{"id":12486,"date":"2025-08-01T11:13:32","date_gmt":"2025-08-01T15:13:32","guid":{"rendered":"https:\/\/extension.umaine.edu\/highmoor\/?p=12486"},"modified":"2026-04-14T15:27:28","modified_gmt":"2026-04-14T19:27:28","slug":"spotted-wing-drosophila-alert-august-1-2025","status":"publish","type":"post","link":"https:\/\/extension.umaine.edu\/highmoor\/2025\/08\/01\/spotted-wing-drosophila-alert-august-1-2025\/","title":{"rendered":"Spotted Wing Drosophila Alert &#8212; August 1, 2025"},"content":{"rendered":"<p><strong>David Handley, Vegetable and Small Fruit Specialist; James Dill, Pest Management Specialist; Phil Fanning, Assistant Professor of Agricultural Entomology; Christina Howard, Maine New Farmers Project Manager<\/strong><\/p>\n<figure id=\"4835\" class=\"wp-caption alignright\"><a href=\"https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2015\/10\/SWDtrap2015CHillier4.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-4835 size-medium\" src=\"https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2015\/10\/SWDtrap2015CHillier4-300x225.jpg\" alt=\"Spotted Wing Drosophila Trap Catch\" width=\"300\" height=\"225\" srcset=\"https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2015\/10\/SWDtrap2015CHillier4-300x225.jpg 300w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2015\/10\/SWDtrap2015CHillier4-768x576.jpg 768w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2015\/10\/SWDtrap2015CHillier4-1024x768.jpg 1024w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2015\/10\/SWDtrap2015CHillier4-105x79.jpg 105w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2015\/10\/SWDtrap2015CHillier4-317x238.jpg 317w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2015\/10\/SWDtrap2015CHillier4-423x317.jpg 423w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2015\/10\/SWDtrap2015CHillier4-634x476.jpg 634w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2015\/10\/SWDtrap2015CHillier4-846x635.jpg 846w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2015\/10\/SWDtrap2015CHillier4-951x713.jpg 951w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2015\/10\/SWDtrap2015CHillier4-1268x951.jpg 1268w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2015\/10\/SWDtrap2015CHillier4-500x375.jpg 500w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2015\/10\/SWDtrap2015CHillier4.jpg 1280w\" sizes=\"auto, (max-width: 320px) 85vw, (max-width: 768px) 67vw, (max-width: 1024px) 62vw,300px\" \/><\/a><figcaption class=\"wp-caption-text\">Spotted Wing Drosophila Trap Catch, photo by Christina Howard<\/figcaption><\/figure>\n<p>Spotted wing drosophila fruit fly numbers have increased at most our trapping sites in Southern Maine this week (see table below). Populations are over the recommended spray threshold (4\/ trap\/week) at nearly all sites. The continued hot, dry conditions are likely keeping populations from increasing at a faster pace, as we would normally expect when plenty of ripe fruit is available. At present, a 7-day spray schedule on ripening fruit should be adequate to prevent infestation by larvae. Higher populations of flies may require a shorter spray interval as the season progresses.<\/p>\n<p>If you are growing raspberries, blackberries and\/or blueberries, you should be managing spotted wing drosophila on any fruit that is presently ripening and\/or being harvested to prevent infestation.<\/p>\n<p>For more information on identifying spotted wing drosophila (SWD) and updates on populations around the state, visit our <a href=\"https:\/\/extension.umaine.edu\/highmoor\/category\/spotted-wing-drosophila\/\">SWD blog<\/a>.<\/p>\n<figure id=\"1629\" class=\"wp-caption alignright\"><a href=\"https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2012\/05\/WhiteGrubStrawberry12a.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1629 size-medium\" src=\"https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2012\/05\/WhiteGrubStrawberry12a-300x225.jpg\" alt=\"White Grub Under Strawberry\" width=\"300\" height=\"225\" srcset=\"https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2012\/05\/WhiteGrubStrawberry12a-300x225.jpg 300w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2012\/05\/WhiteGrubStrawberry12a-768x576.jpg 768w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2012\/05\/WhiteGrubStrawberry12a-1024x768.jpg 1024w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2012\/05\/WhiteGrubStrawberry12a-105x79.jpg 105w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2012\/05\/WhiteGrubStrawberry12a-317x238.jpg 317w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2012\/05\/WhiteGrubStrawberry12a-423x317.jpg 423w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2012\/05\/WhiteGrubStrawberry12a-634x476.jpg 634w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2012\/05\/WhiteGrubStrawberry12a-846x635.jpg 846w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2012\/05\/WhiteGrubStrawberry12a-951x713.jpg 951w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2012\/05\/WhiteGrubStrawberry12a-1268x951.jpg 1268w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2012\/05\/WhiteGrubStrawberry12a-500x375.jpg 500w\" sizes=\"auto, (max-width: 320px) 85vw, (max-width: 768px) 67vw, (max-width: 1024px) 62vw,300px\" \/><\/a><figcaption class=\"wp-caption-text\">White Grub Under Strawberry Plant, photo by David Handley<\/figcaption><\/figure>\n<p><strong>White grubs<\/strong> are the larvae of several species of scarab beetles, including June beetles, rose chafers, Japanese beetles, Asiatic garden beetles and European chafers. Several of these species have been very prevalent this year, so we may expect grub