IPM : Publications : 1999 Annual Report : Impact Assessment

1999 Integrated Pest Management Annual Report

Impact Assessment

Evaluations of the economic impact of significant pests of corn and soybeans were initiated at five University of Illinois Research and Education Centers. The pests monitored included European corn borer, gray leaf spot, soybean cyst nematode, brown stem rot, and western corn rootworm.

Differential varieties for the specific pests were planted in replicated trials to determine yield losses caused by damage from European corn borers, soybean cyst nematode, and brown stem rot. In recent studies, yield loss was significant at Monmouth (northwestern Illinois) for SCN and European corn borer and at Perry (west-central Illinois) for gray leaf spot.

Comparisons between untreated corn and corn treated with a systemic fungicide will be used to assess the impact of gray leaf spot on yield. Foliar disease ratings for gray leaf spot and brown stem rot also have been taken at each research center. In addition, infestation levels of SCN were determined at each site. At the conclusion of the growing season, yields will be determined.

To assist in tracking the spread of the biotype of the western corn rootworm that lays eggs in soybean fields (as well as corn fields), four outlying University of Illinois Agricultural Research Centers participated in a project in cooperation with the Illinois Natural History Survey.

Soybean sample

Corn sample

Corn, soybean and leaf samples provide valuable data for impact-assessment evaluation.

The research centers involved in the vial-trapping project are located outside the current problem area. Soybean fields and corn fields, adjacent to one another, were sampled using this method. Western corn rootworms were scarce in the soybean fields but were found in all the adjacent corn fields. Vial-trapping at two Champaign County locations, in the current problem area, found a greater abundance of western corn rootworms in soybean fields than in corn fields. For information on this project, visit our website at www.staff.uiuc.edu/~s-isard/index.html.

Contacts:

Emerson Nafziger, ednaf@uiuc.edu,
Crop Sciences

Eric Adee, adee@uiuc.edu,
Crop Sciences

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