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No. 19/August 02, 2002

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Reports of Corn Rootworm Larval Injury Continue
As we begin August, observations of severe corn rootworm larval injury continue across northern Illinois. During the past week, rains have softened soils just enough to allow plants with poor root systems to lodge. In many of these fields, brace roots have been pruned by corn rootworm larvae. However, don't automatically begin "pointing" to corn rootworms as the only potential explanation for lodging.

Monitor Soybean Fields for Defoliators
By early August, soybean fields begin to support a diverse community of insect defoliators. During the early part of the reproductive stage, plants typically become more sensitive to defoliation. Defoliators to pay attention to in August include Japanese beetles, bean leaf beetles, grasshoppers, green cloverworms, and woollybear caterpillars.

Blister Beetles: Common Inhabitants of Alfalfa and Soybean Fields
At this point in the season, it's common to find these soft-bodied beetles in both alfalfa and soybean fields. Blister beetles rarely cause economic damage to alfalfa, but they can cause problems as a contaminant in baled hay.

Soybean Aphids: Reports of Economic Infestations Few and Far Between
Thus far, perhaps the biggest surprise of this summer has been the scarcity of reports concerning economic infestations of soybean aphids in Illinois fields. But overall, we've been fortunate across much of the state with respect to this new insect pest.

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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