In this Issue:
VEGETABLE NEWS
European Corn Borer Flight Ready for Take-off
Vegetable Insect Pest Update
STRAWBERRY NEWS
Strawberry Weekly Pest Sampling Data
APPLE NEWS
| Vol 3 No. 4 | June 2, 2006 |
Vegetable Insect Pest Update
Eric Burkness, Department of Entomology, University of Minnesota, St. Paul
After a week of above average temperatures, insect pest activity has noticeably increased. Both bean leaf beetle (BLB) and potato leafhopper (PLH) have been detected in snap beans in the Rosemount (Dakota Co.) area. BLB populations have remained relatively low, with 1 beetle/20 plants. However, PLH populations are somewhat higher with 0.4 PLH/sweep on snap beans at the 2nd trifoliate stage. The threshold for PLH on snap beans up to the 3rd trifoliate is 0.5/sweep. To detect treatable populations as soon as possible, you should intensify your scouting efforts this week.
As expected, the first European corn borer (ECB) moths were captured in a blacklight trap in Rosemount, MN on Tuesday, May 30. The flight of 1st spring moths should begin at 374 degree days (base 50°F). This threshold was exceeded on May 29. See Bill Hutchison's article in this issue for further details on the 1st generation flight of ECB.
 Dead SCB next to a cucumber plant treated with Admire |
A striped cucumber beetle (SCB) infestation was detected this week in Rosemount , MN on cotyledon to 1st leaf stage cucumbers. This is a little earlier than we typically expect to see SCB activity and may be a reflection of high overwintering survivorship due to the mild winter. A potential management option for SCB that has shown promise is the use of systemic insecticides Admire and Platinum as in-furrow treatments (please consult the label for proper use and/or restrictions for these insecticides). In a cucumber field treated with Admire, plant samples indicated a population of 1.25 live beetles/plant, and 0.6 dead beetles/plant (see picture). Even though there were a high percentage of plants with damage (see picture), the high level of dead beetles suggests that the treatment is working. We will continue to monitor this field to provide updates on the efficacy of this treatment option. |
 SCB and feeding damage on cucumber plant |
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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