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No. 23/October 04, 2002

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Preharvest Intervals for Soybean Insecticides
Although several insecticides are labeled for control of bean leaf beetles in soybeans, not all of them should be used against the second generation of beetles that occurs in late summer. This article includes the preharvest intervals and related remarks for several insecticides labeled for use on soybeans.

Note that it is illegal to harvest soybeans before the preharvest interval of a specific insecticide has elapsed. And growers bear the burden for this if they do.

Corn Rootworm Larval Injury Following Wheat Observed in Lake County
How far north has the variant western corn rootworm spread in Illinois? This question is often raised by producers located in northern Illinois who want to know how much longer they can depend on crop rotation as an effective management tool to prevent larval injury by corn rootworms.

Our observations indicate that producers as far north as Lake County can no longer rely on crop rotation as an effective management tactic to prevent corn rootworm larval injury.

Annual Fall Survey of European Corn Borers Is Under Way
Extension entomologists are coordinating the annual fall survey of European corn borers in Illinois. Several Extension and research specialists and Extension educators began sampling cornfields in September, and the survey will continue until all designated counties have been sampled.

Be Vigilant About Herbicide Persistence
Adverse growing conditions were common across much of Illinois during the 2002 growing season. Dry soil conditions contributed to problems not only this season but may also impact rotational crops in 2003 due to persistence of herbicide residues in the soil.

For producers intending to plant wheat this fall, please remember that many corn and soybean herbicide labels have rotational intervals for wheat as well.

Getting a Start on Weed Control in the Fall
Over the past couple of years, the practice of applying herbicides in the fall to control winter annual weeds has gained widespread popularity. Since 1999 a number of products labeled for fall applications have been introduced. With this increase in products has come an increase in interest from many producers.

This article describes the potential benefits may be realized from controlling winter annual and simple perennial weeds in the fall. It also discusses basic approaches to fall herbicide applications and presents the results of experiments to examine the efficacy and timing of fall-applied soybean herbicides.

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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