{"id":344,"date":"2023-04-21T20:32:04","date_gmt":"2023-04-21T20:32:04","guid":{"rendered":"https:\/\/blogs.oregonstate.edu\/hazelnuts\/?p=344"},"modified":"2023-04-21T21:16:19","modified_gmt":"2023-04-21T21:16:19","slug":"low-heat-units-indicate-late-start-to-2023-season","status":"publish","type":"post","link":"https:\/\/blogs.oregonstate.edu\/hazelnuts\/low-heat-units-indicate-late-start-to-2023-season\/","title":{"rendered":"Low heat units indicate late start to 2023 season"},"content":{"rendered":"<div class=\"wp-block-site-logo\"><a href=\"https:\/\/blogs.oregonstate.edu\/hazelnuts\/\" class=\"custom-logo-link\" rel=\"home\"><img loading=\"lazy\" decoding=\"async\" width=\"669\" height=\"100\" src=\"https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2022\/07\/page-header-with-labels-wide-1.png\" class=\"custom-logo\" alt=\"Hazelnut Field Notes\" srcset=\"https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2022\/07\/page-header-with-labels-wide-1.png 3000w, https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2022\/07\/page-header-with-labels-wide-1-300x45.png 300w, https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2022\/07\/page-header-with-labels-wide-1-1024x154.png 1024w, https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2022\/07\/page-header-with-labels-wide-1-768x115.png 768w, https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2022\/07\/page-header-with-labels-wide-1-1536x230.png 1536w, https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2022\/07\/page-header-with-labels-wide-1-2048x307.png 2048w\" sizes=\"auto, (max-width: 669px) 100vw, 669px\" \/><\/a><\/div>\n\n<div class=\"wp-block-post-author\"><div class=\"wp-block-post-author__avatar\"><img alt='' src='https:\/\/secure.gravatar.com\/avatar\/9f5a51f287413adad84e67a832e9e523a4c0aef88968d0403087af52369b6cb5?s=48&#038;d=mm&#038;r=g' srcset='https:\/\/secure.gravatar.com\/avatar\/9f5a51f287413adad84e67a832e9e523a4c0aef88968d0403087af52369b6cb5?s=96&#038;d=mm&#038;r=g 2x' class='avatar avatar-48 photo' height='48' width='48' \/><\/div><div class=\"wp-block-post-author__content\"><p class=\"wp-block-post-author__name\">Nik Wiman<\/p><\/div><\/div>\n\n<div class=\"wp-block-post-date\"><time datetime=\"2023-04-21T20:32:04+00:00\">April 21, 2023<\/time><\/div>\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p>Winter is holding us tight this year in the Willamette Valley, but it may be finally losing its grip. <a href=\"https:\/\/www.ovs.com\/blogs\/the-wxcafe\/gonna-love-it\" target=\"_blank\" rel=\"noreferrer noopener\">A break in the rain and warmer temperatures  in the forecast<\/a> will be a relief for hazelnut growers with orchards susceptible to <a href=\"https:\/\/bpp.oregonstate.edu\/efb\">eastern filbert blight (EFB)<\/a>. Rain spreads the spores of the fungal  pathogen <em>Anisogramma anomala<\/em> to the susceptible meristem tissue as the trees break bud an enter the shoot elongation phase. It has been difficult to find a break in the rain to get the necessary fungicides applied. More than 5 inches of rain have fallen since April 1 at the North Willamette Research and Extension Center in Aurora.<\/p>\n\n\n\n<p>Its not just the rain, it has also been very cool in the Willamette Valley with low elevation snow levels and late freeze events. So how far behind are we on heat unit accumulation? The table below indicates that growing degree days (lower threshold 50<sup>o<\/sup> F) accumulated since January 1 are running roughly a month behind last season, and 3 weeks behind the 30-year normal on average across 4 sites in the Valley. Expect pests like budmite and filbertworm to be later (<a href=\"https:\/\/blogs.oregonstate.edu\/hazelnuts\/hazelnut-aphids-are-out\/\" target=\"_blank\" rel=\"noreferrer noopener\">but not aphids<\/a>) and it could be another late hazelnut harvest. Time will tell if we can catch up, but right now it looks like another late year. <\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1867\" height=\"1400\" src=\"https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2023\/04\/IMG_1682-edited.jpeg\" alt=\"\" class=\"wp-image-351\" srcset=\"https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2023\/04\/IMG_1682-edited.jpeg 1867w, https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2023\/04\/IMG_1682-edited-300x225.jpeg 300w, https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2023\/04\/IMG_1682-edited-1024x768.jpeg 1024w, https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2023\/04\/IMG_1682-edited-768x576.jpeg 768w, https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2023\/04\/IMG_1682-edited-1536x1152.jpeg 1536w\" sizes=\"auto, (max-width: 1867px) 100vw, 1867px\" \/><figcaption class=\"wp-element-caption\">Late blooming almonds in a research trial at the North Willamette Research and Extension Center typically bloom at the end of March, but didn&#8217;t bloom until mid-April in 2023.<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img decoding=\"async\" src=\"https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2023\/04\/IMG_1792-edited-1.jpeg\" alt=\"\" class=\"wp-image-367\" width=\"323\" srcset=\"https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2023\/04\/IMG_1792-edited-1.jpeg 2520w, https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2023\/04\/IMG_1792-edited-1-300x225.jpeg 300w, https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2023\/04\/IMG_1792-edited-1-1024x768.jpeg 1024w, https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2023\/04\/IMG_1792-edited-1-768x576.jpeg 768w, https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2023\/04\/IMG_1792-edited-1-1536x1152.jpeg 1536w, https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2023\/04\/IMG_1792-edited-1-2048x1536.jpeg 2048w\" sizes=\"(max-width: 2520px) 100vw, 2520px\" \/><figcaption class=\"wp-element-caption\">Hazelnuts in the Willamette Valley are still pushing leaves from buds and leaves are expanding. Orchards have been very wet, and orchard  access has been difficult this spring. Some growers have been waiting for a weather break to plant new orchards so there will be some late plantings.