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No. 16/July 13, 2001

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The Watch for Soybean Aphids Continues
Although we have received only one report of the occurrence of soybean aphids in Illinois, the numbers of this pest continue to increase in some fields. We have also received word from entomologists in other states that the soybean aphid has been found in Indiana, Ohio, and New York, and entomologists in Pennsylvania are searching.

Because of what happened last year (people being caught unaware by a "soybean aphid explosion"), some people want to treat early to avoid the buildups that occurred last year. Most entomologists strongly agree that we would do more harm than good by treating early.

Reports of Extensive Corn Rootworm Larval Injury Common
Reports of corn rootworm larval injury are becoming increasingly common. For those of you who are interested in evaluating the performance of your soil insecticide, there's no easy way to accomplish this task. Consider the use of the "old" Iowa State University 1-6 root-rating scale, described in this article.

Flights for Second Generations of Corn Borers Are Under Way
The flight of the moths that will lay eggs for the second generation of southwestern corn borers this year seems to be a bit ahead of schedule. As the next few weeks unfold, we will be better prepared to determine the potential for infestations of the second generation of both of these pests. So keep tabs on the moth flights, and be prepared to scout and treat if necessary. Knowing what egg masses and larvae look like will aid your scouting efforts.

More Aphids, but on Another Crop--Corn
The corn leaf aphid has been with us for years and can cause some significant injury during the late whorl and pollinating stages of growth. When environmental conditions are very hot and dry, corn leaf aphids can cause significant yield losses even after pollination is completed.

During the critical stage of pollination and shortly thereafter, monitor for corn leaf aphids in cornfields, especially in areas that are short on moisture.

Are We Looking at the Crops Right?
As most cornfields move into (and through) the pollination process, the questions continue about the "real" state of the crop. We notice that the percentage of the crop ranked as "good" or "excellent" is lower than it was last year at this time, and modest price rallies in the past 2 weeks suggest that many people have the expectation that this year's crop isn't quite "up to snuff." This article compares this year's conditions with last year's.

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, southern, and west-central Illinois.

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

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