Spotted Wing Drosophila Alert: October 20, 2017
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.
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, P.O. Box 179, 52 US Route 202, Monmouth, ME 04259, 207.933.2100
UMaine Extension Diagnostic Research Lab, Pest Management Unit, 17 Godfrey Drive, Orono, ME 04473, 1.800.287.0279
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