{"id":12427,"date":"2025-07-18T13:35:59","date_gmt":"2025-07-18T17:35:59","guid":{"rendered":"https:\/\/extension.umaine.edu\/highmoor\/?p=12427"},"modified":"2026-04-14T15:32:54","modified_gmt":"2026-04-14T19:32:54","slug":"spotted-wing-drosophila-alert-july-18-2025","status":"publish","type":"post","link":"https:\/\/extension.umaine.edu\/highmoor\/2025\/07\/18\/spotted-wing-drosophila-alert-july-18-2025\/","title":{"rendered":"Spotted Wing Drosophila Alert &#8212; July 18, 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<p>We are now catching spotted wing drosophila fruit flies at all of our trapping sites 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 strawberries, raspberries and blueberries in southern and central Maine, indicating that the flies are now actively laying eggs in ripening fruit.<\/p>\n<figure id=\"12448\" class=\"wp-caption alignnone\"><a href=\"https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2025\/07\/IMG_1198-e1752855773808.jpeg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-12448\" src=\"https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2025\/07\/IMG_1198-e1752855773808-300x274.jpeg\" alt=\"Spotted Wing Drosophila male and female and parasitic wasp\" width=\"300\" height=\"274\" srcset=\"https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2025\/07\/IMG_1198-e1752855773808-300x274.jpeg 300w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2025\/07\/IMG_1198-e1752855773808-1024x935.jpeg 1024w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2025\/07\/IMG_1198-e1752855773808-768x701.jpeg 768w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2025\/07\/IMG_1198-e1752855773808-105x96.jpeg 105w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2025\/07\/IMG_1198-e1752855773808-317x289.jpeg 317w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2025\/07\/IMG_1198-e1752855773808-423x386.jpeg 423w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2025\/07\/IMG_1198-e1752855773808-634x579.jpeg 634w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2025\/07\/IMG_1198-e1752855773808-846x772.jpeg 846w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2025\/07\/IMG_1198-e1752855773808-951x868.jpeg 951w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2025\/07\/IMG_1198-e1752855773808-1268x1157.jpeg 1268w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2025\/07\/IMG_1198-e1752855773808.jpeg 1536w\" sizes=\"auto, (max-width: 320px) 85vw, (max-width: 768px) 67vw, (max-width: 1024px) 62vw,300px\" \/><\/a><figcaption class=\"wp-caption-text\">Spotted Wing Drosophila Male and Female and Parasitic Wasp caught in Maine by Christina Howard<\/figcaption><\/figure>\n<p>If you are growing raspberries, blackberries and\/or blueberries, You should be starting management practices now for spotted wing drosophila on any fruit that is ripening to prevent infestation.<\/p>\n<p>Spotted wing drosophila populations are likely to build rapidly in the coming weeks as more food (fruit) becomes available for the flies.\u00a0 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<figure id=\"3047\" class=\"wp-caption alignnone\"><a href=\"https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2013\/07\/SWDMaggotRaspberry12b-DHandley.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-3047\" src=\"https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2013\/07\/SWDMaggotRaspberry12b-DHandley-300x225.jpg\" alt=\"Spotted Wing Drosophila Maggot in Raspberry\" width=\"300\" height=\"225\" srcset=\"https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2013\/07\/SWDMaggotRaspberry12b-DHandley-300x225.jpg 300w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2013\/07\/SWDMaggotRaspberry12b-DHandley-768x576.jpg 768w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2013\/07\/SWDMaggotRaspberry12b-DHandley-1024x768.jpg 1024w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2013\/07\/SWDMaggotRaspberry12b-DHandley-105x79.jpg 105w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2013\/07\/SWDMaggotRaspberry12b-DHandley-317x238.jpg 317w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2013\/07\/SWDMaggotRaspberry12b-DHandley-423x317.jpg 423w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2013\/07\/SWDMaggotRaspberry12b-DHandley-634x476.jpg 634w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2013\/07\/SWDMaggotRaspberry12b-DHandley-846x635.jpg 846w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2013\/07\/SWDMaggotRaspberry12b-DHandley-951x713.jpg 951w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2013\/07\/SWDMaggotRaspberry12b-DHandley-1268x951.jpg 1268w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2013\/07\/SWDMaggotRaspberry12b-DHandley-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 Maggot in Raspberry; photo by David Handley<\/figcaption><\/figure>\n<p>We have found some maggots in blueberry fruit this week, but these are the larvae of Blueberry Fruit Fly (aka Blueberry Maggot), not spotted wing drosophila. Blueberry maggot populations of this insect have been very high this season, and any plantings that were not sprayed as fruit began to ripen are susceptible to infestation.