MN - Vegetable IPM Newsletter

In this issue

Sweet Corn Insect Pest Updates

  • European corn borer
  • Corn earworm
  • Aphids

Cabbage Insect Pest Update

Where to Order Sweep Nets?

Vol. 2 No. 12   August 4, 2000

Sweet Corn Insect Pest Updates

Bill Hutchison and Eric Burkness, Dept. of Entomology, University of Minnesota, St. Paul, Minn.

The European corn borer (ECB) second generation moth flight is officially underway in southern Minnesota. ECB catch approached 90/night at Blue Earth, Minn. Trap catches at Rosemount increased from 2-3/night (late last week) to 25-50/night, on August 1st and 2nd, respectively, for the two traps we maintain at this site (see graph below for selected Minnesota sites). This matches well with the 1665 degree-day accumulation we are now at for Rosemount. Fields in green tassel to open (row) tassel and/or early silk stages will be attractive for egg-lay, and should be scouted carefully for ECB egg masses; the first ECB egg hatch was observed August 1st at Rosemount.

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Corn earworm (CEW) moth catch is still very low to nil at all Minnesota locations. Blue Earth and Rosemount sites have averaged only 1-2/week. The primary flight should not begin until approx. August 20th. Beginning next week, a new graph summarizing the CEW flight for several locations will be included in the newsletter.

Corn leaf aphid counts remain moderate to high in 'Jubilee' sweet corn (>25 to >100/tassel), with many several new adults colonizing fields that are either in early (green) tassel, or open (row) tassel growth stages. Although these infestations might cause problems, the early spray for ECB and/or CEW should help suppress populations.


Co-Editors: Bill Hutchison, Department of Entomology, University of Minnesota, hutch002@tc.umn.edu
Jeanne Ciborowski, IPM Program, Minnesota Department of Agriculture, jeanne.ciborowski@state.mn.us
Cindy Tong, Department of Horticulture, University of Minnesota, ctong@extension.umn.edu
Production Editor: Suzanne Wold, Research Specialist, University of Minnesota, woldx018@tc.umn.edu


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Last Revised August 8, 2000.
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