR 2.7 None 2.0 29 43.3 2.4 59.2 11 5,550 14.8

Mean 2.7 - 2.1 29 45.5 2.5 62.7 - 10,342 12.1

Figure 8. Moorhead (WC Iowa) Conventional.

Values presented in tables are means. Entries are listed in decreasing order of yield. Italicized entries are widely available SCN-susceptible varieties entered by Iowa State University for comparison purposes. 1 Final SCN egg population density (eggs per 100 cc soil); there were no significant differences among initial SCN population densities; initial SCN population 484 eggs per 100 cc soil; HG Type 2.5.7 (33% on PI 88788, 0% on Peking). 2 Average final SCN egg population density / average initial SCN egg population density. 3 Least significant difference: values are from Fisher's least significant difference test, NS = no significant differences among the varieties.

0 10 20 30 40 50 60 70 80

Merschman McKinley 1531LLNuTech Seed 3309L

Beck 298L4Merschman Comanche 1626LL

LATHAM L2628LeMerge e2993

NuTech Seed 3252LIowa State University IAR2601

Merschman Sioux 1628LLHoegemeyer HPT LL2877N

eMerge e2782Iowa State University AR12-127102

eMerge e3192

Pioneer 93M11Asgrow AG2431

AgVenture 27B3RR



- Average initial SCN population density 484 eggs per 100 cc soil.- HG Type 2.5.7 (33% on PI 88788, 0% on Peking).- RF 1.0 = no change in SCN population density over growing season.

17

Table 9. Ames (C Iowa) Glyphosate-resistant.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

LG Seeds C2441R2 2.4 PI 88788 1.9 23 36.0 1.6 65.6 1 1,100 0.2Mycogen 5N286R2 2.8 PI 88788 1.6 32 40.5 1.9 64.9 2 1,350 0.2FS HiSOY HS 26A50 2.6 PI 88788 2.0 28 36.3 1.3 63.4 3 1,550 0.4Prairie Brand PB-2668R2 2.6 PI 88788 2.2 30 39.3 1.5 63.3 4 3,475 0.8Stine 30RE02 3.0 PI 88788 2.1 31 39.0 1.4 62.0 5 1,650 0.4Jacobsen 847NR2 2.8 PI 88788 1.9 29 40.0 1.6 61.7 6 2,550 0.7Pioneer P25T51R 2.5 PI 88788 2.0 25 37.8 1.6 61.7 6 1,600 0.3Champion 28R85N 2.8 PI 88788 1.8 31 39.8 1.5 61.1 8 1,550 0.2Cornelius CB24R82 2.4 PI 88788 1.5 23 39.5 1.9 61.1 8 1,625 0.3FS HiSOY HS 28A42 2.8 PI 88788 2.3 30 40.5 1.8 60.7 10 2,200 1.0Pioneer P92Y75 2.7 PI 88788 2.6 29 41.0 1.6 60.7 10 1,825 0.4NK S27-J7 2.7 PI 88788 1.8 29 41.0 2.3 60.7 10 700 0.3Curry 1252 2.5 Peking 2.4 26 36.8 1.4 60.6 13 725 0.3Hoegemeyer HPT 2913NR 2.9 Peking 2.4 28 41.3 1.8 60.4 14 1,275 0.2Dyna-Gro S29RY46 2.9 PI 88788 2.4 31 41.5 1.6 60.4 14 2,900 0.6Merschman Arthur 1630RR2 3.0 PI 88788 1.9 33 39.5 1.8 60.3 16 2,275 0.7Mycogen 5N293R2 2.9 PI 88788 2.8 31 40.8 1.9 60.2 17 2,975 0.7Cornelius CB28R58 2.8 PI 88788 1.6 30 37.5 1.3 60.1 18 2,875 0.3Champion 26R83N 2.6 PI 88788 2.5 27 38.5 1.8 59.9 19 2,425 0.4Federal Hybrids F245NRR2Y 2.4 PI 88788 1.8 27 37.8 1.4 59.8 20 1,325 0.6ASGROW AG2636 2.6 PI 88788 2.1 30 43.5 1.8 59.7 21 1,600 0.3Jacobsen 859NR2 2.9 PI 88788 2.8 32 39.0 1.6 59.6 22 1,950 0.3NK S28-D3 2.8 PI 88788 2.5 29 37.0 1.4 59.5 23 1,750 0.3Federal Hybrids F296NRR2Y 2.9 PI 88788 2.6 31 42.5 1.8 59.1 24 1,950 0.6NuTech Seed 7240 G2 Genetics 2.4 Peking 1.9 25 40.0 1.5 59.0 25 1,875 0.4Curry 1246 2.4 PI 88788 2.1 23 36.0 1.0 59.0 25 2,125 0.4Dairyland Seed DSR-2909/R2Y 2.9 PI 88788 2.3 29 37.8 1.4 58.4 27 3,675 0.8Dyna-Gro S26RS75 2.6 PI 88788 1.6 24 35.3 1.5 58.1 28 1,525 0.3NK S25-L9 2.5 PI 88788 2.6 26 39.8 1.8 58.1 28 1,450 0.3Stine 24RH62 2.4 PI 88788 1.6 22 39.8 1.6 58.0 30 1,500 0.8ASGROW AG2935 2.9 PI 88788 2.4 33 39.3 1.6 57.7 31 1,425 0.3Hoegemeyer HPT 2640NR 2.6 Peking 2.2 26 39.5 1.1 57.3 32 2,150 0.5Stine 28RE20 2.8 PI 88788 2.3 29 35.0 1.1 57.2 33 2,600 0.4LATHAM L2983R2 2.9 PI 88788 2.5 31 39.8 1.5 57.0 34 2,300 0.6NK S26-P3 2.6 PI 88788 2.4 25 37.8 1.5 56.4 35 2,325 0.4LATHAM L2884R2 2.8 PI 88788 1.9 32 36.8 1.3 56.3 36 1,525 0.2Beck 297R4 2.9 PI 88788 2.8 29 38.5 1.3 56.2 37 1,650 0.4GLH 2551NR2 2.5 PI 88788 1.9 23 38.3 1.6 55.4 38 2,425 0.6Legacy Seeds LS2414N RR2 2.4 PI 88788 2.1 25 35.0 1.5 55.3 39 4,625 0.6Kruger Seeds K2-2905 2.9 Peking 2.2 34 41.8 2.0 55.1 40 2,275 0.5Prairie Brand PB-2600R2 2.6 PI 88788 2.3 28 36.8 1.4 55.0 41 8,775 2.8Dairyland Seed DSR-2810P/R2Y 2.8 Peking 2.3 29 44.3 1.6 54.8 42 1,225 0.5ASGROW AG2535 2.5 PI 88788 2.0 25 37.5 2.0 54.5 43 1,650 0.4NuTech Seed 7273 G2 Genetics 2.7 PI 88788 1.9 26 36.8 1.3 54.1 44 1,925 0.7Prairie Brand PB-2686R2 2.6 PI 88788 2.4 23 36.5 1.4 53.8 45 1,475 0.5ASGROW AG2836 2.8 PI 88788 2.4 29 39.8 1.5 53.4 46 3,600 0.9Pioneer P24T19R 2.4 PI 88788 1.9 25 36.0 1.8 52.2 48 1,475 0.3Pioneer P92Y53 2.5 Peking 2.4 25 38.3 1.4 52.1 49 1,375 0.2Kruger Seeds K2-2603 2.6 PI 88788 2.0 27 42.0 2.0 51.2 50 1,725 0.2Dairyland Seed DSR-2616/R2Y 2.6 PI 88788 2.3 27 34.0 1.1 50.2 51 13,800 2.3LG Seeds C2744R2 2.7 PI 88788 2.6 29 40.5 2.6 49.2 52 2,950 0.8

