{"id":731,"date":"2025-04-08T13:47:33","date_gmt":"2025-04-08T13:47:33","guid":{"rendered":"https:\/\/sites.rutgers.edu\/nursery-ipm\/?p=731"},"modified":"2025-08-27T19:44:54","modified_gmt":"2025-08-27T19:44:54","slug":"boxwood-blight","status":"publish","type":"post","link":"https:\/\/sites.rutgers.edu\/nursery-ipm\/boxwood-blight\/","title":{"rendered":"Boxwood Blight"},"content":{"rendered":"<h2><strong>Boxwood Blight (<em>Calonectria pseudonaviculata<\/em>)<\/strong><\/h2>\n<h5><\/h5>\n<h4><strong>Overview:<\/strong><\/h4>\n<ul>\n<li>Fungal infection &#8211; caused by <em>Calonectria pseudonaviculata\u00a0<\/em><\/li>\n<li>Characterized by leaf spots, rapid defoliation, and stem lesions<\/li>\n<li>Leaves turn brown or yellow, with darker boarders<\/li>\n<li>Stem lesions are black streaks or cankers<\/li>\n<li>Spreads rapidly<\/li>\n<li><b><span data-scheme-color=\"@000000,,\" data-usefontface=\"false\" data-contrast=\"none\">Causes leaves to DROP-OFF<\/span><\/b>\u200b\n<ul>\n<li><i><span data-scheme-color=\"@000000,,\" data-usefontface=\"false\" data-contrast=\"none\">(hypersensitive response)<\/span><\/i>\u200b<\/li>\n<\/ul>\n<\/li>\n<li><b><span data-scheme-color=\"@000000,,\" data-usefontface=\"false\" data-contrast=\"none\">COOL\/wet\u00a0<\/span><\/b><span data-scheme-color=\"@000000,,\" data-usefontface=\"false\" data-contrast=\"none\">=\u00a0<\/span><span data-usefontface=\"false\" data-contrast=\"none\">black cankers &amp; white hyphae<\/span>\u200b\n<ul>\n<li><span data-scheme-color=\"@000000,,\" data-usefontface=\"false\" data-contrast=\"none\">Anytime we have prolonged 60F+ rain events<\/span>\u200b<\/li>\n<\/ul>\n<\/li>\n<li data-ccp-props=\"{&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559683&quot;:0,&quot;335559685&quot;:0,&quot;335559731&quot;:0,&quot;335559737&quot;:0,&quot;335562764&quot;:2,&quot;335562765&quot;:0.9,&quot;335562766&quot;:4,&quot;335562767&quot;:10,&quot;335562768&quot;:4,&quot;335562769&quot;:0}\"><b><span data-scheme-color=\"@000000,,\" data-usefontface=\"false\" data-contrast=\"none\">Sticky spores<\/span><\/b><span data-scheme-color=\"@000000,,\" data-usefontface=\"false\" data-contrast=\"none\">\u00a0\u2013\u00a0<\/span><span data-scheme-color=\"@000000,,\" data-usefontface=\"false\" data-contrast=\"none\">spreads VERY easily in water<\/span><\/li>\n<\/ul>\n<h4><strong>Management:<\/strong><\/h4>\n<ul>\n<li>Removed diseased leaves, stems, plants, soil (persistent<br \/>\nfor LONG periods) when DRY\u200b<\/li>\n<li>Protective fungicide applications\u200b\n<ul>\n<li>Fungicides applied at regular intervals\u200b<\/li>\n<li>[M05]: Chlorothalonil \u200b<\/li>\n<li>[M05 + 1] Chlorothalonil + Thiophanate methyl \u200b<\/li>\n<li>[11] Trifloxystrobin + [7] Fluopyram \u200b<\/li>\n<li>[11] Trifloxystrobin + [3] Triadimefon \u200b<\/li>\n<li>[M03] Mancozeb\u200b<\/li>\n<li>[12] Fludioxonil \u200b<\/li>\n<li>[3] Tebuconazole<\/li>\n<\/ul>\n<\/li>\n<li><a href=\"https:\/\/uspest.org\/risk\/boxwood_app?sta=\">USPEST Boxwood Blight Risk Model\u00a0<\/a>\n<ul>\n<li>If BWB is important to your business \u2013<a href=\"https:\/\/uspest.org\/cgi-bin\/account\"> Use the USPEST \u2013 PUSH Alerts \u2013 (click here)<\/a> \u2013 to setup weekly email alerts. Create an account, watch the tutorial, and then set up your subscriptions. You select which locations (as many as you like), days you want to receive emails, and what you would like to receive alerts about (BWB and a variety of other pests and diseases). Rutgers is not directly affiliated, however this is an incredible tool.<\/li>\n<\/ul>\n<\/li>\n<li><span class=\"TextRun MacChromeBold Underlined BCX0 SCXP162026515\" lang=\"EN-US\" xml:lang=\"EN-US\" data-usefontface=\"false\" data-contrast=\"none\"><span class=\"NormalTextRun SingleUnderline BCX0 SCXP162026515\">Watch for successive rainy, 60F+ days<\/span><\/span><\/li>\n<\/ul>\n<h4><strong>Boxwood Blight Quick Diagnostic:<\/strong><\/h4>\n<ul>\n<li>Take foliage, dampen it, place into a Ziploc bag or container\n<ul>\n<li>If white and fluffy: Boxwood Blight<\/li>\n<li>If bumpy and peach: Volutella<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4><strong>Boxwood Resources:<\/strong><\/h4>\n<ul>\n<li><a href=\"https:\/\/www.ars.usda.gov\/ARSUserFiles\/3122\/KramerEtAl2020.pdf\">CLICK HERE FOR 2020 \u2013 Boxwood blight resistant cultivar rankings (USDA).