In this Issue:

VEGETABLE NEWS

Vegetable Insect Update

STRAWBERRY NEWS

Strawberry Sampling Data from MDA

Strawberry IPM Update plus Fungal Diseases and Inoculum

Slugs

APPLE NEWS

July 8, 2005 Minnesota Apple Growers Association (MAGA) Summer Tour

Weekly Trap Counts: June 13 - June 23, 2005

Apple Scab Infections

Insect, Pest Fact Sheets
Vol 2 No.8   June 27, 2005

Vegetable Insect Pest Update

Eric Burkness, Dept. of Entomology, University of Minnesota

Cabbage Looper Moth (click to enlarge)Cabbage Looper (CL): Despite finding our first CL egg last week in Rosemount , MN, we have yet to capture any adult moths in our pheromone traps at Rosemount. Even though the flight is earlier than normal, it appears to be a relatively low population that has made it into the state.

We were reminded again this week of the importance of sampling and the influence of rain events on cabbage pests. On June 17th we had 25% of plants infested with CL larvae (treatment threshold = 10%), in a follow up sample on June 21st the infestation had dropped to 6.5%. This drop in infestation level was caused by the heavy rainfall event that occurred across the state on June 20th. More frequent sampling can allow you to take advantage of these situations and reduce insecticide applications.

Potato Leafhopper (PLH): Populations of PLH continue to increase slightly in snap beans, and have exceeded the threshold of 1/sweep for snap beans at 3rd trifoliate to bud stages.in our research plots at Rosemount. As stated last week, we have not detected any PLH nymphs but expect nymphs to be present in the next week.

Striped Cucumber Beetle (SCB): SCB populations remain low at Rosemount with populations dropping under 0.05 SCB/plant in check plots. Fields that have in-furrow treatments of Admire and Platinum insecticides are free of SCB.

Bean Leaf Beetle (click to enlarge)Bean Leaf Beetle (BLB): Populations of BLB are finally starting to decline substantially in snap bean plots with a density range of 0-0.15 BLB/plant. This should be the end of the overwintering generation. First generation adults should begin to appear by mid July and at this time defoliation of late planted snap beans can be of concern as well as pod feeding on mature snap bean plantings.

 
European Corn Borer (ECB): Catches of ECB in blacklight traps continue to remain very low across Minnesota . As of June 21st degree-days at Rosemount are 848 (base >50°F). This puts us well past the peak of the 1st generation flight, which occurred at approximately 600 degree-days. We expect the start of the second flight of ECB to begin at approximately 1400 degree-days.

 

 

PLEASE NOTE:  There will be NO newsletter published for July 4.  We will resume publication for July 11 unless there is a MN State Government shutdown.  If this occurs, then a web version of the newsletter will be available on the U of MN VegEdge site in htm format at: www.vegedge.umn.edu/MNFruit&VegNews/mnindex.htm and will contain only vegetable related information.

 

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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.