Mean 2.7 - 2.2 28 38.8 1.6 58.1 - 2,365 0.5LSD3 (P = 0.10) - - - - 3.3 0.4 7.7 - 2,259 -

AgVenture 27B3RR 2.7 None 2.0 26 35.8 1.3 53.2 47 4,450 0.9Asgrow AG2431 2.4 None 2.3 23 33.3 1.4 48.9 53 5,850 1.2Pioneer 93M11 3.1 None 1.9 34 38.5 1.5 47.2 54 1,950 0.3


18

Figure 9. Ames (C Iowa) Glyphosate-resistant.

0 10 20 30 40 50 60 70

LG Seeds C2441R2Mycogen 5N286R2

FS HiSOY HS 26A50Prairie Brand PB-2668R2

Stine 30RE02Jacobsen 847NR2Pioneer P25T51R

Champion 28R85NCornelius CB24R82

FS HiSOY HS 28A42Pioneer P92Y75

NK S27-J7Curry 1252

Hoegemeyer HPT 2913NRDyna-Gro S29RY46

Merschman Arthur 1630RR2Mycogen 5N293R2

Cornelius CB28R58Champion 26R83N

Federal Hybrids F245NRR2YASGROW AG2636

Jacobsen 859NR2NK S28-D3

Federal Hybrids F296NRR2YNuTech Seed 7240 G2 Genetics

Curry 1246Dairyland Seed DSR-2909/R2Y

Dyna-Gro S26RS75NK S25-L9

Stine 24RH62ASGROW AG2935

Hoegemeyer HPT 2640NRStine 28RE20

LATHAM L2983R2NK S26-P3

LATHAM L2884R2Beck 297R4

GLH 2551NR2Legacy Seeds LS2414N RR2

Kruger Seeds K2-2905Prairie Brand PB-2600R2

Dairyland Seed DSR-2810P/R2YASGROW AG2535

NuTech Seed 7273 G2 GeneticsPrairie Brand PB-2686R2

ASGROW AG2836Pioneer P24T19R

Pioneer P92Y53Kruger Seeds K2-2603

Dairyland Seed DSR-2616/R2YLG Seeds C2744R2

AgVenture 27B3RR

Asgrow AG2431Pioneer 93M11




19

Table 10. Ames (C Iowa) Conventional.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

Iowa State University IAR2601 2.6 PI 438489B 2.3 26 36.0 1.5 56.8 1 1,275 0.4eMerge e2993 2.9 PI 88788 2.1 30 38.0 1.8 56.6 3 775 0.3Merschman McKinley 1531LL 3.1 PI 88788 2.7 34 43.3 1.9 55.6 5 975 0.1Merschman Comanche 1626LL 2.6 PI 88788 1.7 28 39.8 2.0 55.4 6 1,150 0.1NuTech Seed 3252L 2.5 PI 88788 1.8 28 38.3 1.9 54.5 7 2,075 0.3Merschman Sioux 1628LL 2.8 PI 88788 2.1 32 41.3 2.3 53.9 8 875 0.1Hoegemeyer HPT LL2877N 2.8 PI 88788 2.3 32 41.3 1.9 52.4 9 450 0.1Beck 298L4 2.9 PI 88788 2.6 31 41.0 1.8 52.2 10 825 0.2NuTech Seed 3309L 3.0 PI 88788 3.1 34 39.3 2.1 50.4 11 950 0.1LATHAM L2628L 2.6 PI 88788 1.8 28 37.5 1.8 49.4 12 1,925 0.5eMerge e3192 3.1 PI 88788 2.4 35 41.8 1.8 49.3 13 950 0.3Iowa State University AR12-127102 2.4 PI 507354 / PI 88788 2.4 25 39.5 2.6 48.9 14 950 0.1eMerge e2782 2.7 PI 88788 2.1 26 38.5 1.6 47.2 15 1,000 0.1

Mean 2.8 - 2.3 30 39.7 1.9 52.5 - 1,090 0.2LSD3 (P = 0.10) - - - - 1.9 0.4 5.4 - NS -

AgVenture 27B3RR 2.7 None 2.0 29 36.8 1.4 56.8 1 4,525 1.4Asgrow AG2431 2.4 None 2.3 25 38.5 1.6 56.3 4 3,900 1.1Pioneer 93M11 3.1 None 1.9 34 40.3 1.6 46.7 16 5,375 1.0

Mean 2.7 - 2.1 29 38.5 1.5 53.3 - 4,600 1.2

Figure 10. Ames (C Iowa) Conventional.


0 10 20 30 40 50 60

Iowa State University IAR2601eMerge e2993

Merschman McKinley 1531LLMerschman Comanche 1626LL

NuTech Seed 3252LMerschman Sioux 1628LL

Hoegemeyer HPT LL2877NBeck 298L4

NuTech Seed 3309LLATHAM L2628L

eMerge e3192Iowa State University AR12-127102

eMerge e2782

AgVenture 27B3RRAsgrow AG2431

Pioneer 93M11




20

Table 11. Urbana (EC Iowa) Glyphosate-resistant.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