<\/a><\/li>\n<li><a href=\"https:\/\/www.boxwoodhealth.org\/research-updates\">Click here for additional BWB research updates<\/a><\/li>\n<li><a href=\"https:\/\/irp-cdn.multiscreensite.com\/5d757b5b\/files\/uploaded\/HRIBoxwoodHealthBMPs-V3-2020.pdf\">CLICK HERE FOR A FREE DOWNLOAD\u00a0\u2013 BOXWOOD HEALTH, Best Management Practices Production and Landscape Management (18 pages \u2013\u00a0<em>Version 3.0<\/em>)<\/a><\/li>\n<li><a href=\"https:\/\/www.hriresearch.org\/boxwood\">\u00a0Click here for more BWB initiatives<\/a><strong style=\"font-size: 1.2rem\">\u00a0<\/strong><\/li>\n<li><a href=\"https:\/\/plant-pest-advisory.rutgers.edu\/boxwood-blight-update-for-6-2020\/\">Click here for more detailed Boxwood blight posts with many other links and background information\u00a0<\/a><\/li>\n<\/ul>\n<div class=\"mceTemp\"><\/div>\n<figure id=\"attachment_733\" aria-describedby=\"caption-attachment-733\" style=\"width: 300px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-733\" src=\"https:\/\/sites.rutgers.edu\/nursery-ipm\/wp-content\/uploads\/sites\/1396\/2025\/06\/DSC_0152-300x200-1.jpg\" alt=\"\" width=\"300\" height=\"200\" \/><figcaption id=\"caption-attachment-733\" class=\"wp-caption-text\">Photo: Richard Buckley, Rutgers PDL<\/figcaption><\/figure>\n<figure id=\"attachment_734\" aria-describedby=\"caption-attachment-734\" style=\"width: 300px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-734\" src=\"https:\/\/sites.rutgers.edu\/nursery-ipm\/wp-content\/uploads\/sites\/1396\/2025\/06\/DSC_0128-300x200-1.jpg\" alt=\"\" width=\"300\" height=\"200\" \/><figcaption id=\"caption-attachment-734\" class=\"wp-caption-text\">Photo: Richard Buckley, Rutgers PDL<\/figcaption><\/figure>\n<figure id=\"attachment_735\" aria-describedby=\"caption-attachment-735\" style=\"width: 300px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-735\" src=\"https:\/\/sites.rutgers.edu\/nursery-ipm\/wp-content\/uploads\/sites\/1396\/2025\/06\/DSC_0066-300x200-1.jpg\" alt=\"\" width=\"300\" height=\"200\" \/><figcaption id=\"caption-attachment-735\" class=\"wp-caption-text\">Photo: Richard Buckley, Rutgers PDL<\/figcaption><\/figure>\n<figure id=\"attachment_736\" aria-describedby=\"caption-attachment-736\" style=\"width: 300px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-736\" src=\"https:\/\/sites.rutgers.edu\/nursery-ipm\/wp-content\/uploads\/sites\/1396\/2025\/06\/DSC_0088-300x200-1.jpg\" alt=\"\" width=\"300\" height=\"200\" \/><figcaption id=\"caption-attachment-736\" class=\"wp-caption-text\">Photo: Richard Buckley, Rutgers PDL<\/figcaption><\/figure>\n<figure id=\"attachment_737\" aria-describedby=\"caption-attachment-737\" style=\"width: 300px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-737\" src=\"https:\/\/sites.rutgers.edu\/nursery-ipm\/wp-content\/uploads\/sites\/1396\/2025\/06\/DSC_0138-300x200-1.jpg\" alt=\"\" width=\"300\" height=\"200\" \/><figcaption id=\"caption-attachment-737\" class=\"wp-caption-text\">Photo: Richard Buckley, Rutgers PDL<\/figcaption><\/figure>\n<h6><span class=\"LineBox SCXP56887253 BCX0\"><span class=\"TextRun SCXP56887253 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-usefontface=\"false\" data-contrast=\"none\"><span class=\"NormalTextRun SCXP56887253 BCX0\">Disclaimer<\/span><\/span><span class=\"TextRun SCXP56887253 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-usefontface=\"false\" data-contrast=\"none\"><span class=\"NormalTextRun SCXP56887253 BCX0\"> &#8211; Materials do not cover all possible control scenarios and are intended for licensed professionals. Tradenames do not imply\u00a0<\/span><\/span><\/span><span class=\"LineBox SCXP56887253 BCX0\"><span class=\"TextRun SCXP56887253 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-usefontface=\"false\" data-contrast=\"none\"><span class=\"NormalTextRun