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Spotted Wing Drosophila Update: September 22, 2015

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Click on photos to enlarge.

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

Male and Female Spotted Wing Drosophila Flies

Male (left) and Female (right) Spotted Wing Drosophila, photo by Griffin Dill. Actual size: 2-3 mm.

There has not been a significant increase in spotted wing drosophila populations at most trapping sites this week, and in some locations captures were lower than last week. Hot, dry weather tends to reduce drosophila activity, as they prefer cooler, more humid conditions. However, populations in all sites are still high enough to cause significant infestations in ripening fruit, so management of spotted wing drosophila should remain a high priority for growers who are still harvesting. At this point, a five to seven day spray schedule of an appropriate insecticide should provide adequate control of the flies. (See the New England Small Fruit Management Guide for more information and details.) As the temperatures cool down and more rain moves into the state, it is likely that populations will increase. This will put increased pressure on the ripe fruit remaining, and more frequent sprays may become necessary to prevent infestations.

Town Spotted Wing Drosophila weekly trap catch 9/4/15 Spotted Wing Drosophila weekly trap catch 9/11/15 Spotted Wing Drosophila weekly trap catch 9/22/15
Limington 228 89 65
Limerick 23 217 160
Wells 35 69 63
Cape Elizabeth 399 1042
Bowdoinham 90 131 151
Dresden* 58 96 306
Nobleboro 111 53
Buxton 127 728 36
Livermore Falls 10 51 77
Mechanic Falls 11 55 13
Poland Spring 54 580
Monmouth* 1200 1217 338
Wales 108 221 266
Caribou 45

*Not sprayed

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

Spotted Wing Drosophila Larvae in Raspberry

Spotted Wing Drosophila Larvae in Raspberry, photo by David Handley

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

Other SWD websites:
Michigan State University
Pennsylvania State University
University of New Hampshire

Where brand names or company names are used it is for the reader’s information. No endorsement is implied nor is any discrimination intended against other products with similar ingredients. Always consult product labels for rates, application instructions and safety precautions. Users of these products assume all associated risks.

The University of Maine is an equal opportunity/affirmative action institution.

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