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No. 20/August 10, 2001

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Western Corn Rootworm Densities Reach Alarming Levels in Rural and Urban Areas
That's right, urban areas. Russel Higgins received a report from a pest control firm in Chicago that indicated corn rootworm adults were being collected on the 49th and 50th floors of the Prudential Building. We've received other reports that indicate western corn rootworm adults are being washed up on the beaches of Lake Michigan at bothersome levels. Additional observations passed along to us from suburban residents indicate that "hordes" of western corn rootworm adults have devastated cucurbit and sweet corn crops produced within family gardens.

The intensity of corn rootworm injury experienced by many producers also was reflected in our soil insecticide trials this year. This article provides root ratings for our insecticide experiments that were located at DeKalb, Monmouth, and Urbana.

Soybean Aphids Are Headline News in Toronto
Last week, several Canadian newspapers featured the soybean aphids' invasion of Toronto. The airborne pests were so thick they caused home plate umpire Tim Welke to request the roof of the Skydome be closed during the third inning of the Toronto Blue Jays/Baltimore Orioles baseball game. William Babin reported, "They are so thick it almost looks as if the game is being played out during a light snowfall."

This article includes links to Web sites with more information on the soybean aphid invasion.

Remember to Submit your 2001 WCR Monitoring Data
Based on calls during the last several weeks, many of you are deploying Pherocon AM sticky traps in soybean fields to predict the need for soil insecticides in 2002 first-year corn. We encourage you to forward your monitoring data to us again this year.

Don't Underestimate Potential Impact of Insect Injury to Soybean Pods
The second week of August signals that it's time to begin checking soybean fields for pod injury that can be caused by a variety of insect pests. Bean leaf beetles, grasshoppers, and stink bugs are all able to cause yield losses in soybean fields during the pod-fill stage of development. So, although it has been a long, hot summer already, don't neglect to scout soybeans now and well through early September for these insect pests.

Diplodia Ear Rot of Corn
Diplodia ear rot was one of the most severe and noticeable diseases that affected corn in many parts of Illinois in the 2000 growing season. We have received questions concerning whether this ear rot disease will be common again this year. It is still too early in the season to typically see Diplodia ear or stalk rot in most of Illinois. We have, however, received reports of Diplodia ear rot in southern Indiana, and Diplodia stalk rot has been reported from east-central Illinois.

Although we don't have a good way to predict whether Diplodia ear rot will be a problem, a review of this disease may help to clarify some of the factors that contribute to its development.

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, southern, and west-central Illinois.

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

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