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Cooperative Extension at Highmoor Farm

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Spotted Wing Drosophila Alert: September 11, 2017


Click on photo to enlarge.

David Handley, Vegetable and Small Fruit Specialist; James Dill, Pest Management Specialist; Frank Drummond, Professor of Insect Ecology/Entomology

Our trap captures for spotted wing drosophila did not change significantly in most locations last week, meaning that populations are generally well over the tolerance level to prevent infestation of any soft fruit remaining in the fields. (See table below.) Growers with any susceptible ripening fruit need to continue protecting their crop against larval infestation. Only regular, consistent spray coverage will prevent fruit infestation. At this time, we continue to recommend a minimum spray interval of 5 to 7 days.

We do not expect populations to start to decline until the flies are exposed to several hard frosts. There is a possibility that any tropical storm fronts moving into the region could actually cause a significant increase in drosophila numbers. Keep harvesting ripe fruit regularly and remove all rotten or cull fruit from the field.

For more information on identifying spotted wing drosophila and updates on populations around the state, visit our SWD blog.

Other IPM Web Pages
Michigan State University
Penn State University
University of New Hampshire

David T. Handley
Vegetable and Small Fruit Specialist

Highmoor Farm                      Pest Management Office
P.O. Box 179                             491 College Avenue
Monmouth, ME 04259          Orono, ME 04473
207.933.2100                           1.800.287.0279

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Town Spotted Wing  Drosophila weekly trap catch 8/23/17 Spotted Wing  Drosophila weekly trap catch 8/31/17 Spotted Wing  Drosophila weekly trap catch 9/8/17
Wells 387 1256 273
Sanford 93 143
Limington 842 428 568
Limerick 217 237 326
Cape Elizabeth 4320 2968
New Gloucester 603 272
Bowdoinham 925 1448 449
Dresden 104 103 666
Freeport 40 56
Poland Spring 304 597 807
Mechanic Falls 16 65 77
Monmouth 415 681 434
Wales 1816 (2 weeks) 642 122
Farmington 1048 1552 1728



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Image Description: Spotted Wing Drosophila Emerging from Fall Raspberries


University of Maine Cooperative Extension

Contact Information

Cooperative Extension at Highmoor Farm
52 U.S. Route 202
Monmouth, Maine 04259-0179
Phone: 207.933.2100
The University of Maine
Orono, Maine 04469
A Member of the University of Maine System