No. 11 Article 2/June 9, 2006

An Inventory of Field Crop Insect Issues in the Midwest

On June 6, extension entomologists from Illinois, Indiana, Iowa, Minnesota, Missouri, Nebraska, Ohio, and Wisconsin convened during a teleconference to share information about insect situations and issues in their eight respective states. A summary of the reports suggests a diversity of insect problems but no widespread outbreaks. Some common themes were the appearance of threatening numbers of armyworms in corn, wheat, and pastures in some areas; declining reports of black cutworm infestations; large densities of bean leaf beetles in some areas; and late-instar alfalfa weevils damaging alfalfa regrowing after the first harvest. Several entomologists noted that the low rates of seed-applied insecticides (Cruiser, Poncho) had not been very effective against black cutworms this spring.

Black cutworm larva and injury to lower portion of a cornstalk (photo courtesy of Robert Bellm, University of Illinois Extension).

Corn plant killed by black cutworm larva drilling into lower portion of stalk (photo courtesy of Robert Bellm, University of Illinois Extension).

Following are synopses of reports from the eight states:

Illinois (Mike Gray, Kevin Steffey)

Indiana (Christian Krupke, Purdue University)

Iowa (Marlin Rice, Iowa State University)

Minnesota (Ken Ostlie, University of Minnesota)

Missouri (Wayne Bailey, University of Missouri)

Nebraska (Bob Wright, University of Nebraska)

Ohio (Ron Hammond, Ohio State University)

Wisconsin (Eileen Cullen, University of Wisconsin)

We sincerely appreciate the time that the entomologists in neighboring states spent providing an overview of insect issues. We hope this inventory gives you a snapshot of insect issues around the Midwest. As always, please contact any of us if you have information to share. We all appreciate the input.--Kevin Steffey and Mike Gray

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