{"id":514,"date":"2010-02-04T16:55:16","date_gmt":"2010-02-04T21:55:16","guid":{"rendered":"https:\/\/extension.umaine.edu\/cranberries\/?page_id=514"},"modified":"2023-01-10T15:01:25","modified_gmt":"2023-01-10T15:01:25","slug":"degree-days","status":"publish","type":"page","link":"https:\/\/extension.umaine.edu\/cranberries\/grower-services\/degree-days\/","title":{"rendered":"Growing Degree Days (GDD)"},"content":{"rendered":"<p><strong>Target Numbers<\/strong> (based on Maine averages from 2007 &#8211; 2016, with the &#8216;start date&#8217; being the point at which the bed is first free of water, ice or snow; base temperature of 50\u00b0F used for the following Growing Degree Day targets)<strong>:<\/strong><\/p>\n<ul>\n<li><strong>Cranberry Tipworm eggs<\/strong> first appearing: <strong>~247 GDD <\/strong>(but crop stage is a more dependable predictor; eggs generally appear as soon as tiny new shoots begin to grow up from the runners, and the eggs are deposited almost exclusively on the tips of these tender, new shoots). Tipworm populations have declined significantly in recent years; populations have been so low, in fact, that the first generation of the season has been difficult to detect. <strong>Some Sweepnet &#8216;First Dates&#8217;<\/strong> <strong>(for catching tipworm flies):<\/strong> 5\/14\/07 in Mt. Vernon; 5\/28\/07, 5\/16\/08, and 5\/13\/09 in Troy; 5\/16\/08 in Lincolnville.<\/li>\n<li><strong>Blackheaded Fireworm<\/strong> <strong>larvae<\/strong> &#8211; The majority of first-generation larvae hatching from their eggs which have overwintered: <strong>~194 GDD<\/strong><\/li>\n<\/ul>\n<hr \/>\n<p>Growing Degree Days (GDD) are a measure of the \u201cheat units\u201d (related to the external temperature and the amount of time per day that an insect spends actively growing) that accumulate over time during a given year.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Target Numbers (based on Maine averages from 2007 &#8211; 2016, with the &#8216;start date&#8217; being the point at which the bed is first free of water, ice or snow; base temperature of 50\u00b0F used for the following Growing Degree Day targets): Cranberry Tipworm eggs first appearing: ~247 GDD (but crop stage is a more dependable [&hellip;]<\/p>\n","protected":false},"author":60,"featured_media":0,"parent":372,"menu_order":6,"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-514","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>Growing Degree Days (GDD) - Cooperative Extension: Cranberries - 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\/cranberries\/grower-services\/degree-days\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Growing Degree Days (GDD) - Cooperative Extension: Cranberries - University of Maine Cooperative Extension\" \/>\n<meta property=\"og:description\" content=\"Target Numbers (based on Maine averages from 2007 &#8211; 2016, with the &#8216;start date&#8217; being the point at which the bed is first free of water, ice or snow; base temperature of 50\u00b0F used for the following Growing Degree Day targets): Cranberry Tipworm eggs first appearing: ~247 GDD (but crop stage is a more dependable [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/extension.umaine.edu\/cranberries\/grower-services\/degree-days\/\" \/>\n<meta property=\"og:site_name\" content=\"Cooperative Extension: Cranberries\" \/>\n<meta property=\"article:modified_time\" content=\"2023-01-10T15:01:25+00:00\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/extension.umaine.edu\/cranberries\/grower-services\/degree-days\/\",\"url\":\"https:\/\/extension.umaine.edu\/cranberries\/grower-services\/degree-days\/\",\"name\":\"Growing Degree Days (GDD) - Cooperative Extension: Cranberries - University of Maine Cooperative Extension\",\"isPartOf\":{\"@id\":\"https:\/\/extension.umaine.edu\/cranberries\/#website\"},\"datePublished\":\"2010-02-04T21:55:16+00:00\",\"dateModified\":\"2023-01-10T15:01:25+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/extension.umaine.edu\/cranberries\/grower-services\/degree-days\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/extension.umaine.edu\/cranberries\/grower-services\/degree-days\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/extension.umaine.edu\/cranberries\/grower-services\/degree-days\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/extension.umaine.edu\/cranberries\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Grower Services\",\"item\":\"https:\/\/extension.umaine.edu\/cranberries\/grower-services\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Growing Degree Days (GDD)\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/extension.umaine.edu\/cranberries\/#website\",\"url\":\"https:\/\/extension.umaine.edu\/cranberries\/\",\"name\":\"Cooperative Extension: Cranberries\",\"description\":\"Information you can use. 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