Spotted Wing Drosophila Alert and Berry Notes — September 21, 2023

Raspberries, variety PolanaDavid Handley, Vegetable and Small Fruit Specialist; James Dill, Pest Management Specialist, Phil Fanning, Assistant Professor of Agricultural Entomology, Christina Howard, Maine New Farmer Project Manager

Spotted wing drosophila trap counts were higher in nearly all locations this week, most notably in a field where spraying had been stopped. Although these numbers are relatively low for this point in the season, they do represent a significant threat to the remaining fall berry crop if left unmanaged. With no very cold weather predicted for the near term, it is likely that populations will continue to rise as long as food is available. Frequent, regular harvests to prevent the accumulation of overripe fruit in the field can reduce the buildup of drosophila populations.

A 5-7 day spray schedule is recommended to minimize fruit infestation in fields.

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

celery photo for landing page image link for resources by cropHighmoor Farm 2023 Fall Open House October 5, 2023 at 5:00 p.m.
University of Maine Cooperative Extension at Highmoor Farm will be hosting its annual fall tour on Thursday, October 5 at 5:00 p.m. Join us to learn about this year’s research and to share your season’s highlights and challenges.  Trials on tour this year will include artichokes, blueberries, celery, celeriac, strawberries and more than 20 varieties of pumpkins. All are welcome and there is no cost to attend. Highmoor Farm is located at 52 US Route 202 in Monmouth, ME. If you have any questions or require any accommodation to attend, please contact us at 207.933.2100.

Other IPM Web Pages
Michigan State University Spotted Wing Drosophila
Penn State University Spotted Wing Drosophila Overview
University of New Hampshire SWD Weekly IPM Reports

David T. Handley
Vegetable and Small Fruit Specialist

Highmoor Farm
P.O. Box 179
Monmouth, ME 04259

UMaine Extension Diagnostic Research Lab
Pest Management Unit
17 Godfrey Drive
Orono, ME 04473

Where brand names or company names are used it is for the reader’s information. No endorsement is implied nor is any discrimination intended against other products with similar ingredients. Always consult product labels for rates, application instructions and safety precautions. Users of these products assume all associated risks.

The University of Maine is an equal opportunity/affirmative action institution.

Weekly Spotted Wing Drosophila Trap Captures

Town Spotted Wing Drosophila weekly trap catch 8/4/23 Spotted Wing Drosophila weekly trap catch 8/11/23 Spotted Wing Drosophila trap catch average for 8/14/23 – 8/25/2023 Spotted Wing Drosophila weekly trap catch 9/1/23 Spotted Wing Drosophila weekly trap catch 9/8/23 Spotted Wing Drosophila weekly trap catch 9/15/23 Spotted Wing Drosophila weekly trap catch 9/21/23
Wells 22 166 600 276 740 125 245
Limington 2 19 104 65 175 64 442
New Gloucester 214 280 840 400 316 178 376
Mechanic Falls 20 34 976 1,029 500 65 224
Bowdoinham 42 138 624 158 270 296 291
Monmouth (unsprayed plot) 43 114 1,408 168 119 46 369
Wayne 8 1,012 1,012 696 98 2,040