Spotted Wing Drosophila Update: August 26, 2022
Spotted Wing Drosophila Alert: 8/26/2022
David Handley, Vegetable and Small Fruit Specialist; James Dill, Pest Management Specialist, Phil Fanning, Assistant Professor of Agricultural Entomology
Spotted wing drosophila fly counts were over the recommended control threshold at all of our scouting locations this week. Numbers at some sites have risen but most have remained relatively stable. At these levels, the flies should be controlled with regular sprays. We still anticipate exponential growth of fly numbers in the coming days.
All soft-fruited crops, including fall raspberries, blackberries, and day-neutral strawberries that are now being harvested need to be protected. Growers should maintain a 5-7-day spray schedule once fly numbers have exceeded the threshold of 6 SWD flies in a trap per week, or larvae are noticed in the fruit. Look for fruit flies hovering around fruit and symptoms of premature fruit decay.
Keep berry fields clean of over-ripe and rotten fruit as much as possible. Rotten fruit on the plants or on the ground will greatly increase the number of fruit flies present, by providing them with food and egg-laying sites.
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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