\u00a0 For a good fact sheet on this pest visit our web site: http:\/\/umaine.edu\/blueberries\/factsheets\/insects\/201-monitoring-for-the-blueberry-maggot\/<\/p>\n<figure id=\"12450\" class=\"wp-caption alignnone\"><a href=\"https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2025\/07\/BluebMaggotInFruit1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-12450\" src=\"https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2025\/07\/BluebMaggotInFruit1-300x295.jpg\" alt=\"Blueberry Maggot larve on blueberry fruit\" width=\"300\" height=\"295\" srcset=\"https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2025\/07\/BluebMaggotInFruit1-300x295.jpg 300w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2025\/07\/BluebMaggotInFruit1-1024x1005.jpg 1024w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2025\/07\/BluebMaggotInFruit1-768x754.jpg 768w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2025\/07\/BluebMaggotInFruit1-1536x1508.jpg 1536w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2025\/07\/BluebMaggotInFruit1-2048x2011.jpg 2048w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2025\/07\/BluebMaggotInFruit1-105x103.jpg 105w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2025\/07\/BluebMaggotInFruit1-317x311.jpg 317w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2025\/07\/BluebMaggotInFruit1-423x415.jpg 423w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2025\/07\/BluebMaggotInFruit1-634x622.jpg 634w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2025\/07\/BluebMaggotInFruit1-846x831.jpg 846w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2025\/07\/BluebMaggotInFruit1-951x934.jpg 951w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2025\/07\/BluebMaggotInFruit1-1268x1245.jpg 1268w, https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2025\/07\/BluebMaggotInFruit1-32x32.jpg 32w\" sizes=\"auto, (max-width: 320px) 85vw, (max-width: 768px) 67vw, (max-width: 1024px) 62vw,300px\" \/><\/a><figcaption class=\"wp-caption-text\">Blueberry Maggot In Fruit by Dr. James Dill<\/figcaption><\/figure>\n<p>The larvae of these two pests can be distinguished from one and other based on shape and size.\u00a0\u00a0\u00a0 Blueberry maggot larvae are &#8220;carrot-shaped&#8221;. Their head end, with dark mouth parts often visible, is tapered to a point and their rear end, with six, light brown spiracles (breathing holes; in two rows of three) is flattened. Larvae of spotted wing drosophila are tapered on both ends, with their breathing tubes coming to a point at their rear end. Blueberry maggot larvae are also usually larger than drosophila larvae, but this is not always the case, depending on the stage of development of each.<\/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 6\/27\/25<\/th>\n<th>SWD weekly trap catch 7\/11\/25<\/th>\n<th>SWD weekly trap catch 7\/18\/25<\/th>\n<\/tr>\n<tr>\n<td>Wells<\/td>\n<td style=\"text-align: center\">0<\/td>\n<td style=\"text-align: center\">4<\/td>\n<td style=\"text-align: center\">9<\/td>\n<\/tr>\n<tr>\n<td>Springvale<\/td>\n<td style=\"text-align: center\"><\/td>\n<td style=\"text-align: center\"><\/td>\n<td style=\"text-align: center\">46<\/td>\n<\/tr>\n<tr>\n<td>New Gloucester<\/td>\n<td style=\"text-align: center\">0<\/td>\n<td style=\"text-align: center\">14<\/td>\n<td style=\"text-align: center\">42<\/td>\n<\/tr>\n<tr>\n<td>Cape Elizabeth<\/td>\n<td style=\"text-align: center\">0<\/td>\n<td style=\"text-align: center\">56<\/td>\n<td style=\"text-align: center\">101<\/td>\n<\/tr>\n<tr>\n<td>Bowdoinham<\/td>\n<td style=\"text-align: center\">0<\/td>\n<td style=\"text-align: center\">8<\/td>\n<td style=\"text-align: center\">43<\/td>\n<\/tr>\n<tr>\n<td>Mechanic Falls<\/td>\n<td style=\"text-align: center\">1<\/td>\n<td style=\"text-align: center\">11<\/td>\n<td style=\"text-align: center\">1<\/td>\n<\/tr>\n<tr>\n<td>Monmouth<\/td>\n<td style=\"text-align: center\">0<\/td>\n<td style=\"text-align: center\">1<\/td>\n<td style=\"text-align: center\">3<\/td>\n<\/tr>\n<tr>\n<td>Wayne<\/td>\n<td style=\"text-align: center\">0<\/td>\n<td style=\"text-align: center\">3<\/td>\n<td style=\"text-align: center\">1<\/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 We are now catching spotted wing drosophila fruit flies at all of our trapping sites in Southern Maine (see table below) and wild blueberry fields in the coastal 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-12427","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 - July 18, 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\/18\/spotted-wing-drosophila-alert-july-18-2025\/\" \/>\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 18, 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 We are now catching spotted wing drosophila fruit flies at all of our trapping sites in Southern Maine (see table below) and wild blueberry fields in the coastal and [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/extension.umaine.edu\/highmoor\/2025\/07\/18\/spotted-wing-drosophila-alert-july-18-2025\/\" \/>\n<meta property=\"og:site_name\" content=\"Cooperative Extension at Highmoor Farm\" \/>\n<meta property=\"article:published_time\" content=\"2025-07-18T17:35:59+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-04-14T19:32:54+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/extension.umaine.edu\/highmoor\/wp-content\/uploads\/sites\/48\/2025\/07\/IMG_1198-e1752855773808.jpeg\" \/>\n\t<meta property=\"og:image:width\" content=\"1536\" \/>\n\t<meta property=\"og:image:height\" content=\"1402\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"swright\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"swright\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/extension.umaine.edu\/highmoor\/2025\/07\/18\/spotted-wing-drosophila-alert-july-18-2025\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/extension.umaine.edu\/highmoor\/2025\/07\/18\/spotted-wing-drosophila-alert-july-18-2025\/\"},\"author\":{\"name\":\"swright\",\"@id\":\"https:\/\/extension.umaine.edu\/highmoor\/#\/schema\/person\/820653c187b608883de680eb1114cf9c\"},\"headline\":\"Spotted Wing Drosophila Alert &#8212; 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