{"id":12528,"date":"2025-08-19T11:38:28","date_gmt":"2025-08-19T15:38:28","guid":{"rendered":"https:\/\/extension.umaine.edu\/highmoor\/?p=12528"},"modified":"2026-04-14T15:22:09","modified_gmt":"2026-04-14T19:22:09","slug":"spotted-wing-drosophila-alert-august-15-2025","status":"publish","type":"post","link":"https:\/\/extension.umaine.edu\/highmoor\/2025\/08\/19\/spotted-wing-drosophila-alert-august-15-2025\/","title":{"rendered":"Spotted Wing Drosophila Alert &#8212; August 15, 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=\"2017\" class=\"wp-caption alignright\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-2017\" src=\"https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2012\/07\/SWD-Male-left-Female-right-GDill-300x219.jpg\" alt=\"Male and Female Spotted Wing Drosophila Flies\" width=\"300\" height=\"219\" srcset=\"https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2012\/07\/SWD-Male-left-Female-right-GDill-300x219.jpg 300w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2012\/07\/SWD-Male-left-Female-right-GDill-768x560.jpg 768w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2012\/07\/SWD-Male-left-Female-right-GDill-1024x747.jpg 1024w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2012\/07\/SWD-Male-left-Female-right-GDill-105x77.jpg 105w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2012\/07\/SWD-Male-left-Female-right-GDill-317x231.jpg 317w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2012\/07\/SWD-Male-left-Female-right-GDill-423x308.jpg 423w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2012\/07\/SWD-Male-left-Female-right-GDill-634x462.jpg 634w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2012\/07\/SWD-Male-left-Female-right-GDill-846x617.jpg 846w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2012\/07\/SWD-Male-left-Female-right-GDill-951x693.jpg 951w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2012\/07\/SWD-Male-left-Female-right-GDill.jpg 1152w\" sizes=\"auto, (max-width: 320px) 85vw, (max-width: 768px) 67vw, (max-width: 1024px) 62vw,300px\" \/><figcaption class=\"wp-caption-text\">Male (left) and Female (right) Spotted Wing Drosophila; photo by Griffin Dill. Actual size: 2-3 mm.<\/figcaption><\/figure>\n<p>Spotted wing drosophila fruit fly numbers remained relatively stable at our trapping sites this week with no big increases or decreases (see table below). Continued hot, dry conditions and no weather patterns moving insects northward into Maine are keeping populations from increasing significantly, as we expect to see at this time of the season. Changes in these conditions could stimulate higher pressure rapidly. At present, a 7-day spray schedule on ripening fruit should be adequate to prevent infestation by larvae.<\/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<p>&nbsp;<\/p>\n<p><strong>Wasps<\/strong> such as yellow-jackets and bald-faced hornets can become serious pests of raspberries, especially during dry seasons, when they feed on ripe fruit and become a hazard to pickers. Wasps are attracted to moisture and sugar, and are very difficult to discourage once they have discovered a good source. To prevent wasps from becoming a problem, harvest frequently and thoroughly. Do not allow over-ripe or injured berries to remain on the plants. Rotting or fermenting fruit is very attractive to wasps. Cover any nearby compost piles or trash receptacles. If you notice wasps starting to visit your field, try to find their nest and destroy it. Wasps build nests underground, in hollow or rotten logs, in trees and in or on houses. Follow all precautions for using wasp-destroying compounds. If the nest cannot be found, several types of wasp traps are available which may offer some relief. The keys to successfully using traps are to determine the appropriate bait for the type of wasp, placing the traps out early, i.e. before the wasps become a problem, and deploying them around the perimeter of the entire field. Applying insecticides to the raspberries is difficult because the wasps are present when the fruit are ripe and pickers are present, so the products used and timing must be carefully considered to ensure the safety of all concerned. When using pesticide products, always read and follow all instructions and precautions.<\/p>\n<p>&nbsp;<\/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\/25\/25<\/th>\n<th>SWD weekly trap catch 8\/1\/25<\/th>\n<th>SWD weekly trap catch 8\/8\/25<\/th>\n<th>SWD weekly trap catch 8\/15\/25<\/th>\n<\/tr>\n<tr>\n<td>Wells<\/td>\n<td style=\"text-align: center\">3<\/td>\n<td style=\"text-align: center\">65<\/td>\n<td style=\"text-align: center\">113<\/td>\n<td style=\"text-align: center\">135<\/td>\n<\/tr>\n<tr>\n<td>Springvale<\/td>\n<td style=\"text-align: center\">6<\/td>\n<td style=\"text-align: center\">17<\/td>\n<td style=\"text-align: center\">22<\/td>\n<td style=\"text-align: center\">67<\/td>\n<\/tr>\n<tr>\n<td>New Gloucester<\/td>\n<td style=\"text-align: center\">37<\/td>\n<td style=\"text-align: center\">94<\/td>\n<td style=\"text-align: center\">478<\/td>\n<td style=\"text-align: center\">190<\/td>\n<\/tr>\n<tr>\n<td>Cape Elizabeth<\/td>\n<td style=\"text-align: center\">16<\/td>\n<td style=\"text-align: center\">67<\/td>\n<td style=\"text-align: center\">107<\/td>\n<td style=\"text-align: center\">474*<\/td>\n<\/tr>\n<tr>\n<td>Bowdoinham<\/td>\n<td style=\"text-align: center\">45<\/td>\n<td style=\"text-align: center\">21<\/td>\n<td style=\"text-align: center\">21<\/td>\n<td style=\"text-align: center\">27<\/td>\n<\/tr>\n<tr>\n<td>Mechanic Falls<\/td>\n<td style=\"text-align: center\">0<\/td>\n<td style=\"text-align: center\">0<\/td>\n<td style=\"text-align: center\">14<\/td>\n<td style=\"text-align: center\">86*<\/td>\n<\/tr>\n<tr>\n<td>Monmouth<\/td>\n<td style=\"text-align: center\">2<\/td>\n<td style=\"text-align: center\">37<\/td>\n<td style=\"text-align: center\">145<\/td>\n<td style=\"text-align: center\">40<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><sup>*plot is no longer being sprayed<\/sup><\/p>\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 remained relatively stable at our trapping sites this week with no big increases or decreases (see table below). Continued hot, dry conditions and [&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-12528","post","type-post","status-publish","format-standard","hentry","category-spotted-wing-drosophila"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Spotted Wing Drosophila Alert - August 15, 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\/19\/spotted-wing-drosophila-alert-august-15-2025\/\" \/>\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 15, 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 remained relatively stable at our trapping sites this week with no big increases or decreases (see table below). 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