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No. 16/July 12, 2002

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IN THIS ISSUE:
Japanese Beetles Are Relentless in Many Areas of Illinois
The numbers of reports about problems with Japanese beetles have escalated during the past couple of weeks, and the reports just keep on coming. The densities of this pest seem to be at an all-time high in many areas of Illinois. In some areas, Japanese beetles are showing up for the first time; defoliation of ornamentals and trees has been widespread, and defoliation of corn and soybeans continues.

Rootworm Insecticide Performance Is Poor in Some Areas of Illinois
During the past couple of weeks, we have received more than a typical number of reports of poor performance of soil insecticides for rootworm control. Although this is unfortunate, it's not very surprising. A whole lot of larvae survived and began feeding on corn plants when the root systems were not well established. In addition, the recent hot, dry weather has compromised efficacy of insecticides applied at planting time.

This article describes the 1-6 root-rating scale, developed at Iowa State University.

A Few Insect "Thumbnail" Reports
This article provides brief updates on the activities of corn leaf aphids, grape colaspis, grasshoppers, potato leafhoppers, southwestern corn borer moths, and twospotted spider mites.

Soybean Leaf Cupping
Reports have been received from across much of Illinois about soybean leaves that are cupped. This phenomenon is not unique to the 2002 growing season, and soybean leaf cupping has been a common occurrence for several years.

The most difficult issue to determine with respect to cupped soybean leaves is identifying the cause or causal agent(s). This article presents several theories that have been proposed by weed scientists across states in the north-central region.

Stresses Build on Crops
Prospects for the 2002 corn crop in Illinois are starting to be seriously compromised by weather. This article discusses the following questions:

How much has the corn crop been hurt so far?
Is it the heat or the dryness that's causing the problem?
How much longer can the crop "hold out"?
Is there anything we can do?
Is there anything we should have done differently to prevent these problems?
What about soybean?

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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