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Regional Reports

May 25, 2001
Extension center educators, unit educators, and unit assistants in northern, west-central, east-central, and southern Illinois prepare regional reports to provide more localized insight into pest situations and crop conditions in Illinois. The reports will keep you up to date on situations in field and forage crops as they develop throughout the season. The regions have been defined broadly to include the agricultural statistics districts as designated by the Illinois Agricultural Statistics Service, with slight modifications:

· North (Northwest and Northeast districts, plus Stark and Marshall counties)

· West central (West and West Southwest districts, and Peoria, Woodford, Tazewell, Mason, Menard, and Logan counties from the Central district)

· East central (East and East Southeast districts [except Marion, Clay, Richland, and Lawrence counties], McLean, DeWitt, and Macon counties from the Central district)

· South (Southwest and Southeast districts, and Marion, Clay, Richland, and Lawrence counties from the East Southeast district)

We hope these reports will provide additional benefits for staying current as the season progresses.

East-Central Illinois

Planting has pretty well wrapped up. Some of the first emerging bean fields have been hit by bean leaf beetles.

There was one report of a no-till cornfield in wheat stubble that was being devastated by slugs.

By far the biggest problem has been armyworms, mostly in grass pastures and field borders but also in corn, wheat, and alfalfa.

Northern Illinois

The northwest corner of the state has soybeans yet to plant. Rainfall on May 21 ranged from 3/10 inch in the southeast portion of northern Illinois to 1-1/2 inches in the northwest corner.

Generally, soybean emergence to date has been uniform, following the same pattern as corn. Corn has been doing well all spring. However, cooler temperatures this week and, in some areas, dry conditions will slow corn development.

There have been several reports of insecticide treatments for black cutworms in corn, but it is definitely not a widespread problem. Also, bean leaf beetles have been frequently observed in soybean fields, but there have been no reported treatments.

Southern Illinois

Rains finally arrived in much of the region. Cooler temperatures are also prevailing.

The armyworm calls have not ended, but are fewer in number. Bean leaf beetle feeding can be observed in many soybean fields. European corn borer moths continue to fly.

Corn is VE to V6+ with most of the late April planting at V4 to V5. Soybean planters are running again. Grass and legume hay has been harvested or needs to be. Wheat is GS 11.2 dough and has colored to a lighter green.

West-Central Illinois

Most areas of the region received significant rain. Water is standing in some fields for the first time this spring.

Corn is growing rapidly after the rain; some fields are V6 and beyond. Postemergence herbicides, cultivation, and sidedressing nitrogen are occurring. Armyworms, wireworms, and grubs are the main insect pests reported. One farmer found six armyworms on one corn plant. Some soil-applied grass herbicides were not effective in some fields in dry soils, causing reapplication with a postmergence treatment.

Soybean planting will be completed very soon, now that moisture is available. Those fields planted look good, and postemergence herbicides will be applied very soon. Bean leaf beetle and seedling diseases are being reported.

Although wheat looked excellent early in the season, it has been overtaken by armyworms in some fields. Insecticides are being applied in many fields to salvage the flag leaf and head. One farmer indicated he was going to abandon the wheat crop and plant no-till soybeans now.

Some grass pastures are also being eaten by armyworms. Insecticide applications are being made to ensure recovery of the grass after rain.

The Pest Management and Crop Development Bulletin
Executive Editor: Kevin Steffey, Extension Entomologist

Subscription information: Phone (217) 244-5166 or email
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