Managing Tropic Croton with Cadre/Ultra Blazer Tank-Mixes in Peanut E. P. Prostko and J. A. Kichler Dept. of Crop & Soil Sciences University of Georgia.

Managing Tropic Croton with Managing Tropic Croton with Cadre/Ultra Blazer Cadre/Ultra Blazer

Tank-Mixes in PeanutTank-Mixes in Peanut

E. P. Prostko and J. A. KichlerDept. of Crop & Soil Sciences

University of GeorgiaAPRESJuly 2003

Tropic Croton in PeanutTropic Croton in Peanut

3rd most troublesome weed

limited biology data NCSU competition

research less competitive than

other broadleaf weeds

Cadre in PeanutCadre in Peanut discovered (1981) field tested (1989) EUP’s (1993-95) labeled (1996) excellent control of nutsedge

complex G-E control of many other

species weak on tropic croton

Ultra Blazer in PeanutUltra Blazer in Peanut

registered (1982) formulation

changed in 2000 good on pigweed,

morningglory, ragweed, croton

6% of GA acres injury concerns

The Question?The Question?

What happens when you tank-mix Ultra Blazer and Cadre?

Cadre/Blazer Tank-MixesCadre/Blazer Tank-Mixes Source: Richburg et al., 1996Source: Richburg et al., 1996

53

7387 87

69

100 100

81

5764

9785

78

94100

82

0

20

40

60

80

100

Weed

Con

trol

- %

Cadre Cadre + Blazer

Cadre @ 1.0 ozs/A + Blazer @ 1 pt/A + X-77 @ 0.25% v/vApplied 3 WAP

Research Objective Research Objective

The objective of this research was to determine if tropic croton control with Cadre could be improved with tank-mixes of reduced rates of Ultra Blazer.

Materials & Methods - IMaterials & Methods - I on-farm (W. Dillard) Webster County small plot techniques 4 replications Georgia Green planted 4/30/02 crop injury weed control

Materials & Methods - IIMaterials & Methods - II

Cadre @ 1.44 ozs/A Ultra Blazer @ 24 ozs/A Cadre + Ultra Blazer @

* 2, 4, 8, 12, 16 ozs/A 80/20 @ 0.25% v/v 6.5 plants/ft2

* Test 1 = croton (< 1” tall)

* Test 2 = croton (5-6” tall)

ResultsResults

Peanut InjuryPeanut Injury

In both tests, the additions of Ultra Blazer to Cadre did not significantly increase peanut injury when compared to either herbicide applied alone.

Tropic Croton Control in Peanut - ITropic Croton Control in Peanut - I19 DAT19 DAT

5361

73

94 9591 89

0

20

40

60

80

100

Con

trol

(%

)

Cadre (1.44 ozs)Ultra Blazer (24 ozs)C + B (2 ozs)C + B (4 ozs)C + B (8 ozs)C + B (12 ozs)C + B (16 ozs)

Weeds < 1” Tall LSD 0.05 = 10

Tropic Croton Control in Peanut - ITropic Croton Control in Peanut - I84 DAT84 DAT

66 6673

7783

7483

0

20

40

60

80

100

Con

trol

(%

)

Cadre (1.44 ozs)Ultra Blazer (24 ozs)C + B (2 ozs)C + B (4 ozs)C + B (8 ozs)C + B (12 ozs)C + B (16 ozs)

Weeds < 1” Tall LSD 0.05 = 17

Tropic control control in peanut with Cadre + Ultra Blazer combinations applied to 1” tall weeds. A = untreated, B = Cadre @ 1.44 ozs/A + Ultra Blazer @ 8 ozs/A. Photos taken 19 DAT.

A B

Tropic Croton Control in Peanut - IITropic Croton Control in Peanut - II15 DAT15 DAT

5155

5968

76

96

64

0

20

40

60

80

100

Con

trol

(%

)

Cadre (1.44 ozs)Ultra Blazer (24 ozs)C + B (2 ozs)C + B (4 ozs)C + B (8 ozs)C + B (12 ozs)C + B (16 ozs)

Weeds 5-6” Tall LSD 0.05 = 6

Tropic Croton Control in Peanut - IITropic Croton Control in Peanut - II65 DAT65 DAT

33

23 24

3641

54

30

0

20

40

60

80

100

Con

trol

(%

)

Cadre (1.44 ozs)Ultra Blazer (24 ozs)C + B (2 ozs)C + B (4 ozs)C + B (8 ozs)C + B (12 ozs)C + B (16 ozs)

Weeds 5-6” Tall LSD 0.05 = 18

Tropic control control in peanut with Cadre + Ultra Blazer combinations applied to 5-6” tall weeds. A = untreated, B = Cadre @ 1.44 ozs/A + Ultra Blazer @ 16 ozs/A. Photos taken 15 DAT.

A B

Summary - ISummary - I

no significant increases in peanut injury were observed

when croton was 1” or less

* Improved control with Ultra Blazer at rates at or above 4 ozs/A

* Needed at least 8 ozs/A to provide control similar to full rate of Ultra Blazer

Summary - IISummary - II

when croton was 5-6” tall

* Improved control with Ultra Blazer at rates at or above 4 ozs/A but ……..

* tank-mixes were less effective than full rate of Ultra Blazer

Preliminary ResultsPreliminary Results20032003

Tropic Croton Control in Peanut - 2003Tropic Croton Control in Peanut - 2003Webster County -Webster County - 10 DAT10 DAT

5564

85

98 989893

0

20

40

60

80

100

Con

trol

(%

)

Cadre (1.44 ozs)Ultra Blazer (24 ozs)C + B (2 ozs)C + B (4 ozs)C + B (8 ozs)C + B (12 ozs)C + B (16 ozs)

Weeds 1-2” Tall LSD 0.05 = 9

Tropic Croton Control in Peanut - 2003Tropic Croton Control in Peanut - 2003Wilcox County -Wilcox County - 11 DAT11 DAT

58

71 74

8693

8981

0

20

40

60

80

100

Con

trol

(%

)

Cadre (1.44 ozs)Ultra Blazer (24 ozs)C + B (2 ozs)C + B (4 ozs)C + B (8 ozs)C + B (12 ozs)C + B (16 ozs)

Weeds 1-2” Tall LSD 0.05 = 9

University ofGeorgia

Extension Weed Science

(gaweed.com)