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Issue No. 14, Article 1/June 30, 2006

An Inventory of Field Crop Insect Issues in the Midwest

On June 27, extension entomologists from Illinois, Indiana, Iowa, and Wisconsin convened during a teleconference to share information about insect situations and issues in their respective states. A synopsis of the reports follows:

Illinois (Kevin Steffey, University of Illinois)

  • Western corn rootworm adults continue to emerge, although there are no reports of high numbers. Reports of severe rootworm larval damage are still relatively few.
  • Extremely large numbers of Japanese beetles are being found in corn and soybean fields in southern and central Illinois. Some insecticide applications are taking place.
  • Low numbers of soybean aphids exist in most fields, with some larger numbers on a few plants.

Indiana (Christian Krupke, Purdue University)

  • Densities of soybean aphids are very low.
  • Rootworm adults are showing up in corn, and some fields have large numbers of larvae.

Iowa (Marlin Rice, Iowa State University)

  • Densities of soybean aphids have declined from the previous week, from an average of about one per plant to less than one.
  • A couple of confirmed reports received (south-central and east-central Iowa) of imported longhorned weevils defoliating a few rows of soybeans.
  • First captures of western bean cutworm moths in traps were made on June 23. The previous earliest date of captures was June 28.

Wisconsin (Eileen Cullen, University of Wisconsin)

  • Counts of soybean aphids have been mostly zeroes. The largest numbers in any fields have been 10 to 20 aphids on scattered plants.
  • Garden symphylans are injuring corn in a few fields.
  • No captures of western bean cutworm moths are reported yet from the Wisconsin Department of Agriculture.

This inventory is intended to provide a snapshot of insect issues around the Midwest. As always, please contact any of us if you have information to share.--Kevin Steffey

Kevin Steffey

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