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No. 20/August 09, 2002

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The Insect Situation--An Overview
By this time of year, we have discussed, in some detail, a lot of what is occurring in the insect world in Illinois field crops. We have provided insect situation reports, scouting tips, economic thresholds, and suggested insecticides if such applications are necessary. Now, we just sit back and watch the insects and crops develop toward the end of another rather unusual season.

This article contains a brief update on corn rootworms, European corn borers, grasshoppers, soybean aphids, twospotted spider mites, and potato leafhoppers.

Alfalfa Webworms in Southern Illinois
Alfalfa webworms are distributed throughout southern Illinois, from the Mississippi River to the Wabash River. They caused damage to alfalfa in Illinois relatively infrequently, so their occurrence in large numbers this year is worthy of note.

Crazy Top in Corn
Crazy top has been showing up in a number of Illinois cornfields in the past few weeks. This disease appears to be fairly common in some areas due to the wet weather and flooding that occurred this spring.

This article contains a description of the symptoms of the disease and the pathogen that causes it, and suggestions for control.

Preharvest Restrictions for Postemergence Soybean Herbicide Applications
In certain parts of the state, herbicide applications are still being made to later-planted fields, double-cropped soybeans, and areas that may need a little cleanup from weed escapes. Knowing that a number of these fields will undoubtedly be treated for the first time or re-treated, some considerations need to be made when choosing a herbicide for that final application.

Regional Reports
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.

This week's issue includes reports from northern and west-central Illinois.

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

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