In this issue:

Pests of the Month

Vol. 2 No. 3		April 7, 2000

Pests of the Month

Giant ragweed (Ambrosia trifida) is one of the first annuals to emerge each spring. It occurs in cultivated fields, fence rows, and road ditches. It is most abundant in moist soil in low-lying areas. Giant ragweed also serves as an intermediate host for common stalk borer (Papaipema nebris). Upon emergence of sweet corn the stalk borer can migrate from giant ragweed and other weeds (e.g. several grass species) and infest young corn plants. This damage can be confused with European corn borer damage, but infestations of stalk borer commonly occur much earlier than the first generation of European corn borer. For more information on all major early-season caterpillars, see the Iowa State University web site at http://www. ipm.iastate.edu/ipm/icm/1999/5-31-1999/corncats.html.

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 April 6, 2000.
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