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No. 19/August 03, 2001

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Remember to Scout for Second-Generation European Corn Borers
During the past several days, we've received several reports that suggest that the second generation of European corn borers should not be neglected in some areas of Illinois. It's certainly worth the time to take out the management worksheet (included with the article) for the second generation of this pest and do some homework. In the worksheet, we offer some average numbers based on research data from many years and many states.

Links to Web sites with additional information about scouting for the second generation of European corn borers are also included.

Concerns about Soybean Aphids Escalate
Reports of densities of soybean aphids in soybean fields in Illinois have been quite variable, with densities ranging from very few to huge numbers. When should fields be treated for soybean aphids? We still hope to establish treatment guidelines soon, but it's not likely that we will have an honest-to-goodness economic threshold before the end of the season.

The article provides some suggested guidelines for when to treat soybean aphids in soybean fields.

Other Pests of Soybean Deserve Attention, Too
Matt Montgomery has observed relatively large numbers of bean leaf beetles and green cloverworms in soybean fields in his area. Both of these insects are defoliators that can cause significant loss of leaf tissue if they occur in large numbers.

Potato leafhoppers also are fairly common in soybean fields, as they have been in alfalfa fields. In fact, in some areas of the state, leafhoppers are causing significant injury to alfalfa, especially where soil moisture is low.

Sudden Death Syndrome Is Here
Sudden death syndrome (SDS) is being reported from several areas of the state. Weather conditions were favorable for SDS infection this spring in many areas of the state.

This article includes tips for diagnosis.

Pod and Stem Blight
Start looking for early signs of pod and stem blight in soybean fields now. Full-blown symptoms of pod and stem blight usually don't show up until late August and into September. That's a little late for seed producers to do anything to curb disease development.

This article tells how to identify the disease and includes a discussion of management options.

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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