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No. 23/October 03, 2003

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Mark Your Calendars for Two Latitude Bridge Programs
Programs on soybean aphids and pest resistance will be presented from extension offices by Latitude Bridge data conferencing on February 4, March 5, and March 12, 2004.

North Central Weed Science Society Meeting
The 58th meeting of the North Central Weed Science Society will be held December 1-4 in Louisville, Kentucky.

Learning More About the Effects of Soybean Aphids on Soybean Yields
Please use the form provided to share your experiences regarding the impact of soybean aphid on soybean yields in 2003. We hope to use the information to improve our treatment guidelines.

Results from 2003 On-Farm Survey for Rootworm Larval Damage in First-Year Corn
Data for 2002 and 2003 are presented to report rootworm larval damage in first-year corn in Illinois. Overall, this year's results revealed that the distribution of the variant western corn rootworm has spread farther northwest than was detected in 2002.

Bt Corn and Insect Resistance Management: Whither Refuges?
USDA has published disturbing findings that a number of Midwest growers are not following the insect resistance management requirements associated with Bt corn. Let's not make the same mistakes with Bt corn that we have made with overuse or misuse of insecticides.

European Corn Borer Survey Under Way
Word on the street is that densities of second-generation European corn borers are much smaller this year than they were in 2002. Survey details are available on the IPM Web site.

Charcoal Rot of Soybeans in Illinois: Primary or Secondary Disease?
Charcoal rot has been getting much attention in Illinois this year. Details are provided on symptoms, disease development, and management.

Test Weight and Yield: A Connection?
Low test weight and low yields are not specifically correlated, as some would surmise. The complex connections between conditions and yield for both corn and soybeans are described.

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

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

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