UW-Madison, IPCM Programs Sessions Purpose? There are two goals to this session. There are two goals to this session. 1.Evaluate your current practices.

UW-Madison, IPCM ProgramsUW-Madison, IPCM Programs

Session’s Purpose?Session’s Purpose?

There are two goals to this session.There are two goals to this session.1.1.Evaluate your current practices.Evaluate your current practices.

2.2.Learn what changes you can easily make.Learn what changes you can easily make. This is a self assessment.This is a self assessment.

– The worksheet will not be collected.The worksheet will not be collected.– Be honest with your answers.Be honest with your answers.– Ask questions as we go along.Ask questions as we go along.


Four areas of assessmentFour areas of assessment

General Crop ManagementGeneral Crop Management Weed ManagementWeed Management Insect ManagementInsect Management Disease ManagementDisease Management

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Assessment WorksheetAssessment Worksheet

Diagram of worksheet here. Diagram of worksheet here. Explanation of how to fill it out.Explanation of how to fill it out.


Insect ManagementInsect ManagementWhat is Your Insect Management

Philosophy– Complete Insect Control???

Control costs < damage

– Don’t control insects at all???Could suffer economic loss

– Same insecticide treatments each year??? Insect populations fluctuate

– Keep populations below economic thresholdsMost economically and environmentally sound


Insect ManagementInsect Management

Improper Identification– Can increase control costs– Can increase amount of insect damage– Can kill beneficial insects– Can lead to insecticide resistance


Cooperative Pest Survey Cooperative Pest Survey BulletinBulletin

•Free from WI Dept. of Ag.

•Weekly assessment of insects and diseases

•Doesn’t take the place of scouting

•Does remind you to scout



Scouting Records– Helps identify fields, which overtime, might

need preventive controls or special treatmentWirewormWhite grubStalk borerHop vine borer


Insect ManagementInsect ManagementWhy scout seedling corn for white grub,

wireworm and seed corn maggot if rescue treatments aren’t available?– Develop field histories for preventive control

measures– Identifies actual problem if you have reduced

plant stands



Black cutworm scouting– Start scouting at emergence– Most susceptible fields

Corn after soybeansLow areas of fieldWeedy field

– Scout at weekly intervals until V4-V5



First Generation European corn borer– Use Pest Survey Bulletin to schedule first visit– Early planted fields most susceptible– Scout at weekly intervals until threat is over– Look for “shotholing” in new leaves– Pull whorl leaves & count larvae

(5% loss/larvae)

– Monitor Bt corn for resistance



Second Generation European Corn Borer– Use Pest Survey Bulletin to schedule first visit– Late planted fields most susceptible– Scout at weekly intervals until threat is over– Count egg masses – Monitor Bt corn for resistance



Using European corn borer scouting information to schedule harvests– Protect against harvest losses caused by

Stalk tunneling Stalk rots

– Use information from first and second generation

– Harvest heavily damaged fields first (if you have a choice)



Scouting for corn rootworm beetles can predict next years damage potential– Scout during egg laying period (mid-August

to early-September)– 1-3 visits are necessary– Treat or rotate if you average > 0.75

beetles/plant



Granular Insecticides for first year corn??In Wisconsin, Female corn rootworms lay

eggs in corn (some exceptions in IL, IN, MI)


Insect ManagmentInsect Managment

Using below labeled rates of Counter, Force and Lorsban to control rootworms under light to moderate populations– Up to 25% rate reduction for rootworms– Scientific data from North Central Region is

encouraging– Proper calibration is a must– No product “guarantee” from company



A benefit of weed control is improved insect management

Wireworm White Grub

Stalk borer Black cutworm

Armyworm Slugs

Hop vine borer Billbug



Soil Insecticide Calibration– Calibration saves $ – Don’t use book values from operators manual

or insecticide label– Calibrate each row of the planter– Company reps will (want to) help



Bt hybrid selection– Based on probability of damage on your farm

Scouting data from previous yearsFollow up loss estimates

– 5% loss/first generation larvae

– 4% loss/second generation larvae



Insect Resistance Management for European corn borer– Real concern – 20% Non-Bt Refuge, No hybrid restrictions – Refuge must be within 1/2 mile of Bt corn, 1/4 mile if you

want to maintain option to spray refuge – Refuge can be treated if economically justified. If refuge

areas are to be treated for corn borers, microbial Bt foliar sprays are not to be used.

