{"id":849,"date":"2025-05-13T14:39:56","date_gmt":"2025-05-13T14:39:56","guid":{"rendered":"https:\/\/sites.rutgers.edu\/nursery-ipm\/?p=849"},"modified":"2025-08-27T19:42:54","modified_gmt":"2025-08-27T19:42:54","slug":"redheaded-pine-sawfly","status":"publish","type":"post","link":"https:\/\/sites.rutgers.edu\/nursery-ipm\/redheaded-pine-sawfly\/","title":{"rendered":"Redheaded Pine Sawfly"},"content":{"rendered":"<h2><strong>Redheaded Pine Sawfly (<em>Neodiprion lecontei<\/em>)<\/strong><\/h2>\n<h4><strong>GDD Window (base 50): 246-1388 (1st generation)<\/strong><\/h4>\n<h5><\/h5>\n<h4><strong>Overview:<\/strong><\/h4>\n<ul>\n<li><span data-usefontface=\"false\" data-contrast=\"none\">Overwinter as prepupae in small (\u00bd inch), brown cocoons in the soil<\/span>\u200b<\/li>\n<li><span data-usefontface=\"false\" data-contrast=\"none\">Adults resemble flies or bees,\u00a0\u00bd&#8221; long, brown, with stout bodies<\/span>\u200b<\/li>\n<li><span data-usefontface=\"false\" data-contrast=\"none\">Females lay their\u00a0eggs in slits they cut into needles and leaves<\/span>\u200b<\/li>\n<li><b><span data-usefontface=\"false\" data-contrast=\"none\">Larvae\u00a0are immature wasps<\/span><\/b><span data-usefontface=\"false\" data-contrast=\"none\">\u00a0that\u00a0resemble tiny caterpillars; they reach\u00a0 1-<\/span><span data-usefontface=\"false\" data-contrast=\"none\">inch-long worm-like insects having reddish heads, yellowish-white bodies,\u00a0<\/span><span data-usefontface=\"false\" data-contrast=\"none\">and black spots<\/span>\u200b<\/li>\n<li><span data-usefontface=\"false\" data-contrast=\"none\">Larvae feed in groups of a couple dozen or more &amp; defoliate terminal\u00a0<\/span><span data-usefontface=\"false\" data-contrast=\"none\">branches;\u00a02 generations per year<\/span>\u200b<\/li>\n<li><span data-usefontface=\"false\" data-contrast=\"none\">Some prepupae develop the following year, some take 2 or more years<\/span>\u200b<\/li>\n<li><span data-usefontface=\"false\" data-contrast=\"none\">Cause defoliation or plant death, needle discoloration, and straw-like needle\u00a0<\/span><span data-usefontface=\"false\" data-contrast=\"none\">remains with frass being found beneath the trees<\/span>\u200b<\/li>\n<li><b><span data-usefontface=\"false\" data-contrast=\"none\">Host plants:\u00a0<\/span><\/b><span data-usefontface=\"false\" data-contrast=\"none\">Conifers (spruces, cedars, larches)<\/span>\u200b\n<ul>\n<li><span data-usefontface=\"false\" data-contrast=\"none\">Shortleaf, loblolly, slash, jack, red, longleaf, pitch, Swiss, mountain, <\/span><span data-usefontface=\"false\" data-contrast=\"none\">white, and\u00a0<\/span><span data-usefontface=\"false\" data-contrast=\"none\">mugo<\/span><span data-usefontface=\"false\" data-contrast=\"none\">\u00a0pines\u00a0<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4><strong>Management:<\/strong><\/h4>\n<h5><strong>Cultural Practices:<\/strong><\/h5>\n<ul>\n<li data-charcodes=\"111\" data-font=\"Courier New,monospace\" data-buautonum=\"8\" data-margin=\"1260\" data-aria-posinset=\"2\" data-aria-level=\"2\"><b><span data-usefontface=\"false\" data-contrast=\"none\">Natural predators:<\/span><\/b><span data-usefontface=\"false\" data-contrast=\"none\"> birds, rodents, <\/span><span data-usefontface=\"false\" data-contrast=\"none\">predatory beetles, parasitic wasps<\/span>\u200b<\/li>\n<li data-charcodes=\"111\" data-font=\"Courier New,monospace\" data-buautonum=\"8\" data-margin=\"1260\" data-aria-posinset=\"3\" data-aria-level=\"2\"><span data-usefontface=\"false\" data-contrast=\"none\">Reduce plant stress<\/span>\u200b<\/li>\n<li data-charcodes=\"111\" data-font=\"Courier New,monospace\" data-buautonum=\"8\" data-margin=\"1260\" data-aria-posinset=\"4\" data-aria-level=\"2\"><span data-usefontface=\"false\" data-contrast=\"none\">Hand pick and destroy isolated <\/span><span data-usefontface=\"false\" data-contrast=\"none\">infestations<\/span>\u200b<\/li>\n<li data-charcodes=\"111\" data-font=\"Courier