LG Seeds C2441R2 2.4 PI 88788 1.9 23 39.5 1.5 67.8 1 475 0.5Dyna-Gro S26RS75 2.6 PI 88788 1.6 24 38.5 1.6 65.9 2 425 0.5Hoegemeyer HPT 2640NR 2.6 Peking 2.2 26 38.8 1.0 64.4 3 1,475 2.3Pioneer P92Y75 2.7 PI 88788 2.6 29 40.5 1.3 64.4 3 800 0.7Champion 28R85N 2.8 PI 88788 1.8 31 39.3 1.4 64.3 5 1,125 1.3GLH 2551NR2 2.5 PI 88788 1.9 23 39.5 1.5 64.1 6 1,225 1.6NuTech Seed 7273 G2 Genetics 2.7 PI 88788 1.9 26 36.3 1.5 64.0 7 1,425 1.3Kruger Seeds K2-2603 2.6 PI 88788 2.0 27 48.0 2.1 63.7 8 525 0.8Dairyland Seed DSR-2909/R2Y 2.9 PI 88788 2.3 29 37.8 1.3 63.6 9 1,075 1.4NuTech Seed 7240 G2 Genetics 2.4 Peking 1.9 25 38.5 1.5 63.5 10 225 0.4ASGROW AG2935 2.9 PI 88788 2.4 33 38.0 1.5 63.5 10 925 1.8Hoegemeyer HPT 2913NR 2.9 Peking 2.4 28 39.5 1.5 63.4 12 375 0.4Mycogen 5N286R2 2.8 PI 88788 1.6 32 38.8 1.4 63.4 12 1,075 1.2Stine 24RH62 2.4 PI 88788 1.6 22 38.5 1.6 63.2 14 1,575 1.4LATHAM L2983R2 2.9 PI 88788 2.5 31 41.8 1.5 63.1 15 1,200 2.1ASGROW AG2636 2.6 PI 88788 2.1 30 39.5 1.5 62.8 16 1,200 0.8Cornelius CB24R82 2.4 PI 88788 1.5 23 39.5 1.7 62.5 17 1,100 0.9Dyna-Gro S29RY46 2.9 PI 88788 2.4 31 40.3 1.4 62.2 18 2,225 3.3LATHAM L2884R2 2.8 PI 88788 1.9 32 39.5 1.3 61.9 19 1,200 1.9ASGROW AG2836 2.8 PI 88788 2.4 29 40.8 1.5 61.9 19 2,575 1.6Curry 1246 2.4 PI 88788 2.1 23 36.5 1.1 61.7 21 400 0.6FS HiSOY HS 28A42 2.8 PI 88788 2.3 30 38.3 1.4 61.7 21 1,525 1.1FS HiSOY HS 26A50 2.6 PI 88788 2.0 28 36.0 1.1 61.3 23 300 0.5LG Seeds C2744R2 2.7 PI 88788 2.6 29 45.0 2.4 61.3 23 1,100 2.2Beck 297R4 2.9 PI 88788 2.8 29 40.5 1.3 61.2 25 775 0.7NK S25-L9 2.5 PI 88788 2.6 26 41.3 1.6 61.1 26 750 1.0NK S28-D3 2.8 PI 88788 2.5 29 39.3 1.5 61.1 26 800 0.7Stine 30RE02 3.0 PI 88788 2.1 31 39.8 1.5 61.0 28 1,675 2.6Cornelius CB28R58 2.8 PI 88788 1.6 30 39.5 1.3 61.0 28 2,450 2.6NK S26-P3 2.6 PI 88788 2.4 25 39.5 1.8 61.0 28 1,350 1.0Pioneer P25T51R 2.5 PI 88788 2.0 25 35.3 1.3 60.8 31 2,225 1.5Pioneer P92Y53 2.5 Peking 2.4 25 39.3 1.5 60.7 32 350 0.5Merschman Arthur 1630RR2 3.0 PI 88788 1.9 33 39.0 1.6 60.5 33 925 1.4Stine 28RE20 2.8 PI 88788 2.3 29 35.8 1.4 60.3 34 1,375 1.7Champion 26R83N 2.6 PI 88788 2.5 27 37.5 1.5 60.0 35 775 0.6Curry 1252 2.5 Peking 2.4 26 38.3 1.5 59.9 36 450 0.8Federal Hybrids F296NRR2Y 2.9 PI 88788 2.6 31 40.3 1.5 59.8 37 1,650 1.3ASGROW AG2535 2.5 PI 88788 2.0 25 39.0 1.5 59.5 38 1,400 1.5NK S27-J7 2.7 PI 88788 1.8 29 41.0 2.2 59.5 39 2,300 2.3Prairie Brand PB-2686R2 2.6 PI 88788 2.4 23 38.0 1.5 59.3 40 775 1.3Kruger Seeds K2-2905 2.9 Peking 2.2 34 43.8 2.0 59.3 40 775 0.9Legacy Seeds LS2414N RR2 2.4 PI 88788 2.1 25 39.0 1.8 59.0 42 1,000 0.8Jacobsen 859NR2 2.9 PI 88788 2.8 32 39.3 1.4 58.9 43 2,200 3.3Pioneer P24T19R 2.4 PI 88788 1.9 25 36.8 1.8 58.6 44 550 0.6Dairyland Seed DSR-2810P/R2Y 2.8 Peking 2.3 29 44.0 1.6 58.4 45 375 0.3Jacobsen 847NR2 2.8 PI 88788 1.9 29 37.5 1.5 58.1 46 925 1.2Mycogen 5N293R2 2.9 PI 88788 2.8 31 40.5 1.6 58.0 47 1,150 1.8Prairie Brand PB-2668R2 2.6 PI 88788 2.2 30 39.8 1.5 56.2 49 1,125 2.8Dairyland Seed DSR-2616/R2Y 2.6 PI 88788 2.3 27 39.0 1.5 55.4 50 6,800 10.5Prairie Brand PB-2600R2 2.6 PI 88788 2.3 28 37.3 1.5 55.0 51 7,350 5.7Federal Hybrids F245NRR2Y 2.4 PI 88788 1.8 27 36.3 1.1 53.8 54 3,075 3.2

Mean - 2.2 28 39.3 1.5 61.1 - 1,390 1.6LSD3 (P = 0.10) - - - - 2.1 0.3 3.7 - 1,569 -

AgVenture 27B3RR 2.7 None 2.0 26 36.3 1.4 56.7 48 3,625 2.9Pioneer 93M11 3.1 None 1.9 34 39.5 1.5 54.3 52 5,875 4.3Asgrow AG2431 2.4 None 2.3 23 37.3 1.5 54.1 53 6,150 6.8

Mean 2.7 - 2.1 27.67 37.7 1.5 55.0 - 5,217 4.7Values presented in tables are means. Entries are listed in decreasing order of yield.` Italicized entries are widely available SCN-susceptible varieties entered by Iowa State University for comparison purposes. 1 Final SCN egg population density (eggs per 100 cc soil); there were no significant differences among initial SCN population densities; initial SCN population 924 eggs per 100 cc soil; HG Type 2.7 (14% on PI 88788, 1% on Peking). 2 Average final SCN egg population density / average initial SCN egg population density. 3 Least significant difference: values are from Fisher's least significant difference test, NS = no significant differences among the varieties.

21

Figure 11. Urbana (EC Iowa) Glyphosate-resistant.

0 10 20 30 40 50 60 70

LG Seeds C2441R2Dyna-Gro S26RS75

Hoegemeyer HPT 2640NRPioneer P92Y75

Champion 28R85NGLH 2551NR2

NuTech Seed 7273 G2 GeneticsKruger Seeds K2-2603

Dairyland Seed DSR-2909/R2YNuTech Seed 7240 G2 Genetics

ASGROW AG2935Hoegemeyer HPT 2913NR

Mycogen 5N286R2Stine 24RH62

LATHAM L2983R2ASGROW AG2636Cornelius CB24R82Dyna-Gro S29RY46LATHAM L2884R2ASGROW AG2836

Curry 1246FS HiSOY HS 28A42FS HiSOY HS 26A50

LG Seeds C2744R2Beck 297R4NK S25-L9NK S28-D3

Stine 30RE02Cornelius CB28R58

NK S26-P3Pioneer P25T51R

Pioneer P92Y53Merschman Arthur 1630RR2

Stine 28RE20Champion 26R83N

Curry 1252Federal Hybrids F296NRR2Y

ASGROW AG2535NK S27-J7

Prairie Brand PB-2686R2Kruger Seeds K2-2905

Legacy Seeds LS2414N RR2Jacobsen 859NR2Pioneer P24T19R

Dairyland Seed DSR-2810P/R2YJacobsen 847NR2

Mycogen 5N293R2Prairie Brand PB-2668R2

Dairyland Seed DSR-2616/R2YPrairie Brand PB-2600R2

Federal Hybrids F245NRR2Y

AgVenture 27B3RRPioneer 93M11

Asgrow AG2431



- Average initial SCN population density 924 eggs per 100 cc soil.- HG Type 2.7 (14% on PI 88788, 1% on Peking).- RF 1.0 = no change in SCN population density over growing season.