<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"906\" height=\"234\" src=\"https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2023\/04\/DD-table-1.jpg\" alt=\"\" class=\"wp-image-362\" srcset=\"https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2023\/04\/DD-table-1.jpg 906w, https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2023\/04\/DD-table-1-300x77.jpg 300w, https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2023\/04\/DD-table-1-768x198.jpg 768w\" sizes=\"auto, (max-width: 906px) 100vw, 906px\" \/><figcaption class=\"wp-element-caption\">Accumulated growing degree days (GDD; base 50 F) at Willamette Valley weather stations. Degree day heat units drive development in plants, insects, and other organisms that depend on heat from the environment to drive metababolic processes. The degree day calculator at <a href=\"https:\/\/uspest.org\/cgi-bin\/ddmodel.us?spp=aaa&amp;uco=1\" target=\"_blank\" rel=\"noreferrer noopener\">USPest.org<\/a> can be used to calculate GDD.<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Winter is holding us tight this year in the Willamette Valley, but it may be finally losing its grip. A break in the rain and warmer temperatures in the forecast will be a relief for hazelnut growers with orchards susceptible &hellip; <a href=\"https:\/\/blogs.oregonstate.edu\/hazelnuts\/low-heat-units-indicate-late-start-to-2023-season\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":8267,"featured_media":346,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[19,27,18],"tags":[48,49,47],"class_list":["post-344","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-disease","category-horticulture","category-ipm","tag-degree-days","tag-heat-units","tag-weather"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Low heat units indicate late start to 2023 season - Hazelnut Field Notes<\/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:\/\/blogs.oregonstate.edu\/hazelnuts\/low-heat-units-indicate-late-start-to-2023-season\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Low heat units indicate late start to 2023 season\" \/>\n<meta property=\"og:description\" content=\"Growing degree days accumulated since January 1 are running roughly a month behind last season, and 3 weeks behind the 30-year normal on average across 4 sites in the Valley.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blogs.oregonstate.edu\/hazelnuts\/low-heat-units-indicate-late-start-to-2023-season\/\" \/>\n<meta property=\"og:site_name\" content=\"Hazelnut Field Notes\" \/>\n<meta property=\"article:published_time\" content=\"2023-04-21T20:32:04+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-04-21T21:16:19+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2023\/04\/IMG_1792-edited-1.jpeg\" \/>\n\t<meta property=\"og:image:width\" content=\"2520\" \/>\n\t<meta property=\"og:image:height\" content=\"1890\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Nik Wiman\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:image\" content=\"https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2023\/04\/IMG_1793-edited-scaled.jpeg\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Nik Wiman\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/blogs.oregonstate.edu\\\/hazelnuts\\\/low-heat-units-indicate-late-start-to-2023-season\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/blogs.oregonstate.edu\\\/hazelnuts\\\/low-heat-units-indicate-late-start-to-2023-season\\\/\"},\"author\":{\"name\":\"Nik Wiman\",\"@id\":\"https:\\\/\\\/blogs.oregonstate.edu\\\/hazelnuts\\\/#\\\/schema\\\/person\\\/ff0e6789ecab0355608a8bf4a9923f76\"},\"headline\":\"Low heat units indicate late start to 2023 season\",\"datePublished\":\"2023-04-21T20:32:04+00:00\",\"dateModified\":\"2023-04-21T21:16:19+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/blogs.oregonstate.edu\\\/hazelnuts\\\/low-heat-units-indicate-late-start-to-2023-season\\\/\"},\"wordCount\":347,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/blogs.oregonstate.edu\\\/hazelnuts\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/blogs.oregonstate.edu\\\/hazelnuts\\\/low-heat-units-indicate-late-start-to-2023-season\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/osu-wams-blogs-uploads.s3.amazonaws.com\\\/blogs.dir\\\/5787\\\/files\\\/2023\\\/04\\\/DD-table.jpg\",\"keywords\":[\"degree-days\",\"heat units\",\"weather\"],\"articleSection\":[\"Disease\",\"Horticulture\",\"IPM\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/blogs.oregonstate.edu\\\/hazelnuts\\\/low-heat-units-indicate-late-start-to-2023-season\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/blogs.oregonstate.edu\\\/hazelnuts\\\/low-heat-units-indicate-late-start-to-2023-season\\\/\",\"url\":\"https:\\\/\\\/blogs.oregonstate.edu\\\/hazelnuts\\\/low-heat-units-indicate-late-start-to-2023-season\\\/\",\"name\":\"Low heat units indicate late start to 2023 season - 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