{"id":12418,"date":"2025-07-11T14:24:29","date_gmt":"2025-07-11T18:24:29","guid":{"rendered":"https:\/\/extension.umaine.edu\/highmoor\/?p=12418"},"modified":"2026-04-14T15:39:52","modified_gmt":"2026-04-14T19:39:52","slug":"spotted-wing-drosophila-alert-july-11-2025","status":"publish","type":"post","link":"https:\/\/extension.umaine.edu\/highmoor\/2025\/07\/11\/spotted-wing-drosophila-alert-july-11-2025\/","title":{"rendered":"Spotted Wing Drosophila Alert — July 11, 2025"},"content":{"rendered":"

David 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<\/strong><\/p>\n

\"Spotted
Spotted Wing Drosophila Larvae in Raspberry; photo by David Handley.<\/figcaption><\/figure>\n

Spotted wing drosophila fruit flies are now being caught in traps we have set up in strawberry and raspberry fields in southern Maine (see table below) and wild blueberry fields in the coastal and midstate regions. Drosophila larvae have been reported in late ripening ripe strawberry fruit in southern and central Maine. This is an early appearance of spotted wing drosophila in damaging numbers. Although we know this insect can successfully survive the winters here in Maine, the small overwintering population usually doesn\u2019t build up to injurious levels until mid to late August. The presence of flies throughout the state indicate that this pest is now actively laying eggs in developing berries. This compliments reports from other New England states indicating that SWD is now active, and that numbers are increasing early this season, likely encouraged by the wet, warm conditions this spring.<\/p>\n

If you are growing raspberries, blackberries and\/or blueberries, spotted wing drosophila will be laying eggs on these fruit as soon as they begin to ripen.<\/p>\n

Spotted wing drosophila populations are likely to build rapidly in the coming weeks as more food (fruit) becomes available for the flies, especially if weather conditions continue to be warm and wet. Now is the time to set out your own traps, if you haven\u2019t 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.<\/p>\n

Important points for managing spotted wing drosophila include:<\/p>\n

    \n
  1. Monitor for the flies with traps, and for the larvae in fruit.<\/li>\n
  2. Spray regularly and often once flies or larvae have been found in the field (every 5 to 7 days).<\/li>\n
  3. Harvest fruit regularly and often; do not leave any ripe\/rotten fruit in the field.<\/li>\n
  4. Sort fruit at harvest; do not leave any soft fruit in the container to be sold.<\/li>\n
  5. Chill all fruit immediately after harvest to 36\u00baF (or as close as you can) for a minimum of 12 hours to slow or stop development of any eggs or larvae.<\/li>\n
  6. Prune the planting, especially the lower region, to open up the canopy and create dry, light conditions.<\/li>\n<\/ol>\n

    Products that provide good control of drosophila on berry crops include spinosad (Radiant\u00ae for strawberries, Delegate\u00ae for raspberries and blueberries), Asana\u00ae, Brigade\u00ae, Danitol\u00ae, Exirel\u00ae and Assail\u00ae. Research suggests that adding table sugar to group 4A insecticides, such as Assail\u00ae, may improve their effectiveness. The recommended rate would be 1-2 lbs. sugar per 100 gallons of spray. Also, it is recommended to add 4-16 oz Nu Film P\u00ae\/100 gal<\/strong> with all materials to improve SWD efficacy and, if it rains after you spray, re-apply a pesticide material. (Read the label for any re-application restrictions of the same material<\/em>.) Please check product labels for rates, post-harvest intervals and safety precautions.<\/p>\n

    \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
    \n

    Characteristics of Insecticides for Spotted Wing Drosophila Control<\/strong><\/h4>\n<\/caption>\n

    Trade Name<\/th>\nDays to Harvest Blueberry<\/th>\nDays of Residual<\/th>\nIRAC Group<\/th>\n<\/tr>\n
    Assail\u00ae<\/td>\n1<\/td>\n5-7<\/td>\n4A<\/td>\n<\/tr>\n
    Mustang Max\u00ae<\/td>\n1<\/td>\n7<\/td>\n3<\/td>\n<\/tr>\n
    *Bifenture\u00ae<\/td>\n1 (3 rasberry)<\/td>\n7<\/td>\n3<\/td>\n<\/tr>\n
    *Brigade\u00ae<\/td>\n1 (3 rasberry)<\/td>\n7<\/td>\n3<\/td>\n<\/tr>\n
    Danitol\u00ae<\/td>\n3<\/td>\n7<\/td>\n3<\/td>\n<\/tr>\n
    Delegate\u00ae<\/td>\n3 (1 raspberry)<\/td>\n7<\/td>\n5<\/td>\n<\/tr>\n
    Entrust\u00ae<\/td>\n3 (1 raspberry)<\/td>\n3-5<\/td>\n5<\/td>\n<\/tr>\n
    Success\u00ae<\/td>\n1 (raspberry only)<\/td>\n3-5<\/td>\n5<\/td>\n<\/tr>\n
    Exirel\u00ae<\/td>\n3 (1 raspberry)<\/td>\n5-7<\/td>\n28<\/td>\n<\/tr>\n
    Imidan\u00ae<\/td>\n3 (not for raspberry)<\/td>\n5-7<\/td>\n1B<\/td>\n<\/tr>\n
    Verdepryn<\/td>\n1<\/td>\n5-7<\/td>\n28<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