New,monospace\" data-buautonum=\"8\" data-margin=\"1260\" data-aria-posinset=\"5\" data-aria-level=\"2\"><span data-usefontface=\"false\" data-contrast=\"none\">Strike branches to cause larvae to fall, <\/span><span data-usefontface=\"false\" data-contrast=\"none\">and collect them in a bucket of soapy <\/span><span data-usefontface=\"false\" data-contrast=\"none\">water<\/span><\/li>\n<\/ul>\n<p><strong style=\"color: inherit;font-size: 1.2em\">Materials:<\/strong><\/p>\n<ul>\n<li style=\"font-weight: 400\" data-charcodes=\"111\" data-font=\"Courier New,monospace\" data-buautonum=\"8\" data-margin=\"540\" data-aria-posinset=\"1\" data-aria-level=\"1\"><b><span data-usefontface=\"false\" data-contrast=\"none\">Contact insecticides:<\/span><\/b><span data-usefontface=\"false\" data-contrast=\"none\">\u00a0<\/span>\u200b\n<ul>\n<li data-charcodes=\"111\" data-font=\"Courier New,monospace\" data-buautonum=\"8\" data-margin=\"1260\" data-aria-posinset=\"2\" data-aria-level=\"2\"><span data-usefontface=\"false\" data-contrast=\"none\">Pyrethroids [3]: &#8211;<\/span><span data-usefontface=\"false\" data-contrast=\"none\">thrins<\/span>\u200b<\/li>\n<li data-charcodes=\"111\" data-font=\"Courier New,monospace\" data-buautonum=\"8\" data-margin=\"1260\" data-aria-posinset=\"3\" data-aria-level=\"2\"><span data-usefontface=\"false\" data-contrast=\"none\">Carbamates [1A]: carbaryl<\/span><b><\/b>\u200b<span style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;font-size: 1rem\">\u200b<\/span><\/li>\n<\/ul>\n<\/li>\n<li data-charcodes=\"111\" data-font=\"Courier New,monospace\" data-buautonum=\"8\" data-margin=\"540\" data-aria-posinset=\"7\" data-aria-level=\"1\"><b style=\"font-weight: 400\"><span data-usefontface=\"false\" data-contrast=\"none\">Considerations:<\/span><\/b>\u200b\n<ul style=\"font-weight: 400\">\n<li data-charcodes=\"111\" data-font=\"Courier New,monospace\" data-buautonum=\"8\" data-margin=\"1260\" data-aria-posinset=\"15\" data-aria-level=\"2\"><span class=\"LineBox  BCX0 SCXP26313877\"><span class=\"TextRun  BCX0 SCXP26313877\" lang=\"EN-US\" xml:lang=\"EN-US\" data-usefontface=\"false\" data-contrast=\"none\"><span class=\"NormalTextRun  BCX0 SCXP26313877\">Will impact non-target species. Be mindful <\/span><\/span><\/span><span class=\"LineBox  BCX0 SCXP26313877\"><span class=\"TextRun  BCX0 SCXP26313877\" lang=\"EN-US\" xml:lang=\"EN-US\" data-usefontface=\"false\" data-contrast=\"none\"><span class=\"NormalTextRun  BCX0 SCXP26313877\">of overapplying and timing of sprays.<\/span><\/span><\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h5><strong>Biorationals:<\/strong><\/h5>\n<ul>\n<li data-charcodes=\"111\" data-font=\"Courier New,monospace\" data-buautonum=\"8\" data-margin=\"1260\" data-aria-posinset=\"2\" data-aria-level=\"2\"><span data-usefontface=\"false\" data-contrast=\"none\">Spinosyns [5]; Spinosad<\/span>\u200b<\/li>\n<li data-charcodes=\"111\" data-font=\"Courier New,monospace\" data-buautonum=\"8\" data-margin=\"1260\" data-aria-posinset=\"3\" data-aria-level=\"2\"><span data-usefontface=\"false\" data-contrast=\"none\">Horticultural soaps and oils<\/span>\u200b\n<ul>\n<li data-charcodes=\"167\" data-font=\"Wingdings,Sans-Serif\" data-buautonum=\"8\" data-margin=\"1980\" data-aria-posinset=\"4\" data-aria-level=\"3\"><span data-usefontface=\"false\" data-contrast=\"none\">Effective on young larvae, <\/span><span data-usefontface=\"false\" data-contrast=\"none\">but less so for larger <\/span><span data-usefontface=\"false\" data-contrast=\"none\">larvae<\/span>\u200b<\/li>\n<\/ul>\n<\/li>\n<li data-charcodes=\"111\" data-font=\"Courier New,monospace\" data-buautonum=\"8\" data-margin=\"1260\" data-aria-posinset=\"5\" data-aria-level=\"2\"><span data-usefontface=\"false\" data-contrast=\"none\">Bt<\/span><span data-usefontface=\"false\" data-contrast=\"none\">\u00a0is<\/span><b><span data-usefontface=\"false\" data-contrast=\"none\">\u00a0not<\/span><\/b><span data-usefontface=\"false\" data-contrast=\"none\">\u00a0effective<\/span><\/li>\n<\/ul>\n<figure id=\"attachment_850\" aria-describedby=\"caption-attachment-850\" style=\"width: 