Pest Alert Updates

Bill Hutchison and Eric Burkness Extension Entomology, University of Minnesota, St. Paul, MN

Potato Leafhopper: PLH infestations continue to remain high (>5/sweep) in snap beans(and probably potatoes) in many areas of southern Minnesota; in many cases, PLH may be above economic thresholds. Leaves are dramatically "puckered" in untreated snap bean plots. For snap beans in traditional "bivoltine" (2-generation) European Corn Borer (ECB) areas, and with a lack of corn earwom (CEW) present, a spray just for PLH may be necessary. ECB moth flights for the univoltine strain are now active at some of the west-central MN trap sites; please see the BugWeb site on the web at: http://www.mnipm.umn.edu/dbforms/ecbnetwork/Find-A-Site/find-a-siteMN.asp The site is up and running for several MN locations (click on the red dot for the location of interest). During the past week, we have observed unusually high ECB moth counts for our Rosemount light traps ( up to 25/night, see graph). Trap catches for LeSueur, although lower (3-5/night) and Rosemount, suggest that the univoltine strain may be moving further east-central Minn.

We will soon have several sites available for CEW. CEW moth flights are still low, ranging from zero to 2 moths/week for most of southern MN (this is to be expected this time of year and good news!). CEW moth flights start building in August (southern WI, MN), and really take off beginning Aug. 20th (+/- 4 days); the late-season flight migrates into the upper midwest each year.

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Cabbage looper infestations continue to remain VERY HEAVY in southern MN. ONLY the HIGH RATES of the Pyrethroids should be used at this time (3/4" size worms are now present at Rosemoung; 75% of plants are infested in the untreated check plots).

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Cabbage looper larva

Co-Editors: Bill Hutchison, Department of Entomology, University of Minnesota, hutch002@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 July 19, 2001.
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