    *Contains PFAS Chemicals<\/p>\n

    A Simple Monitoring Trap for Spotted Wing Drosophila<\/h3>\n
    \"Drosophila
    Drosophila Trap, photo by David Handley<\/figcaption><\/figure>\n

    The trap body is made from a 16-ounce red plastic cup (we use Solo Brand P16RLR). You\u2019ll need one that has a tight-fitting lid (we use Solo Brand 626TS). Using a 1\/8\u201d hole punch (available through art suppliers), punch about 15 holes in a row around the cup just under the lip about 1\/2\u201d apart. Leave about 2\u201d of the diameter of the rim with no holes so that liquid can be poured in and out. Punch a second row of holes just under the first row, to give you a total of 30, 1\/8\u201d holes. Use a black permanent marker to paint a 1\/2\u201d wide black strip around the cup under the rim, right over the holes you punched. To support the trap, cut a wooden tomato stake down to about 24\u201d. Attach a 4\u201d or larger hose clamp near the top of the stake to act as a cup holder for the trap. (We punched a hole in the metal band of the hose clamp and attached it to the stake with a flat-headed wood screw.) Place the trap holder in a shady, moist place in or near the fruit planting, with the cup height 12\u201d to 18\u201d off the ground. Fill the trap with 4 to 6 ounces of apple cider vinegar, + tsp. sugar + a pinch of yeast, or whatever bait you prefer. It is best to add a few drops of unscented soap to break the surface tension of the liquid. Place the lid on the cup to keep rain and critters from getting in, and place the trap in the holder. Adjust the hose clamp so that the trap fits in snugly but the trap holes are not covered up. Empty and re-bait the trap every week. Do not pour out the old bait on the ground near the trap, as this will draw flies away from it. Check the traps and change the bait at least weekly.<\/p>\n

    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 $20 plus shipping, it is available from\u00a0Great Lakes IPM Company<\/a>.<\/p>\n

    For more information on identifying spotted wing drosophila (SWD) and updates on populations around the state, visit our\u00a0SWD blog<\/a>.<\/p>\n

    Other IPM Web Pages<\/strong>
    \n    Michigan State University Spotted Wing Drosophila<\/a>
    \n    Penn State University Spotted Wing Drosophila Overview<\/a>
    \n    University of New Hampshire SWD Weekly IPM Reports<\/a><\/p>\n

    David T. Handley
    \nVegetable and Small Fruit Specialist<\/p>\n

    Highmoor Farm<\/strong>
    \nP.O. Box 179
    \nMonmouth, ME 04259
    \n207.933.2100<\/p>\n

    UMaine Extension Diagnostic Research Lab<\/strong>
    \nPest Management Unit
    \n17 Godfrey Drive
    \nOrono, ME 04473
    \n1.800.287.0279<\/p>\n

    \n\n\n\n\n\n\n\n\n\n\n
    \n

    Spotted Wing Drosophila Trap Captures<\/h4>\n<\/caption>\n

    Town<\/th>\nSpotted Wing Drosophila weekly trap catch 6\/27\/25<\/th>\nSpotted Wing Drosophila weekly trap catch 7\/11\/25<\/th>\n<\/tr>\n
    Wells<\/td>\n0<\/td>\n4<\/td>\n<\/tr>\n
    New Gloucester<\/td>\n0<\/td>\n14<\/td>\n<\/tr>\n
    Cape Elizabeth<\/td>\n0<\/td>\n56<\/td>\n<\/tr>\n
    Bowdoinham<\/td>\n0<\/td>\n8<\/td>\n<\/tr>\n
    Mechanic Falls<\/td>\n1<\/td>\n11<\/td>\n<\/tr>\n
    Monmouth<\/td>\n0<\/td>\n1<\/td>\n<\/tr>\n
    Wayne<\/td>\n0<\/td>\n3<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

     <\/p>\n<\/div>\n

    Where brand names or company names are used it is for the reader\u2019s 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.<\/em><\/p>\n

    The University of Maine System is an equal opportunity institution committed to nondiscrimination.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

    David 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 fruit flies are now being caught in traps we have set up in strawberry and raspberry fields in southern Maine (see table below) and wild blueberry […]<\/p>\n","protected":false},"author":201,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[151],"tags":[],"class_list":["post-12418","post","type-post","status-publish","format-standard","hentry","category-spotted-wing-drosophila"],"yoast_head":"\nSpotted Wing Drosophila Alert - July 11, 2025 - Cooperative Extension at Highmoor Farm - University of Maine Cooperative Extension<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/extension.umaine.edu\/highmoor\/2025\/07\/11\/spotted-wing-drosophila-alert-july-11-2025\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Spotted Wing Drosophila Alert - July 11, 2025 - Cooperative Extension at Highmoor Farm - University of Maine Cooperative Extension\" \/>\n<meta property=\"og:description\" content=\"David Handley, Vegetable and Small Fruit Specialist; 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