{"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":"2026-08-24T19:41:56","modified_gmt":"2026-08-24T23:41:56","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 infection risk severity and management timing for potato late blight and early blight.<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.<br \/>\nSee the<\/p>\n<ul>\n<li><strong><a href=\"https:\/\/extension.umaine.edu\/ipm\/insect-lab\/noblight-model-explanation\/\">NoBlight model explainer<\/a><\/strong><\/li>\n<\/ul>\n<p>for these tables.<\/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><\/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.<\/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 infection risk severity and management timing for potato late blight and early blight. 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 at an older version [&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,"footnotes":""},"class_list":["post-28342","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - 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 infection risk severity and management timing for potato late blight and early blight. 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