Spotted Wing Drosophila Alert: 10/7/2022
David Handley, Vegetable and Small Fruit Specialist; James Dill, Pest Management Specialist, Phil Fanning, Assistant Professor of Agricultural Entomology, Christina Howard, New Farmers Program Manager
Spotted wing drosophila fly counts have again dropped at nearly all sites this week. One site in Limington is now below the spray threshold of six flies per trap per week. This is the first time populations have been this low at this point in the season since we started statewide trapping in 2012. However, the numbers are still high enough at most sites enough to infest late-ripening fruit. Fly numbers could increase in the coming weeks, although recent frosts are bringing an end to the harvest season at some farms.
A 5-7-day spray schedule is recommended on all soft-fruited crops, including fall raspberries, blackberries, and day-neutral strawberries, where populations exceed the threshold of more than six flies caught in a week. Removing rotten fruit from the fields that are still being harvested can significantly reduce drosophila numbers, so keep waste fruit off the ground as much as possible.
For more information on identifying spotted wing drosophila (SWD) and updates on populations around the state, visit our SWD blog at: https://extension.umaine.edu/highmoor/blog/tag/spotted-wing-drosophila/.
Other IPM Web Pages
Michigan State University: http://www.canr.msu.edu/ipm/invasive_species/spotted_wing_drosophila/
Penn State University: https://extension.psu.edu/spotted-wing-drosophila-part-1-overview-and-identification
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
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|Town||SWD weekly trap catch 9/16/22||SWD weekly trap catch 9/23/22||SWD weekly trap catch 9/30/22||SWD weekly trap catch 10/6/22|
Weekly spotted wing drosophila trap captures.