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No. 09/May 25, 2001

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Field Crop Session to Focus on Drift
Crop producers, agribusiness dealers, and crop scouts are invited to participate in a workshop titled "Managing Herbicide Drift and Injury" on June 7. The focus of the workshop will be on strategies to reduce herbicide drift on agronomic and ornamental plants.

Will 2001 Be the Year of Lepidoptera?
Although we may never know all of the reasons for the success of moth pests to date this year, it's obvious that conditions have been conducive for survival and development of Lepidoptera, the insect order that includes moths and butterflies. Obviously the moths found conditions suitable for egg laying after they arrived. And their progeny, the larvae causing all of the damage, have found conditions to be to their liking.

Among all the other concerns about growing crops in Illinois, we need to pay particular attention to lepidopteran pests this year. Given our experiences thus far, we should keep our guard up for other caterpillar assaults.

The Armyworm Saga Continues
The armyworm outbreak of 2001 has been one for the record books. Many people who have called on the telephone or sent e-mail messages have asked the same questions about armyworms, among which are the following:

Why have armyworms been so bad this year?
How much longer will armyworms be around?
How will the recent cool temperatures affect the armyworms?
Are natural enemies slowing armyworms down any?
Will we have to deal with armyworms any more this year?
What insecticides are effective against armyworms?

This article addresses these questions. The article also offers strongly worded advice about which insecticides can be used for different crops.

Variegated Cutworms Ravage Soybeans
Some of the problems in soybeans that have been blamed on armyworms were probably caused by variegated cutworms. This article describes the variegated cutworm and offers suggestions for control.

Soybean Aphids Found in Illinois--This Time for Certain
After my initial questionable report of the first soybean aphids found in Illinois, I wrote a warning in last week's Bulletin about jumping to conclusions regarding identification of aphids. Well, now the waiting is over. We have confirmed identification of soybean aphids that were collected in Whiteside County on May 10. So, at long last, after lots of searching, we know that at least some soybean aphids made it through the winter.

So now that we know that soybean aphids are "awake," we will increase our vigil.

An Early Warning about Twospotted Spider Mites
The recent rainfall in many areas of Illinois probably has dissipated thoughts of droughts and the problems that frequently accompany hot, dry weather. However, areas in southern Illinois still are lacking moisture, and a return to hotter weather will re-invigorate concerns. That's why it's important to report about the first observation of twospotted spider mites in Illinois this year.

What's Causing Spots on My Corn?
This season has started out a little slow as far as diseases are concerned. However, things that might start appearing in the field with the cool wet weather are root rots and seedling blights. This article addresses Stewart's bacterial wilt and holcus spot, and discusses look-alikes such as anthracnose and drift or contact from chemicals, such as paraquat or glyphosate.

Considerations with Postemergence Corn Herbicides
This article contains are several considerations for postemergence corn herbicide applications that should be kept in mind whether you've had too little or too much precipitation.

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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