{"id":155,"date":"2022-07-23T01:14:46","date_gmt":"2022-07-23T01:14:46","guid":{"rendered":"https:\/\/blogs.oregonstate.edu\/hazelnuts\/?p=155"},"modified":"2022-08-11T01:21:52","modified_gmt":"2022-08-11T01:21:52","slug":"filbertworm-eggs-in-the-orchard","status":"publish","type":"post","link":"https:\/\/blogs.oregonstate.edu\/hazelnuts\/filbertworm-eggs-in-the-orchard\/","title":{"rendered":"Filbertworm eggs in the orchard"},"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\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\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=\"2022-07-23T01:14:46+00:00\">July 23, 2022<\/time><\/div>\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\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\" style=\"flex-basis:50%\">\n<p>Orchards in the Willamette Valley have now received <a rel=\"noreferrer noopener\" href=\"https:\/\/cropconnect.com\/custom\/OSU\/\" target=\"_blank\">enough heat units<\/a> to have filbertworm eggs (&gt;815 degree-days since April 1) and most have now achieved  first egg hatch (955 degree-days). Some orchards will already have a few larvae entering nuts (1022 degree-days). You should have first cover sprays on by now if you are treating based on moth captures in pheromone traps or a history of pressure. We put out our trial on Monday just ahead of egg hatch for our location.<\/p>\n\n\n\n<p>Note that moth counts have yet to peak and by the time they do peak at 1188 degree-days, nut infestation has already occurred from the reproductive efforts of the first moths that emerged. Many of us have concerns about the phenology model for filbertworm (<a href=\"https:\/\/uspest.org\/wea\/wealib.html#fbw\" target=\"_blank\" rel=\"noreferrer noopener\">developed in 1983 by M.T. AliNiazee<\/a>) and its performance in our more variable climate these days.<\/p>\n\n\n\n<p>This week OSU graduate student Erica Rudolph was out looking for signs of eggs that the model predicted should be out there. On Tuesday the 19th she found a fresh filbertworm egg. This is not an easy task as the eggs are laid singly on leaves or clusters and they are very small. She is examining a lot of plant material.<\/p>\n\n\n\n<p>Today, July 22, Erica found two more eggs. One is intermediate in development and has darkened compared to the fresh egg. Some traces of the developing gut of the larvae are apparent. On the second egg found today, the black head capsule of the first instar larva is fully formed and showing, indicating that it is just about finished with embryonic development and is about to hatch!  So far so good for model predictions.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/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 is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2022\/07\/IMG_7587-768x1024.png\" alt=\"\" class=\"wp-image-156\" width=\"311\" height=\"414\" srcset=\"https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2022\/07\/IMG_7587-768x1024.png 768w, https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2022\/07\/IMG_7587-225x300.png 225w, https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2022\/07\/IMG_7587-1152x1536.png 1152w, https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2022\/07\/IMG_7587-1536x2048.png 1536w\" sizes=\"auto, (max-width: 311px) 100vw, 311px\" \/><figcaption>A very fresh filbertworm egg has a shiny chorion (shell) and creamy interior. Photo: Erica Rudolph<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2022\/07\/IMG_7616-1-768x1024.png\" alt=\"\" class=\"wp-image-160\" width=\"311\" height=\"414\" srcset=\"https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2022\/07\/IMG_7616-1-768x1024.png 768w, https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2022\/07\/IMG_7616-1-225x300.png 225w, https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2022\/07\/IMG_7616-1-1152x1536.png 1152w, https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2022\/07\/IMG_7616-1-1536x2048.png 1536w\" sizes=\"auto, (max-width: 311px) 100vw, 311px\" \/><figcaption>A developing filbertworm egg. Photo: Erica Rudolph<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n<figure class=\"aligncenter