– IRM plant for rootworm resistant hybrids will be different


Disease ManagementDisease Management



Northern Corn Northern Corn Leaf BlightLeaf Blight

AnthracnoseAnthracnose

Yellow Leaf Yellow Leaf BlightBlight

Grey Leaf SpotGrey Leaf Spot



Northern Corn Northern Corn Leaf BlightLeaf Blight

AnthracnoseAnthracnose

Yellow Leaf Blight Yellow Leaf Blight

Grey Leaf SpotGrey Leaf Spot


Where to get help for Where to get help for corn disease IDcorn disease ID

County Extension Agents UW Plant Disease Clinic & Web site

http://www.plantpath.wisc.edu/pddc/ Integrated crop and pest management website

http://ipcm.wisc.edu Cooperative Extension Publications

– A3646 Pest Management In WI Field Crops

– A7800603 Corn Disease I (Picture Sheet)

– A7800604 Corn Disease II (Picture Sheet)


Disease ManagementDisease ManagementApril May June July Aug. Sept. Oct.

Seed Rots

Seedling Blights

Anthracnose Leaf Blight

Anthracnose Stalk Rot

Nematodes

Common Rust

Northern Corn Leaf Blight

Northern Corn Leaf Spot

Grey Leaf Spot

Goss’s Bacterial Wilt & Blight

Eye Spot

Fusarium & GibberellaEar Rot

Fusarium & Gibberella Stalk Rot


Seed Treatment is Seed Treatment is more than colormore than color

Captan-Widely used borad spectrum contact fungicide, however, poor on pythium and very dusty.

Metalaxyl-Narrow spectrum systemic fungicide with excellent activity against Pythium

Fludioxonil-broad spectrum contact fungicide, very effective against Fusarium, but poor Pythium activity.


Plant StressesPlant StressesAugust Leaf diseases Insect feeding Hail injury Low soil fertility Compaction Etc.

August/September High soil moisture

Increased Pythium Root Infection

Premature plant death-rotting stalks

-Lodged plants


Time to total your score.Time to total your score.

Sum each category separately.Sum each category separately. Sum each category.Sum each category. Pass in your scores. DO NOT put your Pass in your scores. DO NOT put your

name on them.name on them.


SummarySummary

You should have a good idea where you You should have a good idea where you stand in the IPM continuum.stand in the IPM continuum.

You should have an idea of what options You should have an idea of what options you can use.you can use.

Remember to make small changes and Remember to make small changes and evaluate the time, labor and profit.evaluate the time, labor and profit.


Where to Get More InformationWhere to Get More Information

http://ipcm.wisc.edu/http://ipcm.wisc.edu/ Wisconsin Crop ManagerWisconsin Crop Manager Wisconsin Pest Survey BulletinWisconsin Pest Survey Bulletin Your local Cooperative Extension officeYour local Cooperative Extension office Consulting services, other sourcesConsulting services, other sources



This program is an effort of the This program is an effort of the University of Wisconsin’s Integrated Pest and University of Wisconsin’s Integrated Pest and

Crop Management ProgramsCrop Management Programs with funding provided by the with funding provided by the

Pesticide Use and Risk Reduction Project.Pesticide Use and Risk Reduction Project.

UW-Madison, IPCM Programs Sessions Purpose? There are two goals to this session. There are two goals to this session. 1.Evaluate your current practices.

Documents

ipcm programs insect

insect damage

insect populations

ipcm programs sessions

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