{"id":23913,"date":"2022-05-27T18:42:58","date_gmt":"2022-05-27T22:42:58","guid":{"rendered":"https:\/\/extension.umaine.edu\/blueberries\/?p=23913"},"modified":"2022-05-27T18:42:58","modified_gmt":"2022-05-27T22:42:58","slug":"cold-temperatures-during-night-from-may-24th-to-may-25-2022","status":"publish","type":"post","link":"https:\/\/extension.umaine.edu\/blueberries\/2022\/05\/27\/cold-temperatures-during-night-from-may-24th-to-may-25-2022\/","title":{"rendered":"Cold temperatures during night from May 24th to May 25, 2022"},"content":{"rendered":"

Cold temperatures were recorded at weather stations in Ellsworth, Eastbrook, Steuben, and Deblois.\u00a0 Temperatures were below 35 F from about 11pm to 6am over the night of May 24th to May 25th.\u00a0 Temperatures below 32 were present for 2 to 5 hours.\u00a0 The weather stations did not record temperatures below 28F at any of the sites but they are only a single point measure within the field.\u00a0 Other fields near by may have had lower temperatures.\u00a0 Two years ago cold temperatures (in many fields below 30F) during bloom killed flowers in some fields but also affected set fruit by killing them internally so they did not develop.\u00a0\u00a0 If you are concerned about your field, you can cut open some set fruit in low lying areas to see if they are darkened inside which indicates cold damage.<\/p>\n

Temperature effects on wild blueberry flowers and leaves according to Hall et al. 1971, Hall and Hildebrand, 1988, and Hicklenton et al., 2002.<\/p>\n\n\n\n\n\n\n\n
Temperature<\/strong><\/td>\nDamage<\/strong><\/td>\n<\/tr>\n
30.5\u00b0F<\/td>\nSlight injury to flowers, little effect on fruit set, occasional necrosis at edges of leaves<\/td>\n<\/tr>\n
28 \u00b0F<\/td>\nGreater than 2 hours, \u00a040 to 60% loss of fruit set in open flowers and 20 to 30% in closed flowers, unclear if berry weight is affected<\/td>\n<\/tr>\n
26\u00b0F<\/td>\nOpen flowers, after 2 hours, 75% of flowers lost resulting in little fruit set.\u00a0 After 2 hours, 50% of closed flowers do not open, but if they do open, little effect on fruit set. With increased time, fewer flowers open.<\/td>\n<\/tr>\n
Below 24\u00b0F<\/td>\nFlowers die, no fruit set, leaves are water soaked and may not recover<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Cold temperatures were recorded at weather stations in Ellsworth, Eastbrook, Steuben, and Deblois.\u00a0 Temperatures were below 35 F from about 11pm to 6am over the night of May 24th to May 25th.\u00a0 Temperatures below 32 were present for 2 to 5 hours.\u00a0 The weather stations did not record temperatures below 28F at any of the […]<\/p>\n","protected":false},"author":117,"featured_media":0,"comment_status":"closed","ping_status":"open","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":[163,85,1],"tags":[],"class_list":["post-23913","post","type-post","status-publish","format-standard","hentry","category-163","category-frost","category-uncategorized"],"yoast_head":"\nCold temperatures during night from May 24th to May 25, 2022 - Cooperative Extension: Maine Wild Blueberries - 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\/blueberries\/2022\/05\/27\/cold-temperatures-during-night-from-may-24th-to-may-25-2022\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cold temperatures during night from May 24th to May 25, 2022 - Cooperative Extension: Maine Wild Blueberries - University of Maine Cooperative Extension\" \/>\n<meta property=\"og:description\" content=\"Cold temperatures were recorded at weather stations in Ellsworth, Eastbrook, Steuben, and Deblois.\u00a0 Temperatures were below 35 F from about 11pm to 6am over the night of May 24th to May 25th.\u00a0 Temperatures below 32 were present for 2 to 5 hours.\u00a0 The weather stations did not record temperatures below 28F at any of the […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/extension.umaine.edu\/blueberries\/2022\/05\/27\/cold-temperatures-during-night-from-may-24th-to-may-25-2022\/\" \/>\n<meta property=\"og:site_name\" content=\"Cooperative Extension: Maine Wild Blueberries\" \/>\n<meta property=\"article:published_time\" content=\"2022-05-27T22:42:58+00:00\" \/>\n<meta name=\"author\" content=\"sannis\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"sannis\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/extension.umaine.edu\/blueberries\/2022\/05\/27\/cold-temperatures-during-night-from-may-24th-to-may-25-2022\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/extension.umaine.edu\/blueberries\/2022\/05\/27\/cold-temperatures-during-night-from-may-24th-to-may-25-2022\/\"},\"author\":{\"name\":\"sannis\",\"@id\":\"https:\/\/extension.umaine.edu\/blueberries\/#\/schema\/person\/10aacba2e2e840d9a021e5e9037f1c2c\"},\"headline\":\"Cold temperatures during night from May 24th to May 25, 2022\",\"datePublished\":\"2022-05-27T22:42:58+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/extension.umaine.edu\/blueberries\/2022\/05\/27\/cold-temperatures-during-night-from-may-24th-to-may-25-2022\/\"},\"wordCount\":254,\"articleSection\":[\"2022\",\"frost\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/extension.umaine.edu\/blueberries\/2022\/05\/27\/cold-temperatures-during-night-from-may-24th-to-may-25-2022\/\",\"url\":\"https:\/\/extension.umaine.edu\/blueberries\/2022\/05\/27\/cold-temperatures-during-night-from-may-24th-to-may-25-2022\/\",\"name\":\"Cold temperatures during night from May 24th to May 25, 2022 - 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