22

Table 12. Urbana (EC Iowa) Conventional.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

LATHAM L2628L 2.6 PI 88788 1.8 28 40.8 1.6 64.8 1 250 1.7Merschman Comanche 1626LL 2.6 PI 88788 1.7 28 42.3 1.6 63.5 4 400 2.7NuTech Seed 3252L 2.5 PI 88788 1.8 28 43.8 1.9 63.3 5 350 1.4Beck 298L4 2.9 PI 88788 2.6 31 43.3 1.4 62.9 6 550 4.4NuTech Seed 3309L 3.0 PI 88788 3.1 34 42.8 1.8 62.2 7 250 1.7Merschman McKinley 1531LL 3.1 PI 88788 2.7 34 43.3 1.9 58.0 9 100 0.3Iowa State University AR12-127102 2.4 PI 507354 / PI 88788 2.4 25 41.3 1.9 57.6 10 75 0.5Hoegemeyer HPT LL2877N 2.8 PI 88788 2.3 32 44.5 1.9 57.4 11 225 1.3Iowa State University IAR2601 2.6 PI 438489B 2.3 26 36.8 1.5 57.3 12 200 0.7Merschman Sioux 1628LL 2.8 PI 88788 2.1 32 43.3 1.9 57.2 13 250 1.0eMerge e3192 3.1 PI 88788 2.4 35 42.8 1.5 56.5 14 175 1.8eMerge e2993 2.9 PI 88788 2.1 30 38.3 1.6 56.3 15 75 0.3eMerge e2782 2.7 PI 88788 2.1 26 39.3 1.3 53.5 16 150 0.4

Mean 2.8 - 2.2 30 41.7 1.7 59.3 - 235 1.4LSD3 (P = 0.10) - - - - 2.5 0.4 4.0 - 224 -

Pioneer 93M11 3.1 None 1.9 34 41.8 1.5 63.7 2 2,675 10.7Asgrow AG2431 2.4 None 2.3 25 38.8 1.5 63.7 2 3,125 17.9AgVenture 27B3RR 2.7 None 2.0 29 38.0 1.3 59.8 8 2,250 15.0

Mean 2.7 - 2.1 29 39.5 1.4 62.4 - 2,683 14.5

Figure 12. Urbana (EC Iowa) Conventional.

Values presented in tables are means. Entries are listed in decreasing order of yield. Italicized entries are widely available SCN-susceptible varieties entered by Iowa State University for comparison purposes. 1 Final SCN egg population density (eggs per 100 cc soil); there were no significant differences among initial SCN population densities; initial SCN population 208 eggs per 100 cc soil; HG Type 2.7 (14% on PI 88788, 1% on Peking). 2 Average final SCN egg population density / average initial SCN egg population density. 3 Least significant difference: values are from Fisher's least significant difference test, NS = no significant differences among the varieties.

0 10 20 30 40 50 60 70

LATHAM L2628LMerschman Comanche 1626LL


NuTech Seed 3309LMerschman McKinley 1531LL

Iowa State University AR12-127102Hoegemeyer HPT LL2877N

Iowa State University IAR2601Merschman Sioux 1628LL

eMerge e3192eMerge e2993eMerge e2782

Pioneer 93M11

Asgrow AG2431AgVenture 27B3RR



- Average initial SCN population density 208 eggs per 100 cc soil.- HG Type 2.7 (14% on PI 88788, 1% on Peking).- RF 1.0 = no change in SCN population density over growing season.

24

Figure 13. Glenwood (SW Iowa) Glyphosate-resistant.



0 10 20 30 40 50 60 70

NK S30-V6NK S34-P7

ASGROW AG2935Stine 33RH20

NK S30-C1Cornelius CB30R15

Pioneer P33T72RMorSoy 33X14

NK S32-L8FS HiSOY HS 32A50

Prairie Brand PB-3586R2GLH 3059R2

Curry 1308Federal Hybrids F364NRR2Y

Kruger Seeds K2-3503Dyna-Gro S31RY86

Pioneer P31T11RPioneer P34T07R2

LATHAM L3385R2Hoegemeyer HPT 3220NR

Beck 323R4NuTech Seed 7357R2 G2 Genetics

Green Valley Seed 356ASGROW AG2836ASGROW AG3034

Prairie Brand PB-3186R2Stine 28RE20

FS HiSOY HS 31A50Curry 1299

Dairyland Seed DSR-3250/R2YChampion 29R36NLG Seeds C3647R2

Dairyland Seed DSR-3313/R2YPrairie Brand PB-3076R2

Jacobsen 956NR2ASGROW AG3536

NuTech Seed 7307 G2 GeneticsDairyland Seed DSR-3595/R2Y

Champion 32R95NCornelius CB29R69

Merschman Kennedy 1636RR2Jacobsen 954NR2Pioneer P39T67R

Mycogen 5N342R2Dyna-Gro S37RS96LATHAM L3448R2

Federal Hybrids F346NRR2YLG Seeds C2890R2Mycogen 5N386R2

Stine 38RE02Kruger Seeds K2-3204

AgVenture 27B3RR

AgVenture VPMaxx 32B1RRPioneer 93M11


25

Table 14. Glenwood (SW Iowa) Conventional.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

Beck 366L4 3.6 PI 88788 2.8 23 45.0 2.5 72.9 1 2,575 1.3Beck 337L4 3.3 PI 88788 2.9 21 43.5 3.1 72.1 2 1,775 1.0Merschman Truman 1438LL 3.8 PI 88788 2.7 22 45.5 2.6 62.2 3 3,125 2.2Merschman Adams 1434LL 3.4 PI 88788 2.6 21 42.8 2.6 60.2 4 1,825 0.6Hoegemeyer HPT LL3455NS 3.4 PI 88788 2.7 23 41.8 2.3 58.4 5 1,750 1.1LATHAM L3384L 3.3 PI 88788 2.6 20 46.5 2.5 58.3 6 3,375 1.8NuTech Seed 3309L 3.0 PI 88788 2.8 20 46.0 2.9 57.7 7 2,475 1.5Merschman Grant 1537LL 3.7 PI 88788 2.4 22 45.8 2.4 51.0 10 2,375 1.4eMerge e3494 3.4 PI 88788 2.5 24 43.5 2.3 50.9 11 1,800 1.3eMerge e3692S 3.6 PI 88788 2.1 23 45.5 3.0 48.7 13 1,800 0.7

Mean 3.5 - 2.6 22 44.6 2.6 59.2 - 2,288 1.3LSD3 (P = 0.10) - - - - NS 0.4 7.0 - NS -

AgVenture 27B3RR 2.7 None 2.3 17 40.5 1.9 56.1 8 2,200 1.2AgVenture VPMaxx 32B1RR 3.2 None 2.0 19 43.8 1.8 55.4 9 3,600 1.7Pioneer 93M11 3.1 None 1.8 21 44.3 2.4 50.2 12 2,575 1.1

Mean 3.0 - 2.0 19 42.9 2.0 53.9 - 2,792 1.3

Figure 14. Glenwood (SW Iowa) Conventional.


