In this Issue:
VEGETABLE NEWS
Vegetable Insect Summary for Minnesota - 2006: European corn borer and Corn earworm
GRAPE NEWS
Wine Grape Insect Summary for Minnesota and Northwestern Wisconsin - 2006: Beetles & Moths
STRAWBERRY NEWS
Fall Colors, Plant Health and Weed Control
APPLE NEWS
The USDA Cooperative Agricultural Pest Survey for Exotic Apple Pests in Minnesota
Dogwood Borer in Minnesota
IPM PUBLICATION
New IPM Publication Series for Growers, Processors, Crop Consultants, & Extension Educators
| Vol 3 No. 12 | September 29, 2006 |
Dogwood Borer in Minnesota
Jean Ciborowski
This year, the MDA apple insect pest trapping program included dogwood borer (DWB) (Synanthedon scitula) as part of the group of insects monitored. The graph shows representative locations and numbers of adults trapped. All locations that were trapped for DWB, shown on the graph and those not included on the graph, were positive for this apple pest. The numbers of DWB adults varied from very low to high depending upon the location. For the most part, DWB adult counts were highest between May 15 and June 5, but continued to be found in traps throughout the entire growing season.
Dogwood borer larvae feed on burr knot tissue in the trunk. This type of feeding is characterized by the presence of brown frass on the surface of infested tree trunks. DWB rarely attacks a healthy tree with smooth undamaged bark. Injury is commonly observed on size-controlled rootstocks with burr knots (aggregations of root initials) or a heavily callused graft union. This explains why damage is more common in dwarf plantings.
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 Jean Ciborowski, 651-201-6217, jeanne.ciborowski@state.mn.us, MDA, 625 Robert St. North, St. Paul, MN 55155-2538. 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: http://www.mda.state.mn.us/ipm/ipmnews/
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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