wp-block-post-featured-image\"><img loading=\"lazy\" decoding=\"async\" width=\"940\" height=\"198\" src=\"https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2022\/07\/IMG_7619-2-940x198.png\" class=\"attachment-post-thumbnail size-post-thumbnail wp-post-image\" alt=\"\" style=\"object-fit:cover;\" \/><\/figure>\n\n\n<p class=\"has-small-font-size\">Fully developed filbertworm egg with neonate larva ready to hatch. Photo: Erica Rudolph<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Orchards in the Willamette Valley have now received enough heat units to have filbertworm eggs (&gt;815 degree-days since April 1) and most have now achieved first egg hatch (955 degree-days). Some orchards will already have a few larvae entering nuts &hellip; <a href=\"https:\/\/blogs.oregonstate.edu\/hazelnuts\/filbertworm-eggs-in-the-orchard\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":8267,"featured_media":161,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[30,32,29,28,9,31],"class_list":["post-155","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ipm","tag-chorion","tag-cydia-latiferreana","tag-egg","tag-filbertworm","tag-hazelnut","tag-larva"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Filbertworm eggs in the orchard - 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\/filbertworm-eggs-in-the-orchard\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Filbertworm eggs in the orchard - Hazelnut Field Notes\" \/>\n<meta property=\"og:description\" content=\"Orchards in the Willamette Valley have now received enough heat units to have filbertworm eggs (&gt;815 degree-days since April 1) and most have now achieved first egg hatch (955 degree-days). Some orchards will already have a few larvae entering nuts &hellip; Continue reading &rarr;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blogs.oregonstate.edu\/hazelnuts\/filbertworm-eggs-in-the-orchard\/\" \/>\n<meta property=\"og:site_name\" content=\"Hazelnut Field Notes\" \/>\n<meta property=\"article:published_time\" content=\"2022-07-23T01:14:46+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-08-11T01:21:52+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/osu-wams-blogs-uploads.s3.amazonaws.com\/blogs.dir\/5787\/files\/2022\/07\/IMG_7619-2-1024x530.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1024\" \/>\n\t<meta property=\"og:image:height\" content=\"530\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Nik Wiman\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\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=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/blogs.oregonstate.edu\\\/hazelnuts\\\/filbertworm-eggs-in-the-orchard\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/blogs.oregonstate.edu\\\/hazelnuts\\\/filbertworm-eggs-in-the-orchard\\\/\"},\"author\":{\"name\":\"Nik Wiman\",\"@id\":\"https:\\\/\\\/blogs.oregonstate.edu\\\/hazelnuts\\\/#\\\/schema\\\/person\\\/ff0e6789ecab0355608a8bf4a9923f76\"},\"headline\":\"Filbertworm eggs in the orchard\",\"datePublished\":\"2022-07-23T01:14:46+00:00\",\"dateModified\":\"2022-08-11T01:21:52+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/blogs.oregonstate.edu\\\/hazelnuts\\\/filbertworm-eggs-in-the-orchard\\\/\"},\"wordCount\":313,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/blogs.oregonstate.edu\\\/hazelnuts\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/blogs.oregonstate.edu\\\/hazelnuts\\\/filbertworm-eggs-in-the-orchard\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/osu-wams-blogs-uploads.s3.amazonaws.com\\\/blogs.dir\\\/5787\\\/files\\\/2022\\\/07\\\/IMG_7619-2.png\",\"keywords\":[\"chorion\",\"Cydia latiferreana\",\"egg\",\"filbertworm\",\"hazelnut\",\"larva\"],\"articleSection\":[\"IPM\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/blogs.oregonstate.edu\\\/hazelnuts\\\/filbertworm-eggs-in-the-orchard\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/blogs.oregonstate.edu\\\/hazelnuts\\\/filbertworm-eggs-in-the-orchard\\\/\",\"url\":\"https:\\\/\\\/blogs.oregonstate.edu\\\/hazelnuts\\\/filbertworm-eggs-in-the-orchard\\\/\",\"name\":\"Filbertworm eggs in the orchard - 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