In this Issue:
GUEST ARTICLE
Food Alliance - IPM at the State Fair!?!
VEGETABLE NEWS
GRAPE NEWS
Grape Pest Update
STRAWBERRY NEWS
APPLE NEWS
WEB SITES
| Vol 2 No.13 | August 22 , 2005 |
Grape Pest Update
T.L. Galvan and E.C. Burkness, University of Minnesota
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Since the ripening process of grapes is taking off, the sugar content level jumped from 5-8 two weeks ago to 15-18 degrees Brix this week. With an increase in the sugar level, the berries become more susceptible to splitting. This natural damage in the berries provides the conditions needed by the multicolored Asian lady beetle (MALB) to feed within berries and clusters, and cause additional damage. With these events that have occurred in the last two weeks, we have seen an increase in MALB population densities in most of the vineyards that we are sampling. However, most of the MALB in the vineyards have been found on the yellow sticky cards and only few of them in the clusters. We will continue monitoring at several locations and provide updates in future newsletter issues. |
| Grape berry with splitting damage | |
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MALB is a contaminant pest and its presence in the vineyard throughout the growing season does not affect grape yields. As many growers know, the presence of MALB and several alkaloid compounds released via reflex bleeding (and/or crushing of beetles) taints the resulting juice/wine with a "burnt peanut butter smell" and distasteful flavors. Therefore, insecticides should not be applied until close to harvest. Sevin (carbaryl) has shown good control of these beetles and, because it has a 7-day pre-harvest interval (PHI ), it is currently the best labeled insecticide option. Other insecticides that may provide some control, closer to harvest, include: Malathion (3-day PHI) and Provado (imidacloprid, 1-day PHI). However, our research with these two products is still underway. |
| MALB feeding on damaged grapes |
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/
Partial funding for this publication is provided through partnership agreements with the Minnesota Fruit and Vegetable Growers Association (MFVGA) and the United States Department of Agriculture – Risk Management Agency (RMA). These institutions are equal opportunity providers.
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