300px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-850\" src=\"https:\/\/sites.rutgers.edu\/nursery-ipm\/wp-content\/uploads\/sites\/1396\/2025\/06\/m10-Pine-Sawflies-Red-Headed-300x169.jpg\" alt=\"\" width=\"300\" height=\"169\" srcset=\"https:\/\/sites.rutgers.edu\/nursery-ipm\/wp-content\/uploads\/sites\/1396\/2025\/06\/m10-Pine-Sawflies-Red-Headed-300x169.jpg 300w, https:\/\/sites.rutgers.edu\/nursery-ipm\/wp-content\/uploads\/sites\/1396\/2025\/06\/m10-Pine-Sawflies-Red-Headed-768x432.jpg 768w, https:\/\/sites.rutgers.edu\/nursery-ipm\/wp-content\/uploads\/sites\/1396\/2025\/06\/m10-Pine-Sawflies-Red-Headed.jpg 800w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><figcaption id=\"caption-attachment-850\" class=\"wp-caption-text\">The 2nd generation of redheaded pine sawflies can potentially still be found actively feeding into the month of October on 2-3 needle pines. (Photo Credit: Steven K. Rettke, Rutgers Coop. Ext.)<\/figcaption><\/figure>\n<figure id=\"attachment_851\" aria-describedby=\"caption-attachment-851\" style=\"width: 300px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-851\" src=\"https:\/\/sites.rutgers.edu\/nursery-ipm\/wp-content\/uploads\/sites\/1396\/2025\/06\/14-Pine-Sawflies-Red-Headed-2-Pupal-case-300x225.jpg\" alt=\"\" width=\"300\" height=\"225\" srcset=\"https:\/\/sites.rutgers.edu\/nursery-ipm\/wp-content\/uploads\/sites\/1396\/2025\/06\/14-Pine-Sawflies-Red-Headed-2-Pupal-case-300x225.jpg 300w, https:\/\/sites.rutgers.edu\/nursery-ipm\/wp-content\/uploads\/sites\/1396\/2025\/06\/14-Pine-Sawflies-Red-Headed-2-Pupal-case-768x576.jpg 768w, https:\/\/sites.rutgers.edu\/nursery-ipm\/wp-content\/uploads\/sites\/1396\/2025\/06\/14-Pine-Sawflies-Red-Headed-2-Pupal-case.jpg 800w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><figcaption id=\"caption-attachment-851\" class=\"wp-caption-text\">Pupal case of 1st generation redheaded pine sawfly attached to a branch. It will emerge as an adult wasp &amp; lay eggs to begin the 2nd generation during the last half of the summer. (Photo Credit: Steven K. Rettke, Rutgers Coop. Ext.)<\/figcaption><\/figure>\n<div class=\"mceTemp\"><\/div>\n<h6><\/h6>\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>Redheaded Pine Sawfly (Neodiprion lecontei) GDD Window (base 50): 246-1388 (1st generation) Overview: Overwinter as prepupae in small (\u00bd inch), brown cocoons in the soil\u200b Adults resemble flies or bees,\u00a0\u00bd&#8221; &hellip; <a href=\"https:\/\/sites.rutgers.edu\/nursery-ipm\/redheaded-pine-sawfly\/\" class=\"\">Read More<\/a><\/p>\n","protected":false},"author":3407,"featured_media":850,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[15],"tags":[],"class_list":["post-849","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-pests"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Redheaded Pine Sawfly - 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\/redheaded-pine-sawfly\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Redheaded Pine Sawfly - Nursery IPM\" \/>\n<meta property=\"og:description\" content=\"Redheaded Pine Sawfly (Neodiprion lecontei) GDD Window (base 50): 246-1388 (1st generation) Overview: Overwinter as prepupae in small (\u00bd inch), brown cocoons in the soil\u200b Adults resemble flies or bees,\u00a0\u00bd&#8221; &hellip; Read More\" \/>\n<meta property=\"og:url\" content=\"https:\/\/sites.rutgers.edu\/nursery-ipm\/redheaded-pine-sawfly\/\" \/>\n<meta property=\"og:site_name\" content=\"Nursery IPM\" \/>\n<meta property=\"article:published_time\" content=\"2025-05-13T14:39:56+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-08-27T19:42:54+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/sites.rutgers.edu\/nursery-ipm\/wp-content\/uploads\/sites\/1396\/2025\/06\/m10-Pine-Sawflies-Red-Headed.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"800\" \/>\n\t<meta property=\"og:image:height\" content=\"450\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Erin O. 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