{"id":28342,"date":"2023-07-02T05:39:31","date_gmt":"2023-07-02T09:39:31","guid":{"rendered":"https:\/\/extension.umaine.edu\/ipm\/?page_id=28342"},"modified":"2025-07-25T18:07:18","modified_gmt":"2025-07-25T22:07:18","slug":"potato-late-blight-fungicide-intervals","status":"publish","type":"page","link":"https:\/\/extension.umaine.edu\/ipm\/potato-late-blight-fungicide-intervals\/","title":{"rendered":"Potato Late Blight and Early Blight Fungicide Intervals"},"content":{"rendered":"<p>The page links listed below use site-specific hourly weather observations and forecasts to estimate severity and management timing for potato late blight and early blight. Updates will resume in June 2024.<br \/>\nMake sure you have the latest update by hitting &#8220;Refresh&#8221; after clicking on the table link for a site.\u00a0 Otherwise, you may be looking at an older version stored in your browser cache.<\/p>\n<ul>\n<li><strong><a href=\"https:\/\/extension.umaine.edu\/ipm\/ashland-me-potato-late-blight-fungicide-intervals\/\">Ashland<\/a><\/strong><\/li>\n<li><strong><a href=\"https:\/\/extension.umaine.edu\/ipm\/Bridgewater-me-potato-late-blight-fungicide-intervals\/\">Bridgewater<\/a><\/strong><\/li>\n<li><strong><a href=\"https:\/\/extension.umaine.edu\/ipm\/caribou-me-potato-late-blight-fungicide-intervals\/\">Caribou<\/a><\/strong><\/li>\n<li><strong><a href=\"https:\/\/extension.umaine.edu\/ipm\/corinth-me-potato-late-blight-fungicide-intervals\/\">Corinth<\/a><\/strong><\/li>\n<li><strong><a href=\"https:\/\/extension.umaine.edu\/ipm\/DoverFoxcroft-me-potato-late-blight-fungicide-intervals\/\">Dover Foxcroft<\/a><\/strong><\/li>\n<li><strong><a href=\"https:\/\/extension.umaine.edu\/ipm\/Easton-me-potato-late-blight-fungicide-intervals\/\">Easton<\/a><\/strong><\/li>\n<li><strong><a href=\"https:\/\/extension.umaine.edu\/ipm\/FortFairfield-me-potato-late-blight-fungicide-intervals\/\">Fort Fairfield<\/a><\/strong><\/li>\n<li><strong><a href=\"https:\/\/extension.umaine.edu\/ipm\/FortKent-me-potato-late-blight-fungicide-intervals\/\">Fort Kent<\/a><\/strong><\/li>\n<li><strong><a href=\"https:\/\/extension.umaine.edu\/ipm\/Houlton-me-potato-late-blight-fungicide-intervals\/\">Houlton<\/a><\/strong><\/li>\n<li><strong><a href=\"https:\/\/extension.umaine.edu\/ipm\/Monmouth-me-potato-late-blight-fungicide-intervals\/\">Monmouth<\/a><\/strong><\/li>\n<li><strong><a href=\"https:\/\/extension.umaine.edu\/ipm\/newport-me-potato-late-blight-fungicide-intervals\/\">Newport<\/a><\/strong><\/li>\n<li><strong><a href=\"https:\/\/extension.umaine.edu\/ipm\/oldtown-me-potato-late-blight-fungicide-intervals\/\">Old Town<\/a><\/strong><\/li>\n<li><strong><a href=\"https:\/\/extension.umaine.edu\/ipm\/patten-me-potato-late-blight-fungicide-intervals\/\">Patten<\/a><\/strong><\/strong><\/li>\n<li><strong><a href=\"https:\/\/extension.umaine.edu\/ipm\/potato-late-blight-fungicide-intervals\/presque-isle-me-lateblightfungicide\/\">Presque Isle<\/a><\/strong><\/li>\n<li><strong><a href=\"https:\/\/extension.umaine.edu\/ipm\/potato-late-blight-fungicide-intervals\/sanford-me-potato-late-blight-fungicide-intervals\/\">Sanford<\/a><\/strong><\/li>\n<li><strong><a href=\"https:\/\/extension.umaine.edu\/ipm\/StAgatha-me-potato-late-blight-fungicide-intervals\/\">St. Agatha<\/a><\/strong><\/li>\n<li><strong><a href=\"https:\/\/extension.umaine.edu\/ipm\/VanBuren-me-potato-late-blight-fungicide-intervals\/\">Van Buren<\/a><\/strong><\/li>\n<\/ul>\n<p><strong>Model calculations, design, &amp; web posting by AgRadar, <\/strong>G.W. Koehler, UMaine Extension.<\/p>\n<p><strong>Weather data<\/strong> <strong>from AgEye Weather<\/strong>, S.D. Birkel, Maine Climate Office &amp; UMaine Extension, Potato weather site assistance by G.W. Koehler.<\/p>\n<p><strong>Late blight spray intervals<\/strong> based on <a href=\"https:\/\/extension.umaine.edu\/publications\/2418e\/\" target=\"_blank\" rel=\"noopener\">&#8220;Potato Facts: Late Blight Prediction in Maine&#8221;<\/a>, S.B. Johnson, 2005.\u00a0 University of Maine Cooperative Extension Bulletin #2418.<\/p>\n<p><strong>Early blight P-values<\/strong> based on <a href=\"https:\/\/www.apsnet.org\/publications\/plantdisease\/backissues\/Documents\/1986Articles\/PlantDisease70n10_915.PDF\" target=\"_blank\" rel=\"noopener\">&#8220;Comparison of forecasting methods for control of potato early blight in Wisconsin&#8221; (PDF)<\/a>.\u00a0 J.W. Pscheidt, and W.R. Stevenson, 1986. \u00a0Plant Disease 70:915-920.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The page links listed below use site-specific hourly weather observations and forecasts to estimate severity and management timing for potato late blight and early blight. Updates will resume in June 2024. Make sure you have the latest update by hitting &#8220;Refresh&#8221; after clicking on the table link for a site.\u00a0 Otherwise, you may be looking [&hellip;]<\/p>\n","protected":false},"author":133,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"templates\/page-withsidebar.php","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":""},"class_list":["post-28342","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Potato Late Blight and Early Blight Fungicide Intervals - Cooperative Extension: Insect Pests, Ticks and Plant Diseases - 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\/ipm\/potato-late-blight-fungicide-intervals\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Potato Late Blight and Early Blight Fungicide Intervals - Cooperative Extension: Insect Pests, Ticks and Plant Diseases - University of Maine Cooperative Extension\" \/>\n<meta property=\"og:description\" content=\"The page links listed below use site-specific hourly weather observations and forecasts to estimate severity and management timing for potato late blight and early blight. 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