0 10 20 30 40 50 60 70 80

Beck 366L4Beck 337L4

Merschman Truman 1438LLMerschman Adams 1434LL

Hoegemeyer HPT LL3455NSLATHAM L3384L

NuTech Seed 3309LMerschman Grant 1537LL

eMerge e3494eMerge e3692S

AgVenture 27B3RR

AgVenture VPMaxx 32B1RRPioneer 93M11




26

Table 15. Oskaloosa (SC Iowa) Glyphosate-resistant.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

SDS Index (0-100)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

NK S30-V6 3.0 PI 88788 2.3 22 39.3 1.8 0.0 59.5 1 4,125 0.9NuTech Seed 7357R2 G2 Genetics 3.5 PI 88788 2.1 23 39.0 1.6 7.0 55.5 2 4,700 0.4Pioneer P31T11R 3.1 PI 88788 2.1 22 40.5 1.3 12.0 54.5 3 8,125 2.5Prairie Brand PB-3186R2 3.1 PI 88788 2.5 22 38.5 1.5 3.5 54.4 4 3,575 0.6ASGROW AG2836 2.8 PI 88788 2.6 21 39.0 1.5 11.0 54.1 5 3,800 0.4FS HiSOY HS 31A50 3.1 PI 88788 2.3 21 37.5 1.5 3.5 52.9 6 5,750 1.1Curry 1299 2.9 Peking 2.1 17 38.5 1.3 18.8 50.5 7 1,975 0.2NuTech Seed 7307 G2 Genetics 3.0 PI 88788 2.4 24 40.3 1.4 9.5 50.2 8 3,100 0.5MorSoy 33X14 3.3 PI 88788 2.1 21 38.3 1.5 20.3 50.2 8 2,550 0.8ASGROW AG2935 2.9 PI 88788 2.3 20 37.0 1.5 27.5 49.6 10 2,100 0.4Pioneer P34T07R2 3.4 PI 88788 1.8 21 36.8 1.8 21.5 48.6 11 3,950 0.5Champion 29R36N 2.9 PI 88788 2.4 22 39.0 1.4 2.8 48.5 12 2,475 0.7Beck 323R4 3.2 PI 88788 2.6 20 39.5 1.5 7.3 48.3 13 4,450 0.6Prairie Brand PB-3076R2 3.0 PI 88788 2.5 19 39.8 1.4 6.0 47.9 14 5,425 1.6Mycogen 5N386R2 3.8 PI 88788 2.8 29 42.3 1.5 8.3 47.7 15 3,950 0.9Dairyland Seed DSR-3250/R2Y 3.2 PI 88788 2.2 22 40.3 2.0 7.3 47.7 15 5,100 0.6Dairyland Seed DSR-3595/R2Y 3.5 PI 88788 1.9 22 41.0 1.8 20.0 46.9 17 11,600 2.0Green Valley Seed 356 3.5 PI 88788 2.1 23 34.8 1.6 8.3 46.4 18 3,825 0.4NK S32-L8 3.2 PI 88788 1.9 24 41.3 1.6 20.8 46.4 18 1,800 0.3Dyna-Gro S31RY86 3.1 PI 88788 2.4 21 38.0 1.5 12.8 46.2 20 3,475 0.3Cornelius CB29R69 2.9 PI 88788 2.4 22 37.0 1.4 16.8 46.1 21 4,650 0.6Dyna-Gro S37RS96 3.7 PI 88788 2.4 26 37.5 1.9 8.3 46.0 22 2,875 0.3Prairie Brand PB-3586R2 3.5 PI 88788 2.8 25 37.5 2.0 13.8 45.9 23 3,200 0.7Pioneer P39T67R 3.9 PI 88788 2.5 23 38.5 1.5 3.0 45.6 24 3,150 1.1FS HiSOY HS 32A50 3.2 PI 88788 2.8 22 33.8 1.5 16.8 45.3 25 2,125 0.2Jacobsen 956NR2 3.6 PI 88788 2.5 19 38.5 1.6 8.8 45.0 26 2,550 0.6LG Seeds C2890R2 2.8 PI 88788 2.2 21 37.5 1.4 15.5 45.0 27 3,500 0.9Mycogen 5N342R2 3.4 PI 88788 2.2 23 39.0 1.5 23.0 44.7 28 2,725 1.0LATHAM L3448R2 3.4 PI 88788 2.3 22 37.8 1.5 13.8 44.3 29 9,350 2.5Champion 32R95N 3.2 PI 88788 2.3 23 40.0 1.6 8.8 43.5 30 6,575 1.6Federal Hybrids F346NRR2Y 3.4 PI 88788 2.3 21 41.3 1.8 20.8 43.5 30 9,575 2.3Merschman Kennedy 1636RR2 3.6 PI 88788 2.1 25 36.8 1.6 24.0 42.4 33 2,800 0.5Pioneer P33T72R 3.3 PI 88788 2.2 23 34.8 1.4 26.3 41.8 34 3,600 0.5GLH 3059R2 3.0 PI 88788 2.4 18 37.8 1.9 36.8 41.7 35 3,450 0.5Curry 1308 3.0 PI 88788 2.6 22 37.0 1.1 5.0 41.4 36 4,300 0.5NK S34-P7 3.4 PI 88788 2.3 25 33.0 1.1 22.0 41.2 37 2,600 0.4LG Seeds C3647R2 3.6 PI 88788 2.7 26 38.8 1.8 25.0 40.9 38 2,975 0.7Stine 38RE02 3.8 PI 88788 2.0 19 36.3 1.6 23.5 40.7 39 10,450 2.0Dairyland Seed DSR-3313/R2Y 3.3 PI 88788 2.5 21 37.5 1.5 25.0 40.4 40 5,975 1.7Kruger Seeds K2-3503 3.5 PI 88788 2.6 23 37.0 1.5 28.3 40.4 40 3,625 1.2Hoegemeyer HPT 3220NR 3.2 PI 88788 2.1 21 38.8 1.3 35.0 40.3 42 4,400 1.2ASGROW AG3034 3.0 PI 88788 2.2 21 39.5 1.4 37.5 40.3 42 4,325 0.8Federal Hybrids F364NRR2Y 3.6 PI 88788 2.2 23 39.3 1.6 17.3 39.8 44 2,175 0.6Cornelius CB30R15 3.0 PI 88788 2.3 21 37.0 1.6 34.8 39.5 45 4,450 0.5Stine 28RE20 2.8 PI 88788 1.8 17 30.3 1.3 42.3 38.2 46 3,500 0.5Jacobsen 954NR2 3.4 PI 88788 2.6 22 37.5 1.4 32.0 37.6 48 9,175 1.9ASGROW AG3536 3.5 PI 88788 2.7 24 39.0 1.5 24.3 36.9 49 3,425 0.4NK S30-C1 3.0 PI 88788 1.7 20 29.8 1.0 34.8 36.6 50 4,575 1.3LATHAM L3385R2 3.3 PI 88788 2.6 22 35.8 1.0 44.3 35.4 51 4,075 1.2Kruger Seeds K2-3204 3.2 PI 88788 2.3 21 33.8 1.6 51.0 32.2 53 3,500 0.4Stine 33RH20 3.3 PI 88788 2.2 22 35.3 1.5 35.0 30.0 54 3,625 0.4