problems to be more common next spring and summer. The beetles lay their eggs in June and July and the grubs feed on the roots of strawberries, raspberries and blueberries from July through mid-September. Affected plants will be stunted and wilted and may die during dry periods. Pulling up plants reveals that roots have been chewed off about an inch below the soil line. Sifting through the soil below the plants may reveal the whitish crescent-shaped grubs which can range in size from 3\/8 inch to almost 1 \u00bd inches long, with six legs near the head and a swollen rear-end. The two most effective periods to treat plantings for grubs are in the spring prior to when they pupate (May) and in the late summer when the next generation is actively feeding (late August). Materials should be applied with plenty of water to moist soil to be sure they reach the root zone. Materials currently registered for control of grubs include Platinum\u00ae and Admire Pro\u00ae. Parasitic nematodes can also provide control of grubs and should be applied with similar timing. Nematodes are very sensitive to ultraviolet light and dehydration and must be applied with lots of water. See the New England Small Fruit Management Guide for sources of parasitic nematodes.<\/p>\n<p><strong>Other IPM Web Pages<\/strong><br \/>\n<a href=\"http:\/\/www.canr.msu.edu\/ipm\/invasive_species\/spotted_wing_drosophila\/\" target=\"_blank\" rel=\"noopener\">Michigan State University Spotted Wing Drosophila<\/a><br \/>\n<a href=\"https:\/\/extension.psu.edu\/spotted-wing-drosophila-part-1-overview-and-identification\" target=\"_blank\" rel=\"noopener\">Penn State University Spotted Wing Drosophila Overview<\/a><br \/>\n<a href=\"https:\/\/extension.unh.edu\/resource\/spotted-wing-drosophila-ipm-weekly-scouting-reports\" target=\"_blank\" rel=\"noopener\">University of New Hampshire SWD Weekly IPM Reports<\/a><\/p>\n<p>David T. Handley<br \/>\nVegetable and Small Fruit Specialist<\/p>\n<p><strong>Highmoor Farm<\/strong><br \/>\nP.O. Box 179<br \/>\nMonmouth, ME 04259<br \/>\n207.933.2100<\/p>\n<p><strong>UMaine Extension Diagnostic Research Lab<\/strong><br \/>\nPest Management Unit<br \/>\n17 Godfrey Drive<br \/>\nOrono, ME 04473<br \/>\n1.800.287.0279<\/p>\n<div>\n<table style=\"width: 100%\" border=\"1\">\n<caption>\n<h4>Spotted Wing Drosophila (SWD) Trap Captures<\/h4>\n<\/caption>\n<tbody>\n<tr>\n<th>Town<\/th>\n<th>SWD weekly trap catch 7\/11\/25<\/th>\n<th>SWD weekly trap catch 7\/18\/25<\/th>\n<th>SWD weekly trap catch 7\/25\/25<\/th>\n<th>SWD weekly trap catch 8\/1\/25<\/th>\n<\/tr>\n<tr>\n<td>Wells<\/td>\n<td style=\"text-align: center\">4<\/td>\n<td style=\"text-align: center\">9<\/td>\n<td style=\"text-align: center\">3<\/td>\n<td style=\"text-align: center\">65<\/td>\n<\/tr>\n<tr>\n<td>Springvale<\/td>\n<td style=\"text-align: center\"><\/td>\n<td style=\"text-align: center\">46<\/td>\n<td style=\"text-align: center\">6<\/td>\n<td style=\"text-align: center\">17<\/td>\n<\/tr>\n<tr>\n<td>New Gloucester<\/td>\n<td style=\"text-align: center\">14<\/td>\n<td style=\"text-align: center\">42<\/td>\n<td style=\"text-align: center\">37<\/td>\n<td style=\"text-align: center\">94<\/td>\n<\/tr>\n<tr>\n<td>Cape Elizabeth<\/td>\n<td style=\"text-align: center\">56<\/td>\n<td style=\"text-align: center\">101<\/td>\n<td style=\"text-align: center\">16<\/td>\n<td style=\"text-align: center\">67<\/td>\n<\/tr>\n<tr>\n<td>Bowdoinham<\/td>\n<td style=\"text-align: center\">8<\/td>\n<td style=\"text-align: center\">43<\/td>\n<td style=\"text-align: center\">45<\/td>\n<td style=\"text-align: center\">21<\/td>\n<\/tr>\n<tr>\n<td>Mechanic Falls<\/td>\n<td style=\"text-align: center\">11<\/td>\n<td style=\"text-align: center\">1<\/td>\n<td style=\"text-align: center\">0<\/td>\n<td style=\"text-align: center\">0<\/td>\n<\/tr>\n<tr>\n<td>Monmouth<\/td>\n<td style=\"text-align: center\">1<\/td>\n<td style=\"text-align: center\">3<\/td>\n<td style=\"text-align: center\">2<\/td>\n<td style=\"text-align: center\">37<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><em>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<\/div>\n<p><em>The University of Maine System is an equal opportunity institution committed to nondiscrimination.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>David Handley, Vegetable and Small Fruit Specialist; James Dill, Pest Management Specialist; Phil Fanning, Assistant Professor of Agricultural Entomology; Christina Howard, Maine New Farmers Project Manager Spotted wing drosophila fruit fly numbers have increased at most our trapping sites in Southern Maine this week (see table below). Populations are over the recommended spray threshold (4\/ [&hellip;]<\/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-12486","post","type-post","status-publish","format-standard","hentry","category-spotted-wing-drosophila"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Spotted Wing Drosophila Alert - August 1, 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\/08\/01\/spotted-wing-drosophila-alert-august-1-2025\/\" \/>\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 - August 1, 2025 - Cooperative Extension at Highmoor Farm - University of Maine Cooperative Extension\" \/>\n<meta property=\"og:description\" content=\"David Handley, Vegetable and Small Fruit Specialist; James Dill, Pest Management Specialist; Phil Fanning, Assistant Professor of Agricultural Entomology; Christina Howard, Maine New Farmers Project Manager Spotted wing drosophila fruit fly numbers have increased at most our trapping sites in Southern Maine this week (see table below). 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