SCXP56887253 BCX0\">endorsement and are used as examples. You must strictly follow the label for each compound prior to use. Rutgers is not responsible for<\/span><\/span><\/span><span class=\"LineBox SCXP56887253 BCX0\"><span class=\"TextRun SCXP56887253 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-usefontface=\"false\" data-contrast=\"none\"><span class=\"NormalTextRun SCXP56887253 BCX0\">m is used materials or damages thereof. The label is the law. Labels will provide detailed information on use and restrictions. Additionally, <\/span><\/span><\/span><span class=\"LineBox SCXP56887253 BCX0\"><span class=\"TextRun SCXP56887253 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-usefontface=\"false\" data-contrast=\"none\"><span class=\"NormalTextRun SCXP56887253 BCX0\">application intervals, compatibility, surfactant use, PHI, PPE, important and other key information is described in detail. Always discuss\u00a0<\/span><\/span><\/span><span class=\"LineBox SCXP56887253 BCX0\"><span class=\"TextRun SCXP56887253 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-usefontface=\"false\" data-contrast=\"none\"><span class=\"NormalTextRun SCXP56887253 BCX0\">treatments with your local agents.\u00a0<\/span><\/span><span class=\"TextRun SCXP56887253 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-scheme-color=\"@C00000,,\" data-usefontface=\"false\" data-contrast=\"none\"><span class=\"NormalTextRun SCXP56887253 BCX0\">Note: Neonicotinoids can only be legally applied in commercial agriculture settings by licensed <\/span><\/span><\/span><span class=\"LineBox SCXP56887253 BCX0\"><span class=\"TextRun SCXP56887253 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-scheme-color=\"@C00000,,\" data-usefontface=\"false\" data-contrast=\"none\"><span class=\"NormalTextRun SCXP56887253 BCX0\">applicators.\u00a0<\/span><\/span><span class=\"TextRun SCXP56887253 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-scheme-color=\"@3B7F23,9,18:76000\" data-usefontface=\"false\" data-contrast=\"none\"><span class=\"NormalTextRun SCXP56887253 BCX0\">Guidelines and recommendations made in this presentation are specific to the state of New Jersey.\u00a0<\/span><\/span><\/span><\/h6>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Boxwood Blight (Calonectria pseudonaviculata) Overview: Fungal infection &#8211; caused by Calonectria pseudonaviculata\u00a0 Characterized by leaf spots, rapid defoliation, and stem lesions Leaves turn brown or yellow, with darker boarders Stem &hellip; <a href=\"https:\/\/sites.rutgers.edu\/nursery-ipm\/boxwood-blight\/\" class=\"\">Read More<\/a><\/p>\n","protected":false},"author":3407,"featured_media":738,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[16],"tags":[],"class_list":["post-731","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-diseases"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Boxwood Blight - Nursery IPM<\/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:\/\/sites.rutgers.edu\/nursery-ipm\/boxwood-blight\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Boxwood Blight - Nursery IPM\" \/>\n<meta property=\"og:description\" content=\"Boxwood Blight (Calonectria pseudonaviculata) Overview: Fungal infection &#8211; caused by Calonectria pseudonaviculata\u00a0 Characterized by leaf spots, rapid defoliation, and stem lesions Leaves turn brown or yellow, with darker boarders Stem &hellip; Read More\" \/>\n<meta property=\"og:url\" content=\"https:\/\/sites.rutgers.edu\/nursery-ipm\/boxwood-blight\/\" \/>\n<meta property=\"og:site_name\" content=\"Nursery IPM\" \/>\n<meta property=\"article:published_time\" content=\"2025-04-08T13:47:33+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-08-27T19:44:54+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/sites.rutgers.edu\/nursery-ipm\/wp-content\/uploads\/sites\/1396\/2025\/06\/DSC_0099-300x200-1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"300\" \/>\n\t<meta property=\"og:image:height\" content=\"200\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Erin O. 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