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Spotted Wing Drosophila Alert: October 20, 2017

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Spotted Wing Drosophila Trap Catch

Spotted Wing Drosophila Trap Catch, photo by Christina Hillier


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

Trap counts of spotted wing drosophila rose dramatically in some locations over the past week. We are now finding fly numbers in the thousands at more than half of our trapping sites. (See table below.) All sites remain well over the threshold for larvae infestation if susceptible crops are not protected with regular sprays or netting. A spray interval of every 5 to 7 days should be adequate to prevent any marketable fruit remaining in the field from becoming infested. Continue harvest regularly and often, and keep overripe and rotten fruit out of the field as much as possible. Long range weather forecasts suggest continued warmer than normal temperatures ahead, which will both extend the late berry season and likely keep spotted wing drosophila pressure high.

Spotted Wing Drosophila Larvae in Raspberry

Spotted Wing Drosophila Larvae in Raspberry, photo by David Handley

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

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

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.

Town Spotted Wing Drosophila weekly trap catch 10/6/17 Spotted Wing Drosophila weekly trap catch 10/13/17 Spotted Wing Drosophila weekly trap catch 10/20/17
Wells 567 88 8664
Limington 87 152 3488
Limerick 1808 187 637
Cape Elizabeth 124 750 2424
New Gloucester 209 408 1272
Bowdoinham 563 244 1584
Dresden 4376 2816 3368
Freeport 133 655 407
Poland Spring 440 294 3504
Mechanic Falls 55 31 546
Monmouth 4696 1188 3368
Wales 343 372 325
Farmington 7568 5680 5112



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