Mean 3.3 - 2.3 22 37.7 1.5 19.3 44.7 - 4,375 0.9LSD3 (P = 0.10) - - - - 3.5 0.3 16.7 8.0 - NS -

AgVenture VPMaxx 32B1RR 3.2 None 2.0 19 37.0 1.3 15.3 43.2 32 23,200 2.3AgVenture 27B3RR 2.7 None 2.3 18 34.0 1.0 34.7 37.8 47 7,125 1.4Pioneer 93M11 3.1 None 1.8 22 35.5 1.4 25.8 34.7 52 6,200 0.8

Mean 3.0 - 2.0 20 35.5 1.2 25.3 38.6 - 12,175 1.5Values presented in tables are means. Entries are listed in decreasing order of yield. Italicized entries are widely available SCN-susceptible varieties entered by Iowa State University for comparison purposes. 1 Final SCN egg population density (eggs per 100 cc soil); there were no significant differences among initial SCN population densities; initial SCN population 6,123 eggs per 100 cc soil; HG Type 2.5.7 (38% on PI 88788, 5% on Peking). 2 Average final SCN egg population density / average initial SCN egg population density. 3 Least significant difference: values are from Fisher's least significant difference test, NS = no significant differences among the varieties.

This location had significant Sudden Death Syndrome (SDS), which likely influenced yields. SDS ratings are presented here, and the rating technique is referenced in the report text.

27

Figure 15. Oskaloosa (SC Iowa) Glyphosate-resistant.



0 10 20 30 40 50 60

NK S30-V6NuTech Seed 7357R2 G2 Genetics

Pioneer P31T11RPrairie Brand PB-3186R2


Curry 1299NuTech Seed 7307 G2 Genetics

MorSoy 33X14ASGROW AG2935Pioneer P34T07R2Champion 29R36N

Beck 323R4Prairie Brand PB-3076R2

Mycogen 5N386R2Dairyland Seed DSR-3250/R2YDairyland Seed DSR-3595/R2Y

Green Valley Seed 356NK S32-L8

Dyna-Gro S31RY86Cornelius CB29R69Dyna-Gro S37RS96

Prairie Brand PB-3586R2Pioneer P39T67R


LG Seeds C2890R2Mycogen 5N342R2

LATHAM L3448R2Champion 32R95N

Federal Hybrids F346NRR2YMerschman Kennedy 1636RR2

Pioneer P33T72RGLH 3059R2

Curry 1308NK S34-P7

LG Seeds C3647R2Stine 38RE02

Dairyland Seed DSR-3313/R2YKruger Seeds K2-3503


Federal Hybrids F364NRR2YCornelius CB30R15

Stine 28RE20Jacobsen 954NR2

ASGROW AG3536NK S30-C1

LATHAM L3385R2Kruger Seeds K2-3204

Stine 33RH20

AgVenture VPMaxx 32B1RRAgVenture 27B3RR

Pioneer 93M11


This location had significant Sudden Death Syndrome (SDS), which likely influenced yields. SDS ratings are presented in Table 15, and the rating technique is referenced in the report text.

This location had significant Sudden Death Syndrome (SDS),which likely influenced yields. SDS ratings are presented in Table 15 and the rating technique is referenced in the report text.

28

Table 16. Oskaloosa (SC Iowa) Conventional.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

SDS Index (0-100)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

Beck 337L4 3.3 PI 88788 2.9 21 32.3 1.8 4.3 60.2 1 2,025 0.3Beck 366L4 3.6 PI 88788 2.8 23 36.5 1.8 7.5 58.7 2 2,975 0.3Merschman Truman 1438LL 3.8 PI 88788 2.7 22 37.3 1.6 11.3 54.6 3 4,125 1.4Merschman Adams 1434LL 3.4 PI 88788 2.6 21 35.8 1.3 1.0 52.4 4 1,675 0.1LATHAM L3384L 3.3 PI 88788 2.6 20 36.3 1.6 2.5 51.7 5 4,225 0.5Hoegemeyer HPT LL3455NS 3.4 PI 88788 2.7 23 33.8 1.5 1.0 51.6 6 1,525 0.6NuTech Seed 3309L 3.0 PI 88788 2.8 20 34.0 1.4 4.3 50.2 7 1,050 0.2eMerge e3494 3.4 PI 88788 2.5 24 32.8 1.1 6.0 49.0 8 700 0.1Merschman Grant 1537LL 3.7 PI 88788 2.4 22 35.5 1.4 5.0 46.2 9 1,175 0.6eMerge e3692S 3.6 PI 88788 2.1 23 34.5 1.4 18.3 44.5 12 1,000 0.1

Mean 3.5 - 2.6 22 34.9 1.5 6.1 51.9 - 2,048 0.4LSD3 (P = 0.10) - - - - 2.5 0.3 NS 5.1 - 1,335 -

Pioneer 93M11 3.1 None 1.8 21 34.3 1.3 9.8 45.0 10 2,325 0.6AgVenture VPMaxx 32B1RR 3.2 None 2.0 19 34.0 1.0 16.0 44.7 11 3,875 1.1AgVenture 27B3RR 2.7 None 2.3 17 28.0 1.0 10.5 44.0 13 2,925 0.3

Mean 3.0 - 2.0 19 32.1 1.1 12.1 44.6 - 3,042 0.7

Figure 16. Oskaloosa (SC Iowa) Conventional.


This location had significant Sudden Death Syndrome (SDS), which likely influenced yields. SDS ratings are presented here, and the rating technique is referenced in the report text.

0 10 20 30 40 50 60 70

Beck 337L4Beck 366L4

Merschman Truman 1438LLMerschman Adams 1434LL

LATHAM L3384LHoegemeyer HPT LL3455NS

NuTech Seed 3309LeMerge e3494

Merschman Grant 1537LLeMerge e3692S

Pioneer 93M11

AgVenture VPMaxx 32B1RRAgVenture 27B3RR




29

Table 17. Fruitland (SE Iowa) Glyphosate-resistant.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

