MN Fruit & Vegetable IPM News - Vol. 4, No. 5

Pest pressure has been light in cabbage in the Rosemount, MN (Dakota Co.) area this season. All cabbage now has at least 6 leaves, and there is no more evidence of flea beetle feeding. Early transplanted cabbage (cupping) had 10-20% of the plants with diamond back moth pupae (DBM) and there was little new damage. Especially at this time of year, when heavy rains are more common, frequent scouting can allow you to take advantage of rain events that can knock small to medium larvae off plants and kill them. If you have an infestation that is over threshold and have had a recent heavy rain event prior to applying an insecticide, it may be worthwhile to scout your cabbage field one more time prior to insecticide application to verify that the infestation is still present.

Potato leafhopper (PLH) populations have remained fairly high in alfalfa this week at 1/sweep. Populations in snap beans that were not treated last week have dropped to 0.1/sweep. Once again, this demonstrates the value and need for regular scouting trips to the field. As mentioned earlier, with the strong weather systems we can have this time of year; PLH populations can be blown in to and out of fields overnight and populations can decrease below threshold or increase above threshold in a very short time period. Another PLH factor to consider this time of year for snap beans is the first cutting of alfalfa that has been going on recently, as this can push the PLH population out of alfalfa and into adjacent crops.

Striped cucumber beetle (SCB) has not been detected so far this season in a Rosemount cucumber field at the 1^st true leaf stage.

European corn borer (ECB) populations have been very low across the state http://www.vegedge.umn.edu/2007/MNlist.htm). The peak first flight moth catch in our Rosemount black light trap was 5 moths/night. We’ll have to wait and see what this means for the size of the second flight population.

Corn earworm (CEW) moths continue to be captured in wire mesh pheromone traps at Rosemount but trap catch has been very low. The progress of CEW trap catch can also be viewed on the VegEdge website at http://www.vegedge.umn.edu/2007/CEW.htm

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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, 651-201-6217, jeanne.ciborowski@state.mn.us , MDA, 625 Robert St. North, St. Paul, MN 55155. 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/plants/pestmanagement/ipm/ipmnews.htm

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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Last Revised June, 2007 by woldx018@umn.edu
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