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No. 14/June 28, 2002

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Vigilance for European Corn Borer Escalates
During the week of June 17, the number of reports of infestations of first-generation European corn borers increased considerably. The heaviest infestations (most of them subeconomic) seem to be in western counties right now, with lighter infestations reported elsewhere.

Based on recent observations, European corn borer larvae in the southern half of the state probably are beyond control with insecticides by now. In central and north-central counties, many larvae still are feeding in whorls. If control is warranted, time remains to get results. In northern Illinois, people should be scouting for corn borers for the next week and a half.

Corn Rootworm Larvae and Rescue Treatments
At this point in the summer, reports of corn rootworm larvae are becoming more common. In the coming weeks, following the emergence of western corn rootworm adults, it will make very good sense to monitor densities of this pest in soybean fields. This article discusses rescue treatments for corn rootworm larvae.

Lorsban 15G and Callisto Herbicide
Dow AgroSciences has issued a FIFRA Section 2(ee) label for Lorsban 15G.

Watch for Increasing Densities of Soybean Aphids During the Next Month
Findings of soybean aphids have continued throughout the upper Midwest during the past week. During the next month, everyone should keep their eyes on the growth of populations of soybean aphids.

This article describes the recommended steps for monitoring soybean aphid populations in Illinois.

Japanese Beetle Reports Common in Soybeans and Cornfields
During the past week, we've received several reports of Japanese beetle infestations in corn, soybeans, and even rose gardens. This article answers a few commonly asked questions regarding the management of Japanese beetles in corn and soybeans, including the following:

What's the easiest way to identify Japanese beetles?
How long will Japanese beetles be around this summer?
What thresholds should be used in corn and soybean fields?
What products are labeled for control of Japanese beetles?

Numbers of Grasshoppers Are Significant in Some Areas
The numbers of grasshopper nymphs being found around the edges of crop fields suggest that we need to pay attention to these avid herbivores this year. If the weather continues to be hot and dry, we can expect grasshoppers to become problematic in some areas.

This article contains information about grasshoppers and their management in Illinois. Topics covered include a description of the pest, its life history, the injury it causes, and scouting and management guidelines.

A Few "Thumbnail" Reports of Insects in Field Crops
This article contains some brief reports of occurrences of insects and mites in Illinois. Insects discussed include fungus beetles, grape colaspis, potato leafhoppers, and twospotted spider mites.

Postemergence Options for Waterhemp Management in Soybean
Questions about postemergence management of waterhemp in soybean are still common, so this article summarizes available management options, as well as some new findings related to this problematic weed species.

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 east-central, northern, and southern Illinois.

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

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