NK S30-V6 3.0 PI 88788 2.3 22 31.5 1.4 71.0 1 5,200 1.9ASGROW AG2836 2.8 PI 88788 2.6 21 32.3 1.0 70.4 2 9,225 1.8Prairie Brand PB-3076R2 3.0 PI 88788 2.5 19 33.3 1.0 68.7 3 9,100 2.5Pioneer P31T11R 3.1 PI 88788 2.1 22 29.3 1.0 68.4 4 10,700 2.6ASGROW AG2935 2.9 PI 88788 2.3 20 31.0 1.0 67.4 5 4,100 0.7Champion 29R36N 2.9 PI 88788 2.4 22 32.3 1.1 66.9 6 7,250 1.7LG Seeds C2890R2 2.8 PI 88788 2.2 21 32.0 1.0 66.6 7 10,900 1.8MorSoy 33X14 3.3 PI 88788 2.1 21 31.8 1.3 66.0 8 6,150 1.0Curry 1299 2.9 Peking 2.1 17 31.0 1.0 65.8 9 575 0.1Cornelius CB29R69 2.9 PI 88788 2.4 22 32.3 1.0 64.4 10 9,850 1.3Federal Hybrids F346NRR2Y 3.4 PI 88788 2.3 21 34.5 1.1 64.3 11 10,550 2.9NK S34-P7 3.4 PI 88788 2.3 25 29.0 1.0 64.3 11 7,425 1.6Pioneer P34T07R2 3.4 PI 88788 1.8 21 30.8 1.0 64.0 13 7,675 1.3Kruger Seeds K2-3204 3.2 PI 88788 2.3 21 31.3 1.3 63.3 14 7,075 1.2NuTech Seed 7357R2 G2 Genetics 3.5 PI 88788 2.1 23 36.0 1.5 63.0 15 12,850 2.0FS HiSOY HS 31A50 3.1 PI 88788 2.3 21 31.3 1.0 62.9 16 5,800 0.7ASGROW AG3034 3.0 PI 88788 2.2 21 31.0 1.0 62.7 17 8,075 1.5NK S32-L8 3.2 PI 88788 1.9 24 35.3 1.3 62.5 18 6,425 1.0Beck 323R4 3.2 PI 88788 2.6 20 33.3 1.0 62.5 18 14,600 3.2FS HiSOY HS 32A50 3.2 PI 88788 2.8 22 31.3 1.1 62.2 20 7,150 1.2Dairyland Seed DSR-3595/R2Y 3.5 PI 88788 1.9 22 36.3 1.5 61.8 21 10,825 2.0Merschman Kennedy 1636RR2 3.6 PI 88788 2.1 25 35.3 1.3 61.4 22 15,375 2.8ASGROW AG3536 3.5 PI 88788 2.7 24 33.3 1.3 61.3 23 7,825 1.3LATHAM L3385R2 3.3 PI 88788 2.6 22 34.3 1.0 60.9 24 15,475 3.3Dairyland Seed DSR-3313/R2Y 3.3 PI 88788 2.5 21 33.5 1.1 60.8 25 11,625 2.2Cornelius CB30R15 3.0 PI 88788 2.3 21 32.0 1.0 60.5 26 7,900 1.8Mycogen 5N342R2 3.4 PI 88788 2.2 23 33.8 1.0 60.2 27 14,475 3.0Dyna-Gro S31RY86 3.1 PI 88788 2.4 21 29.8 1.1 60.2 27 8,375 1.6Kruger Seeds K2-3503 3.5 PI 88788 2.6 23 33.0 1.3 60.1 29 9,775 1.7Prairie Brand PB-3186R2 3.1 PI 88788 2.5 22 31.3 1.0 60.0 30 13,500 2.5Federal Hybrids F364NRR2Y 3.6 PI 88788 2.2 23 33.8 1.5 60.0 30 11,925 2.5Dairyland Seed DSR-3250/R2Y 3.2 PI 88788 2.2 22 35.0 1.3 59.8 32 12,300 2.1Jacobsen 954NR2 3.4 PI 88788 2.6 22 33.5 1.4 59.6 33 10,925 2.1Jacobsen 956NR2 3.6 PI 88788 2.5 19 34.3 1.1 59.6 33 11,925 1.4Prairie Brand PB-3586R2 3.5 PI 88788 2.8 25 35.3 1.5 59.5 35 8,950 2.3Pioneer P39T67R 3.9 PI 88788 2.5 23 33.8 1.1 59.5 35 9,650 2.7Green Valley Seed 356 3.5 PI 88788 2.1 23 33.3 1.4 59.3 37 12,775 2.7LG Seeds C3647R2 3.6 PI 88788 2.7 26 32.5 1.3 58.9 38 15,775 3.0Pioneer P33T72R 3.3 PI 88788 2.2 23 30.0 1.0 58.3 39 14,200 3.2GLH 3059R2 3.0 PI 88788 2.4 18 30.8 1.5 58.0 40 12,750 2.1Dyna-Gro S37RS96 3.7 PI 88788 2.4 26 33.0 1.5 57.9 41 12,325 1.8LATHAM L3448R2 3.4 PI 88788 2.3 22 32.5 1.4 57.7 42 8,225 1.3Stine 28RE20 2.8 PI 88788 1.8 17 27.5 1.0 57.3 43 11,025 2.7Stine 33RH20 3.3 PI 88788 2.2 22 31.3 1.4 56.4 44 9,300 1.6NK S30-C1 3.0 PI 88788 1.7 20 26.5 1.0 56.4 44 8,900 1.6Hoegemeyer HPT 3220NR 3.2 PI 88788 2.1 21 31.3 1.0 56.0 46 12,950 2.4Mycogen 5N386R2 3.8 PI 88788 2.8 29 34.0 1.0 55.2 47 13,650 1.9Curry 1308 3.0 PI 88788 2.6 22 31.8 1.0 54.5 48 16,900 2.5Stine 38RE02 3.8 PI 88788 2.0 19 33.5 1.1 53.2 49 18,650 2.6Champion 32R95N 3.2 PI 88788 2.3 23 31.0 1.1 52.1 50 23,200 4.5NuTech Seed 7307 G2 Genetics 3.0 PI 88788 2.4 24 32.5 1.0 51.6 51 8,100 1.4

Mean 3.3 - 2.3 22 32.4 1.2 61.1 - 10,593 2.0LSD3 (P = 0.10) - - - - 2.3 0.2 5.2 - 6,431 -

Pioneer 93M11 3.1 None 1.8 22 28.3 1.0 47.7 52 26,075 3.3AgVenture VPMaxx 32B1RR 3.2 None 2.0 19 26.3 1.0 45.6 53 17,075 1.9AgVenture 27B3RR 2.7 None 2.3 18 23.3 1.0 35.8 54 17,950 5.3


30

Figure 17. Fruitland (SE Iowa) Glyphosate-resistant.



0 10 20 30 40 50 60 70 80

NK S30-V6ASGROW AG2836


ASGROW AG2935Champion 29R36NLG Seeds C2890R2

MorSoy 33X14Curry 1299

Cornelius CB29R69Federal Hybrids F346NRR2Y

NK S34-P7Pioneer P34T07R2

Kruger Seeds K2-3204NuTech Seed 7357R2 G2 Genetics

FS HiSOY HS 31A50ASGROW AG3034

NK S32-L8Beck 323R4

FS HiSOY HS 32A50Dairyland Seed DSR-3595/R2YMerschman Kennedy 1636RR2

ASGROW AG3536LATHAM L3385R2

Dairyland Seed DSR-3313/R2YCornelius CB30R15Mycogen 5N342R2

Dyna-Gro S31RY86Kruger Seeds K2-3503

Prairie Brand PB-3186R2Federal Hybrids F364NRR2Y

Dairyland Seed DSR-3250/R2YJacobsen 954NR2Jacobsen 956NR2


Green Valley Seed 356LG Seeds C3647R2

Pioneer P33T72RGLH 3059R2

Dyna-Gro S37RS96LATHAM L3448R2

Stine 28RE20Stine 33RH20

NK S30-C1Hoegemeyer HPT 3220NR

Mycogen 5N386R2Curry 1308

Stine 38RE02Champion 32R95N

NuTech Seed 7307 G2 Genetics

Pioneer 93M11AgVenture VPMaxx 32B1RR

AgVenture 27B3RR


31

Table 18. Fruitland (SE Iowa) Conventional.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

