MN Fruit & Vegetable IPM News - Vol. 1, No. 7

European corn borer (ECB)--The first flight remains low throughout most of the state with some locations catching up to 28 moths in one night (see graph, below). However, degree days for ECB as of June 15th were at 613 which means the peak of the flight is either occurring now or will with in the next few days. For more recent updates on ECB, and other moth catch dynamics, see the 2004 Moth Flight site on VegEdge.

Corn earworm (CEW)--With CEW populations being established earlier than usual in southern portions of the Midwest (Illinois), the potential exists for CEW to arrive in MN earlier than normal. As a result of this early establishment, several locations in southern MN have caught a few CEW moths and this week at Rosemount we captured our first CEW moth in pheromone traps. In our experience, this early flight phenomenon seems to follow a 1 in 10 year pattern. We can expect the more normal CEW flight to occur in mid to late August. For additional information see the 2004 Moth Flight site for up-to-date information on moth flights.

Army Cutworm--As in southwestern MN (Lamberton; Bruce Potter), we have also trapped a few army cutworm moths at Rosemount. Army cutworm moths can be confused with the western bean cutworm (WBC), but WBC have a more contrasting white line near the front of the forewing and hind wings that are a brighter white, compared to army cutworm. In addition, we typically don’t expect WBC flights to occur until July. For photographs, and more info. see Bruce Potter's newsletter from June 11th.

Potato Leafhopper (PLH)--PLH counts remained relatively stable this past week at 0.67/sweep in Rosemount alfalfa that had not been cut yet. We have also observed PLH moving into snap beans but populations have been variable and nymphs are not present yet.

Bean leaf beetle (BLB)--Adult feeding continued in snap beans at Rosemount, with beetles beginning to move from heavily damaged plots to healthier plots. It appears that populations have started to decline. This decline in the overwintering population seems to typically occur around the end of June. Newly planted snap beans (June 4th) which emerged on June 11th are being damaged but defoliation is in the 10% range, much lower than earlier plantings were defoliation in untreated checks has exceeded 90%.

Striped cucumber beetle (SCB)--Populations of SCB are still showing up in newly planted cucurbits in Rosemount. However, populations have remained relatively low with 0.2 SCB per plant.

Return to index

ACKNOWLEDGEMENTS

Co-Editors: Bill Hutchison, Department of Entomology, University of Minnesota, hutch002@umn.edu
Jeanne Ciborowski, Minnesota Department of Agriculture, Ag. Resources Division,jeanne.ciborowski@state.mn.us
Suzanne Wold-Burkness, Department of Entomology, University of Minnesota, woldx018@umn.edu

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., Tuesday 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/default.htm

Partial funding for this publication is provided through partnership agreements with the Minnesota Fruit and Vegetable Growers Association and the United States Department of Agriculture – Risk Management Agency (RMA) and the RMA Community Outreach and Assistance Partnership Program. These institutions are equal opportunity providers.

DISCLAIMER

References 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.

Last Revised June 17, 2004.
The University, including the Minnesota Extension Service, is an equal opportunity educator and employer. ©1999-2004 Minnesota Extension Service, University of Minnesota. All rights reserved. Contact copyright@extension.umn.edu for information on reproduction or use of this material.