In this Issue:
Customer Awareness Series--Part 1
RISK & RISK MANAGEMENT
VEGETABLE NEWS
Snap Bean Seed Treatments and Seed Corn Maggot: Research update
Vegetable Insect Update
STRAWBERRY NEWS
APPLE NEWS
Insect, Pest Fact Sheets
| Vol 1 No.6 | June 14, 2004 |
Vegetable Insect Updates
Bill Hutchison and Eric Burkness, University of Minnesota, St. Paul
European corn borer: The first ECB moths of the first generation flight (2-generation strain) were caught this past week at Rosemount (Dakota Co.), as well as several other locations (St. James, Watonwan Co., Lamberton, Redwood Co.). Moth counts ranged from 1 to 5 at most locations. Significant egg-lay will not occur until June 9-14 at most locations; much of the sweet corn is still too small to be attractive for egg-lay. However, the earliest sweet corn fields will likely be at most risk for this first flight; the first generation flight is usually fairly strong through the end of June, but also smaller than the late-season flights. Reminder: We are continuously updating the Moth Flight web page with data from around the state - bookmark this site and refer to it for the latest ECB flight activity.
Seedcorn maggot: SCM damage continued to increase this past week on a May 18th planting date of snap beans, with 53-72% of the plants or seeds damaged in untreated check plots. We should note that these beans were purposely planted in a field that had received several applications of turkey manure during this past winter. Taking their cue this spring, SCM adult flies were clearly attracted to our seed treatment test plots (for more information on seed treatment results to date, see the research update article, this issue).
Potato Leafhopper: PLH counts increased significantly this past week at Rosemount, with the average number in alfalfa going from 1 to 98/100 sweeps. With much of the alfalfa (finally) getting cut this week, PLH will be moving to colonize new fields, including Potato and Snap Bean (and alfalfa). This past week, we found our first PLH adults in snap beans at Rosemount.
Bean Leaf Beetle: Adult feeding continued to increase this past week, with a third spray (May third planting) and a first spray (May 18th planting) required to protect snap bean plants from further damage. These results appear to confirm the relatively high survival rates we observed this past winter at Rosemount (see the May 31 article at: http://www.vegedge.umn.edu/MNFruit&VegNews/Vol1/531BLB.htm). Control should be considered if more than 10% of the seedlings in the cotyledon to first-trifoliate stages exhibit more than 25% defoliation (e.g., 6-10 "shot-holes" per leaf).
Striped Cucumber Beetle: Adults are still being caught on yellow sticky traps at Rosemount but populations on squash still remain relatively low with 0.3 beetles per plant. As in 2003, it would appear that the initial populations of striped cucumber beetles in south-central MN may be light. However, monitoring should continue as migrations into fields and population increases can occur rapidly.
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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Last Revised June 11, 2004.
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