In this Issue:
VEGETABLE NEWS
Review and Recommendations for Late-Season Corn Earworm Control in Sweet Corn—2004
Corn Leaf Aphid Update from Illinois
Vegetable Insect Update
APPLE NEWS
A Stella is Born: How a Minnesota Apple Grower Developed an Apple of His Own
| Vol 1 No. 12 | August 9, 2004 |
Vegetable Insect Updates
Eric Burkness Suzanne Wold-Burkness, and Bill Hutchison, Dept. of Entomology, University of Minnesota, St. Paul, MN
Potato Leafhopper (PLH): In snap beans, adult PLH are on the decline, however populations remain slightly above or below the threshold (0.75-1.25/sweep). In addition, adult PLH counts in alfalfa dropped from 1/sweep in previous weeks to 0.14/sweep. Despite the drop in adult populations, nymph populations remain relatively high, with as many as 3 nymphs/leaflet in snap beans. PLH nymphs ranged from early to late instars, therefore nymph pressure could continue for the next 1-2 weeks.
Bean Leaf Beetle (BLB): First generation BLB are beginning to move into snap beans in Rosemount, with noticeable feeding damage (shot-holing). With most snap bean plantings reaching maturity (harvestable pods), the potential exists for BLB to feed on pods as well as foliage.
European corn borer (ECB): The ECB flight at Rosemount has remained low for the past 2 weeks, with a high of 2 moths per night caught in the BLT. For additional information see the 2004 Moth Flight site for up-to-date information on moth flights (http://vegedge.umn.edu/2004/moth.htm).
Corn earworm (CEW): We continue to see very low CEW trap catches across the state; however, it is beginning to increase in some locations with 6/night in Dodge Co., and 3/night near Rosemount (Dakota Co.).
Cabbage looper (CL): On late-planted cabbage, CL populations have increased to treatable levels at Rosemount. In untreated fields up to 40% of plants are infested with CL larvae, which exceeds the treatment threshold of 10% of the plants infested with CL larvae.
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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.
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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 August 5, 2004.
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