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Regional Reports

July 14, 2000
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

Growers venturing into soggy cornfields are reporting unusually high amounts of leaf rust, large numbers of Japanese beetles that are clipping silks, light levels of western corn rootworm beetle activity, and surprising amounts of corn-borer damage. However, none of these was reported at an economic damage level. See the previous two issues of the Bulletin for information on foliar diseases in corn.

The major concern in soybeans this week has been defoliation from Japanese beetles.

Producers trying to make hay have been frustrated with the recent rainy conditions.

Northern Illinois

Rain, rain, rain came in a steady stream, with amounts this past weekend of 1 to 5 inches depending on where you live.

Diseases in corn are beginning to generate many questions concerning the application of fungicides for control. The problem is that it takes many bushels to pay for the treatment because of low prices, and some individuals may pull the trigger too soon and have to decide about a second application.

Some phytophthora is beginning to show up in soybeans.

Insect problems are still low. A sweep on July 11 in 12-inch tall alfalfa in plots in Stephenson County averaged 0.5 leafhoppers per sweep, well below treatment thresholds. Many beneficial insects were in the sweep net with the leafhoppers.

Some potassium deficiencies are showing up in corn rows along the edge and, in some cases, other areas of the field.

Tasseling/silking of the corn crop is well under way.

Many yellow spots are showing in cornfields and soybean fields because of the wet field conditions.

Southern Illinois

Despite rain over the last 2 to 3 weeks, wheat harvest and double-crop bean plantings are proceeding well. In many cases, wheat has yielded better than expected. Corn is looking good throughout the area, with conventional corn a bit ahead of no-till. Some isolated pockets of southwestern and European corn borer infestation exist. European corn borer trap catches across the region are very low, but southwestern numbers are building as the second flight begins. Late-planted corn could be severely affected by southwestern corn borer. Beans look good, some disease pressure exists, and insect problems are limited. Grasshopper numbers are still high, but moisture and green grass have limited feeding on crops. There are some isolated reports of potato leafhopper damage in alfalfa.

West-Central Illinois

Rain continues to fall in most areas in the region, and all thoughts of a drought have ended.

Corn looks excellent, and fertilization in many fields is almost complete. The two problems observed in some fields are common rust and rootworm beetles, neither of which is a major problem. With warm, moist weather conditions, gray leaf spot may be a potential problem.

Soybeans are growing rapidly, and many fields are well into the reproductive stages. Water-damaged areas are prevalent in some fields, and SCN and SDS are the next potential problems.

Wheat yields were excellent, up to 90 bushels per acre in some areas.

Alfalfa harvest has been difficult due to wet conditions. Potato leafhopper numbers are increasing rapidly with the warm temperatures.

Farmers and agri-dealers have reported very few problems during the last week.

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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