This announcement is also posted with color pictures on the Highmoor Farm Spotted Wing Drosophila web blog at https://extension.umaine.edu/highmoor/spotted-wing-drosophila/, where you can subscribe to updates.
Spotted Wing Drosophila Alert: 7/21/2017
David Handley, Vegetable and Small Fruit Specialist; James Dill, Pest Management Specialist; Frank Drummond, Professor of Insect Ecology/Entomology
There has been an increase in spotted wing drosophila activity at most trapping sites this week (see table below). Reports from throughout the northeast suggest a similar trend. This is significantly earlier activity than we have seen in recent years, and some of the trap counts are already well above what we consider potentially damaging to ripening berry crops, especially raspberries and blueberries. Research suggests that when 6 to 10 flies are caught in a yeast-baited trap in a week, larvae will start appearing in the fruit.
We expect that spotted wing drosophila populations (SWD) will continue to build rapidly in the coming weeks as more eggs are laid in the fruit that is now ripening. Growers should set out traps, if you haven’t already. Start protective sprays on any berries that have begun to ripen when more than four spotted wing drosophila flies are caught in a trap, or any larvae are noticed in the fruit. Look for fruit flies hovering around fruit and symptoms of premature fruit decay. Remember, the flies favor shady, moist regions of the planting.
You can find directions for making a home-made SWD monitoring trap on our blog. (See address below.) An effective commercial trap and bait is now available from Scentry. The trap is reusable and the bait lasts 4-6weeks. Cost for both is about $15 plus shipping, it is available from Great Lakes IPM Company (http://www.greatlakesipm.com/).
For more information on identifying spotted wing drosophila and updates on populations around the state, visit our SWD blog at: http://umaine.edu/highmoor/blog/tag/spotted-wing-drosophila/.
Other IPM Web Pages
Michigan State University: http://www.ipm.msu.edu/invasive_species/spotted_wing_drosophila
Penn State University: http://extension.psu.edu/pests/ipm/agriculture/fruits/spotted-wing-drosophila
University of New Hampshire: http://extension.unh.edu/New-and-Invasive-Pests/Spotted-Wing-Drosophila-SWD
David T. Handley
Vegetable and Small Fruit Specialist
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Administrative Specialist II
University of Maine Cooperative Extension
Maine Crop Insurance Education Program
P.O. Box 179/52 US Route 202
Monmouth, ME 04259
Tel. 207.933.2100 X100