MN Fruit & Vegetable IPM News - Vol. 2, No. 3

Seedcorn Maggot: As of May 17, the degree days for SCM were at 691 (base 39° F). The peak of the second generation flight should occur at 1170 degree days. Preliminary data from Rosemount, MN indicate that SCM seed damage may be light. As mentioned in last week’s newsletter we are monitoring adult SCM using baited traps (see table). Although we continue to catch SCM adults, we may be in between the first and second generation, therefore egg lay and/or larval presence may be low. However, with the current below normal temperatures, and slow seed germination/emergence, it could still be possible to see higher populations of SCM larvae (and seed damage) as we approach the peak of the second generation of adults.

Weekly average of SCM on sticky traps with or without lures, Rosemount, MN, 2005.
	Avg. number of SCM/trap
Date	Traps with lures	Traps without lures
5/2/05	4.2	1.0
5/9/05	53.4	6.2
5/16/05	47.4	9.4

European Corn Borer (ECB): As of May 17, the degree days for ECB at Rosemount, MN were at 284 (base 50° F). We expect to see the first ECB moths flying at approximately 374 degree days. We will report ECB numbers once moth catch begins in our black light traps in Rosemount, MN.

Potato leafhopper (PLH) and Bean leaf beetle (BLB): We have not detected either PLH or BLB in Rosemount. However, with the below normal temperatures we are experiencing this spring, few acres of vegetable crops have either been planted or emerged. Despite their absence, as temperatures begin to warm and the crops emerge, we expect to see infestations develop. We will provide updates as infestations occur.

Return to index

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.

DISCLAIMER

Reference to products in this publication is not intended to be an endorsement to the exclusion of others which may have similar uses. Any person using products listed in this publication assumes full responsibility for their use in accordance with current manufacturer directions.

The University, including the Minnesota Extension Service, is an equal opportunity educator and employer. ©1999-2005 Minnesota Extension Service, University of Minnesota. All rights reserved. Contact copyright@extension.umn.edu for information on reproduction or use of this material.