{"id":638,"date":"2010-02-05T15:02:45","date_gmt":"2010-02-05T20:02:45","guid":{"rendered":"https:\/\/extension.umaine.edu\/cranberries\/?page_id=638"},"modified":"2019-02-04T19:42:22","modified_gmt":"2019-02-04T19:42:22","slug":"umbrella-bloom","status":"publish","type":"page","link":"https:\/\/extension.umaine.edu\/cranberries\/grower-services\/diseases\/umbrella-bloom\/","title":{"rendered":"Umbrella Bloom"},"content":{"rendered":"<p><strong>Description:<\/strong> Umbrella bloom is\u00a0the terminology\u00a0used to describe a particular kind of abnormal flowering seen in cranberries, where the vegetative portion of the terminal bud does not grow, leaving instead an &#8216;umbrella&#8217; of blossoms at the tip (see photos below). Normally, one would expect to have anywhere from 1-2&#8243; of upright growth above the uppermost flower, as seen in the third photo below. Without the new-growth stem and its accompanying leaves, it is believed that there is not enough photosynthetic carbon available to the upright to satisfy the nutritional needs of&#8211;typically&#8211;more than just one cranberry, at best (despite the number of blossoms that may be present).<\/p>\n\n\t\t<style type=\"text\/css\">\n\t\t\t#gallery-1 {\n\t\t\t\tmargin: auto;\n\t\t\t}\n\t\t\t#gallery-1 .gallery-item {\n\t\t\t\tfloat: left;\n\t\t\t\tmargin-top: 10px;\n\t\t\t\ttext-align: center;\n\t\t\t\twidth: 33%;\n\t\t\t}\n\t\t\t#gallery-1 img {\n\t\t\t\tborder: 2px solid #cfcfcf;\n\t\t\t}\n\t\t\t#gallery-1 .gallery-caption {\n\t\t\t\tmargin-left: 0;\n\t\t\t}\n\t\t\t\/* see gallery_shortcode() in wp-includes\/media.php *\/\n\t\t<\/style>\n\t\t<div id='gallery-1' class='gallery galleryid-638 gallery-columns-3 gallery-size-thumbnail'><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/Umbrella-Bloom-070807a.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/Umbrella-Bloom-070807a-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Example of Umbrella Bloom in a Maine cranberry bed\" aria-describedby=\"gallery-1-641\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/Umbrella-Bloom-070807a-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/Umbrella-Bloom-070807a-32x32.jpg 32w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-641'>\n\t\t\t\tExample of &#8216;Umbrella Bloom&#8217; in a Maine cranberry bed\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon portrait'>\n\t\t\t\t<a href='https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/Umbrella-Bloom-070807b.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/Umbrella-Bloom-070807b-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Umbrella Bloom - photo taken July 8th, 2007 (Maine cranberry bed)\" aria-describedby=\"gallery-1-642\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/Umbrella-Bloom-070807b-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/Umbrella-Bloom-070807b-32x32.jpg 32w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-642'>\n\t\t\t\t2nd example of &#8216;Umbrella Bloom&#8217; in a Maine cranberry bed\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/NormalUpright.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/NormalUpright-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"a cranberry upright in bloom, showing a normal amount of stem growth above the flowers\" aria-describedby=\"gallery-1-640\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/NormalUpright-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/NormalUpright-32x32.jpg 32w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-640'>\n\t\t\t\tA cranberry upright showing a normal amount of stem  growth above the flowers (versus uprights in adjacent photos with &#8216;Umbrella Bloom&#8217;)\n\t\t\t\t<\/dd><\/dl><br style=\"clear: both\" \/>\n\t\t<\/div>\n\n<hr \/>\n<p><strong>Cause (or causes):<\/strong> The most apparent cause of umbrella bloom\u00a0is\u00a0reported (but with very scarce literature on the subject)\u00a0to be a lack of exposure to temperatures low enough to fulfill the chilling requirement of the plant during its dormant&#8211;or resting&#8211;period.\u00a0When furnished with natural lighting, cranberry plants in the northeastern United States need a minimum of about 1700 hours of exposure to temperatures below 45\u00baF (older studies found the number to be 2500 hours, but that was in the absence of natural lighting). Studies in Oregon suggest only 500 hours are needed there. But regardless of the number, it is believed that if the number falls short of what is needed, umbrella bloom will occur. <strong>It may also be true that chilling hours could be lost during the characteristic \u2018ups and downs\u2019 of temperatures experienced in December and January in the northeast, in effect resetting\u00a0the cranberry plant&#8217;s internal &#8216;cold counter&#8217; to zero and forcing the number of hours below 45\u00baF to begin accumulating all over again.<\/strong><\/p>\n<p>Some additional causes of umbrella bloom that have been suggested in the literature (and suspected, especially in Maine) are<strong> frost injury<\/strong> or other types of damage to the terminal bud of an upright, such as <strong>insect injury<\/strong> from cranberry tipworm feeding, for example, or from that of<strong> mites<\/strong>.<\/p>\n<hr \/>\n","protected":false},"excerpt":{"rendered":"<p>Description: Umbrella bloom is\u00a0the terminology\u00a0used to describe a particular kind of abnormal flowering seen in cranberries, where the vegetative portion of the terminal bud does not grow, leaving instead an &#8216;umbrella&#8217; of blossoms at the tip (see photos below). Normally, one would expect to have anywhere from 1-2&#8243; of upright growth above the uppermost flower, [&hellip;]<\/p>\n","protected":false},"author":60,"featured_media":0,"parent":501,"menu_order":12,"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-638","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>Umbrella Bloom - 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\/diseases\/umbrella-bloom\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Umbrella Bloom - Cooperative Extension: Cranberries - University of Maine Cooperative Extension\" \/>\n<meta property=\"og:description\" content=\"Description: Umbrella bloom is\u00a0the terminology\u00a0used to describe a particular kind of abnormal flowering seen in cranberries, where the vegetative portion of the terminal bud does not grow, leaving instead an &#8216;umbrella&#8217; of blossoms at the tip (see photos below). 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