NuTech Seed 3309L 3.0 PI 88788 2.8 20 33.3 1.0 64.3 1 5,350 0.6Beck 337L4 3.3 PI 88788 2.9 21 30.3 1.1 62.4 2 7,400 0.8Merschman Adams 1434LL 3.4 PI 88788 2.6 21 31.5 1.0 59.7 3 10,350 1.2Beck 366L4 3.6 PI 88788 2.8 23 32.3 1.1 59.3 4 12,625 2.3Merschman Grant 1537LL 3.7 PI 88788 2.4 22 33.3 1.0 57.5 5 5,475 0.8Hoegemeyer HPT LL3455NS 3.4 PI 88788 2.7 23 33.0 1.0 57.3 6 11,150 1.7Merschman Truman 1438LL 3.8 PI 88788 2.7 22 32.8 1.0 56.0 7 21,275 2.8eMerge e3494 3.4 PI 88788 2.5 24 32.3 1.0 52.3 8 14,875 2.1LATHAM L3384L 3.3 PI 88788 2.6 20 30.0 1.0 51.3 9 26,925 2.3eMerge e3692S 3.6 PI 88788 2.1 23 31.0 1.0 50.5 10 15,025 1.8

Mean 3.5 - 2.6 22 32.0 1.0 57.1 - 13,045 1.6LSD3 (P = 0.10) - - - - 1.4 NS 3.7 - 7,102 -

Pioneer 93M11 3.1 None 1.8 21 28.3 1.0 43.2 11 21,450 2.5AgVenture VPMaxx 32B1RR 3.2 None 2.0 19 25.8 1.0 40.4 12 21,300 2.6AgVenture 27B3RR 2.7 None 2.3 17 22.0 1.0 35.1 13 21,575 2.8

Mean 3.0 - 2.0 19 25.4 1.0 39.6 - 21,442 2.7

Figure 18. Fruitland (SE Iowa) Conventional.


0 10 20 30 40 50 60 70


Merschman Adams 1434LLBeck 366L4

Merschman Grant 1537LLHoegemeyer HPT LL3455NSMerschman Truman 1438LL

eMerge e3494LATHAM L3384L

eMerge e3692S

Pioneer 93M11AgVenture VPMaxx 32B1RR

AgVenture 27B3RR




32

Table 19. Seed treatments used on varieties evaluated in 2015. Acceleron®

ASGROW, Green Valley Seed, Kruger Bonus Coated +™ Merschman CruiserMaxx® Champion, Curry (1299), Dairyland Seed, Federal Hybrids, GLH, FS HiSOY, Iowa State University, LATHAM, LG Seeds, Mycogen, NK, Stine, Wensman CruiserMaxx®/ Vibrance™ Cornelius, Dyna-Gro, eMerge, MorSoy

Curry Coat Curry Escalate™ Beck’s Hybrids Gaucho®/Allegiance®/Evergol™ Hoegemeyer Gaucho®/ Trilex® Jacobsen L-Coat Total Legacy Seeds Inc.

PPST Pioneer Prairie ShieldTM XTRA Prairie Brand SoyShield ™ Plus LATHAM (L2128R2, L2884R2, L3385R2, L3448R2) SmartCoteTM Extra NuTech Seed

Table 20. Contact information for companies represented in 2015 variety trials. Beck’s Hybrids - Craig Hurley phone: 317-447-1087 e-mail: [email protected] website: www.beckshybrids.com Champion Seed - Rob Thomas phone: 515-836-2140 e-mail: [email protected] website: www.championseedofiowa.com Cornelius Seed - Will Cornelius phone: 563-672-3463 e-mail: [email protected] website: www.corneliusseed.com Crop Production Services (Dyna-Gro) - Mick Schonauer phone: 614-761-4110 email: [email protected] website: www.cpsagu.com Curry Seed - Eric Solberg phone: 605-356-3366 e-mail: [email protected] website: www.curryseed.com Dairyland Seed phone: 800-236-0163 e-mail: [email protected] website: www.dairylandseed.com DuPont Pioneer - Troy Bauer phone: 515-418-0078 e-mail: [email protected] website: www.pioneer.com Federal Hybrids, Inc. - Dan Swalla phone: 712-830-9742 e-mail: [email protected] website: www.federalhybrids.com Great Lakes Hybrids (GLH) - David Hoy phone: 800-257-7333 e-mail: [email protected] website: www.greatlakeshybrids.com

Green Valley Seed - Jeff Dowdall phone: 660-727-3341 e-mail: [email protected] website: www.gvseed.com Hoegemeyer Hybrids - Ryan Spurgeon phone: 402-720-9385 e-mail: [email protected] website: www.therightseed.com GROWMARK (FS HiSOY) - Ken Martin phone: 309-737-5576 e-mail: [email protected] website: www.fsseed.com/midwest Iowa State University - Greg Gebhart phone: 515-294-5896 e-mail: [email protected] Jacobsen Seed - Dave Nelson phone: 712-665-2841 e-mail: [email protected] website: www.jacobsenseed.com Kruger Seeds - Neal Borgmeyer phone: 515-238-4572 e-mail: [email protected] website: www.krugerseed.com Latham Hi-Tech Seeds - Mark C. Grundmeier phone: 800-798-3258 e-mail: [email protected] website: www.lathamseeds.com Legacy Seeds, Inc. - Jim Wold phone: 866-791- 6390 e-mail: [email protected] website: www.legacyseeds.com LG Seeds - Greg Peters phone: 515-370-3377 e-mail: [email protected] website: www.lgseeds.com Merschman Seeds - Brian McKillip phone: 319-837-6111 e-mail: [email protected] website: www.merschmanseeds.com

MFA Incorporated (MorSoy) - Brian Anderson phone: 573-876-5363 e-mail: [email protected] website: www.morsoy.com Monsanto (Asgrow) - George Kadrmas phone: 319-350-0744 e-mail: [email protected] website: www.asgrowanddekalb.com Mycogen Seeds - Josh Enderson phone: 515-851-5144 e-mail: [email protected] website: www.mycogen.com NuTech Seed, LLC - Steve Sick phone: 515-232-1997 e-mail: [email protected] website: www.yieldleader.com Prairie Brand Seeds - Ben Fisher phone: 800-544-8751 e-mail: [email protected] website: www.prairiebrandseed.com Schillinger Genetics (eMerge) - Corey Nikkel phone: 515-225-6164 e-mail: [email protected] website: www.emergegenetics.com Stine Seed Company - Brian Hartman phone: 515-677-2605 e-mail: [email protected] website: www.stineseed.com Syngenta Seeds (NK) - Tom Hall phone: 612-710-8871 e-mail: [email protected] website: www.nksoybeans.com Wensman Seed Company - Kyle Kepner phone: 320-760-4369 e-mail: [email protected] website: www.wensmanseed.com

… and justice for all The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or part of an individual’s income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA's TARGET Center at 202-720-2600 (voice and TDD). To file a complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue SW, Washington, DC 20250-9410, or call 800-795-3272 (voice) or 202-720-6382 (TDD). USDA is an equal opportunity provider and employer.

Issued in furtherance of Cooperative Extension work, Acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture. Cathann A. Kress, director, Cooperative Extension Service, Iowa State University of Science and Technology, Ames, Iowa.

Evaluation of Soybean Varieties Resistant to Soybean Cyst ... · Evaluation of Soybean Varieties Resistant to Soybean Cyst Nematode in Iowa—2015 Gregory L. Tylka, Gregory D. Gebhart,

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