In this Issue:
VEGETABLE NEWS
Vegetable Insect Summary for Minnesota - 2006: European corn borer and Corn earworm
GRAPE NEWS
Wine Grape Insect Summary for Minnesota and Northwestern Wisconsin - 2006: Beetles & Moths
STRAWBERRY NEWS
Fall Colors, Plant Health and Weed Control
APPLE NEWS
The USDA Cooperative Agricultural Pest Survey for Exotic Apple Pests in Minnesota
IPM PUBLICATION
New IPM Publication Series for Growers, Processors, Crop Consultants, & Extension Educators
| Vol 3 No. 12 | September 29, 2006 |
Wine Grape Insect Summary for Minnesota and Western Wisconsin - 2006: Beetles & Moths
Ted Galvan, Eric Burkness, and Bill Hutchison, Department of Entomology, University of Minnesota, St. Paul
During the 2006 grape season, growers did not have many problems regarding insect damage. The three most common insect pests in the Minnesota and western Wisconsin vineyards include the grape flea beetle (GFB), grape berry moth (GBM), and the multicolored Asian lady beetle (MALB). GFB is an early-season pest that feeds on buds from bud swell until the first leaf separates from the shoot tip. Once shoot growth reaches 3 inches, damage caused by the GFB normally does not affect yield. The densities of GFB in 2006 were low, compared to 2005, resulting in no need for insecticide application. GBM can be present in Minnesota vineyards throughout the growing season, but larval activity and late-season feeding on ripening berries is the primary concern. If larval infestations are high, economic losses may occur. GBM adults are monitored efficiently with pheromone traps. In 2006, the low moth flights (e.g., 2-4 moths/trap/week) did not result in significant larval infestations, and subsequent control measures were unnecessary.
 Fig. 1. MALB on grape cluster |
The most important insect pest in wine grapes in Minnesota and surrounding states is the multicolored Asian lady beetle (MALB; Fig.1). MALB is currently the only insect pest that requires close monitoring in Minnesota, since its damage can result in complete crop loss. Even though MALB is seen in the vineyard throughout the growing season, they start to aggregate in the clusters just a few weeks before harvest (Fig. 2). At this time growers should start a monitoring program to follow the infestation level, and to make appropriate treatment decisions. |
In 2006, the beetle infestations were low in most of the vineyards throughout Minnesota, and only a few growers made use of chemical control. Current insecticide options include, but are not restricted to: Sevin (carbaryl) with a pre-harvest interval (PHI) of 7 days, and Provado (imidacloprid) and Pyganic (pyrethrum) that can be applied on the day of harvest. In addition to these, Baythroid (cyfluthrin) with a 3-day PHI was recently labeled for wine grapes. Baythroid, as a pyrethroid, is known for its high toxicity to insects, including MALB, and for its long residual activity that also helps to provide control for several days following a spray. Baythroid is also a restricted use pesticide (RUP) that requires a pesticide applicator's license.
Editors Note:
For more information regarding Why, How and When to Monitor and Be Prepared for the MALB in Your Vineyard, check out the new 2006 Asian Lady Beetle Fact Sheet,
Wine Grapes in the Midwest: Reducing the Risk of the Multicolored Asian Lady Beetle.
You can also order this publication by calling the Minnesota Extension Service Distribution Center at; (612)-624-4900 or (800)-876-8636.
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.
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. ©1999-2006 Minnesota Extension Service, University of Minnesota. All rights reserved. Contact copyright@extension.umn.edu for information on reproduction or use of this material.