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Spotted Wing Drosophila Update: October 13, 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

Spotted Wing Drosophila Trap Catch

Spotted Wing Drosophila Trap Catch, photo by Christina Hillier

Spotted wing drosophila populations are building up in some southern and coastal locations. Numbers at all sites remain at high enough levels to be of concern in any fields still picking fruit. The most significant increases this week occurred in Limerick, Wells, and Dresden. Other sites remained relatively stable or had slight decreases in numbers. There may still be a late season spike in fly counts if we get more moisture and weather coming up from the south, although very cold weather anticipated later this week may put an end to the harvest season for most fields. All fields could still experience significant infestations in ripening fruit, so management of spotted wing drosophila should continue until harvest is finished. A seven-day spray schedule of an appropriate insecticide should provide adequate control of the flies at this time. (See the New England Small Fruit Management Guide for more information and details.) Clean up any waste fruit, and keep the fields on a frequent harvest schedule to further reduce drosophila populations in a field.

Town Spotted Wing Drosophila weekly trap catch 9/22/15 Spotted Wing Drosophila weekly trap catch 10/2/15 Spotted Wing Drosophila weekly trap catch 10/8/15
Limington 65 354 202
Limerick 160 254 840
Wells 63 71 1392
Cape Elizabeth 175 233
Bowdoinham 151 129 78
Dresden* 306 945 1743
Freeport 359 28
Buxton 36 462 244
Livermore Falls 77 16 57
Mechanic Falls 13 140 122
Poland Spring 62 51
Monmouth* 338 403 99
Wales 266 143 17

*Not sprayed

Spotted Wing Drosophila Larvain in Raspberry

SWD Larvae in Raspberry, photo by David Handley

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

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

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