MN Fruit & Vegetable IPM News - Vol. 2, No. 4

Grape berry moth was caught in pheromone traps located in vineyards in Stillwater and Hastings, MN. The peak of the overwintering generation occurs at 190 degree-days (base 10° C). Therefore, based on the accumulated degree days to date in Stillwater (184) and Hastings (204), the adults found in the pheromone traps are from the overwintering generation. There are 2-3 generations in Minnesota. Because grapes are currently in the early stages of growth (bud swell to 5^th leaf separated), the overwintering generation is not likely responsible for damage to the ripening berries. However, the 1^st generation coincides with berry ripening, and is the primary source of damage to the berries.

Grape berry moth

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ACKNOWLEDGEMENTS

Co-Editors: Bill Hutchison ( hutch002@umn.edu), Department of Entomology, University of Minnesota, Jeanne Ciborowski, Minnesota Department of Agriculture, Ag. Resources Management and Development Division, and Suzanne Wold-Burkness ( woldx018@umn.edu), Department of Entomology, University of Minnesota

The Newsletter is published weekly from May through August, cooperatively, by the Minnesota Department of Agriculture (MDA) and the University of Minnesota (U of MN). Reports are posted on the U of MN and MDA web sites on Fridays. If you have suggestions and/or comments, please send your contributions by 4 p.m., Wednesday to Jeanne Ciborowski, 651-297-3217, jeanne.ciborowski@state.mn.us , MDA, 90 W. Plato Blvd., St. Paul, MN 55107-2094. You can access the Newsletter at the U of MN web site in htm format at: www.vegedge.umn.edu/MNFruit&VegNews/mnindex.htm and at the MDA web site in pdf format at: www.mda.state.mn.us/biocon/fruitreports/

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