{"id":12549,"date":"2025-08-22T13:58:58","date_gmt":"2025-08-22T17:58:58","guid":{"rendered":"https:\/\/extension.umaine.edu\/highmoor\/?p=12549"},"modified":"2026-04-14T15:19:09","modified_gmt":"2026-04-14T19:19:09","slug":"spotted-wing-drosophila-alert-august-22-2025","status":"publish","type":"post","link":"https:\/\/extension.umaine.edu\/highmoor\/2025\/08\/22\/spotted-wing-drosophila-alert-august-22-2025\/","title":{"rendered":"Spotted Wing Drosophila Alert &#8212; August 22, 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=\"5625\" class=\"wp-caption alignright\"><a href=\"https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2017\/10\/SWDElderberry12DHandley.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-5625 size-medium\" src=\"https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2017\/10\/SWDElderberry12DHandley-300x225.jpg\" alt=\"Spotted Wing Drosophila Damage in Elderberry Plant\" width=\"300\" height=\"225\" srcset=\"https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2017\/10\/SWDElderberry12DHandley-300x225.jpg 300w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2017\/10\/SWDElderberry12DHandley-768x576.jpg 768w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2017\/10\/SWDElderberry12DHandley-1024x768.jpg 1024w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2017\/10\/SWDElderberry12DHandley-105x79.jpg 105w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2017\/10\/SWDElderberry12DHandley-317x238.jpg 317w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2017\/10\/SWDElderberry12DHandley-423x317.jpg 423w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2017\/10\/SWDElderberry12DHandley-634x476.jpg 634w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2017\/10\/SWDElderberry12DHandley-846x635.jpg 846w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2017\/10\/SWDElderberry12DHandley-951x713.jpg 951w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2017\/10\/SWDElderberry12DHandley-1268x951.jpg 1268w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2017\/10\/SWDElderberry12DHandley-500x375.jpg 500w\" sizes=\"auto, (max-width: 320px) 85vw, (max-width: 768px) 67vw, (max-width: 1024px) 62vw,300px\" \/><\/a><figcaption class=\"wp-caption-text\">Spotted Wing Drosophila Damage in Elderberry Plant, photo by David Handley<\/figcaption><\/figure>\n<p>Spotted wing drosophila fruit fly numbers are rising at most of our trapping sites this week, although the increases are relatively moderate for this point in the season (see table below). The drought conditions much of the state is experiencing is likely slowing population growth and keeping more flies from coming into the state on storm fronts. Changes in these conditions could stimulate higher pressure rapidly. The increased pressure observed this week may require some fields to shorten intervals between sprays to keep larvae from infesting ripening fruit. A 5 to 7-day spray schedule on ripening fruit may be required to keep fruit in good, marketable condition.<\/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><strong>Drought:<\/strong> It\u2019s official: most of southern and coastal Maine is presently under drought conditions. All plants that are now ripening fruit have high water demands, usually about two inches of water per week, to properly size and ripen fruit without causing lasting stress on the plants.<\/p>\n<figure id=\"484\" class=\"wp-caption alignright\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-484\" src=\"https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2010\/06\/strawberryirrigation062-300x225.jpg\" alt=\"Strawberry Irrigation\" width=\"300\" height=\"225\" srcset=\"https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2010\/06\/strawberryirrigation062-300x225.jpg 300w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2010\/06\/strawberryirrigation062-768x576.jpg 768w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2010\/06\/strawberryirrigation062.jpg 1024w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2010\/06\/strawberryirrigation062-105x79.jpg 105w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2010\/06\/strawberryirrigation062-317x238.jpg 317w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2010\/06\/strawberryirrigation062-423x317.jpg 423w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2010\/06\/strawberryirrigation062-634x476.jpg 634w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2010\/06\/strawberryirrigation062-846x635.jpg 846w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2010\/06\/strawberryirrigation062-951x713.jpg 951w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2010\/06\/strawberryirrigation062-500x375.jpg 500w\" sizes=\"auto, (max-width: 320px) 85vw, (max-width: 768px) 67vw, (max-width: 1024px) 62vw,300px\" \/><figcaption class=\"wp-caption-text\">Strawberry Irrigation, photo by David Handley<\/figcaption><\/figure>\n<p>Irrigation is the best method to prevent and alleviate drought stress, when possible. As harvest season comes to an end for blueberries and raspberries, the plants are already beginning the process of forming flower buds for next year\u2019s crop. Plants experiencing drought stress may produce fewer and\/or weaker buds, resulting in loss of yield and quality the following spring.<\/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 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<th>SWD weekly trap catch 8\/22\/25<\/th>\n<\/tr>\n<tr>\n<td>Wells<\/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<td style=\"text-align: center\">323<\/td>\n<\/tr>\n<tr>\n<td>Springvale<\/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<td style=\"text-align: center\">201<\/td>\n<\/tr>\n<tr>\n<td>New Gloucester<\/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<td style=\"text-align: center\">57<\/td>\n<\/tr>\n<tr>\n<td>Cape Elizabeth<\/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<td style=\"text-align: center\">388*<\/td>\n<\/tr>\n<tr>\n<td>Bowdoinham<\/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<td style=\"text-align: center\">103<\/td>\n<\/tr>\n<tr>\n<td>Mechanic Falls<\/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<td style=\"text-align: center\">115*<\/td>\n<\/tr>\n<tr>\n<td>Monmouth<\/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<td style=\"text-align: center\">24<\/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 are rising at most of our trapping sites this week, although the increases are relatively moderate for this point in the season (see [&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-12549","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 22, 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\/22\/spotted-wing-drosophila-alert-august-22-2025\/\" \/>\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 22, 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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