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No. 21/August 28, 2003

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Last Seasonal Issue of the Bulletin for 2003
Issue numbers 22, 23, 24, and 25 will be published on September 5, October 3, November 7, and December 5, respectively. However, if necessary, we will provide updates to the Web version.

Reminder that Agronomy Day is August 21
The 47th Agronomy Day is Thursday, August 21. Admission is free. Four field tours begin at 7:00 a.m. and continue throughout the day. Lunch and refreshments will be available for purchase.

Workshop to Focus on Field Crop Disease Management
August 26. The workshop will be conducted at the Crops Training Center at the Northern Illinois Agronomy Research Center, Shabbona, from 9:00 a.m. to 3:00 p.m.; $50 per person, with reservations due by August 18.

Problems with Soybean Aphids South of I-80
From August 11 update: Heavy infestations of soybean aphids are now being reported in counties south of I-80. Monitoring should begin immediately in affected counties. Information is provided on economic thresholds, suggested insecticides and effectiveness, and application choices.

Some More Information About Soybean Aphids
Even more has happened with soybean aphids since the August 11 update. Apparently economic numbers of soybean aphids are being discovered in areas where they have not been noticed up to now.

Controlling Western Corn Rootworms in Soybeans: Confusion?
We do not recommend controlling western corn rootworm adults in soybeans to prevent egg laying. Beware of "consultants" with products to sell.

Another Soybean Defoliator
Reports of a large number of painted lady butterflies in ditches and roadsides in northwestern Illinois: When populations of thistle caterpillars are high, they may be an economic pest of soybean. Also, grasshoppers are being noticed in fairly large numbers across the state.

Nitrogen Carryover
Severe storms in some area of the state have resulted in crop damage that will markedly restrict potential yield of corn and soybeans. Questions have been raised about the potential for nitrogen carryover from fields that have reduced corn yield.

"Unusual" Inputs for Soybean: Why Now?
We have heard over the past several weeks many reports of "unusual" inputs that are being promoted and sold for soybean. Such products are almost always unproven, at least from the standpoint of having had enough careful research done to show that the product can be expected to provide a solid return on investment.

Regional Reports
Reports are provided in this issue for northern and west-central Illinois.

Soybean Aphids Continue Spreading Through Illinois
As we near the end of August, soybean aphids are still the main cause of concern in many soybean fields. The movement of winged aphids has brought these insects to all areas of the state. With many soybean plants in the later reproductive stages, producers should think twice about insecticide applications.

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

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