{"id":6965,"date":"2025-07-01T16:25:24","date_gmt":"2025-07-01T16:25:24","guid":{"rendered":"https:\/\/extension.umaine.edu\/cranberries\/?page_id=6965"},"modified":"2025-07-01T16:27:43","modified_gmt":"2025-07-01T16:27:43","slug":"damaging-stage-calendar-of-maine-cranberry-insect-pests","status":"publish","type":"page","link":"https:\/\/extension.umaine.edu\/cranberries\/damaging-stage-calendar-of-maine-cranberry-insect-pests\/","title":{"rendered":"Damaging Stage and Timing of Maine Cranberry Insect Pests (Calendar)"},"content":{"rendered":"<style>.kb-row-layout-id6965_a49326-7a > .kt-row-column-wrap{align-content:start;}:where(.kb-row-layout-id6965_a49326-7a > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}.kb-row-layout-id6965_a49326-7a > .kt-row-column-wrap{column-gap:var(--global-kb-gap-md, 2rem);row-gap:var(--global-kb-gap-md, 2rem);max-width:1100px;margin-left:auto;margin-right:auto;padding-top:60px;padding-right:60px;padding-bottom:60px;padding-left:60px;grid-template-columns:minmax(0, 1fr);}.kb-row-layout-id6965_a49326-7a{background-color:#e5f0f9;}.kb-row-layout-id6965_a49326-7a > .kt-row-layout-overlay{opacity:0.30;}@media all and (max-width: 1024px){.kb-row-layout-id6965_a49326-7a > .kt-row-column-wrap{padding-right:50px;padding-left:50px;grid-template-columns:minmax(0, 1fr);}}@media all and (max-width: 767px){.kb-row-layout-id6965_a49326-7a > .kt-row-column-wrap{padding-top:50px;padding-right:25px;padding-bottom:50px;padding-left:25px;grid-template-columns:minmax(0, 1fr);}}<\/style><div class=\"kb-row-layout-wrap kb-row-layout-id6965_a49326-7a alignfull kt-row-has-bg um-UMBlueHorizonsLightBlueTextBox wp-block-kadence-rowlayout\"><div class=\"kt-row-column-wrap kt-has-1-columns kt-row-layout-equal kt-tab-layout-inherit kt-mobile-layout-row kt-row-valign-top\">\n<style>.kadence-column6965_30f4da-b5 > .kt-inside-inner-col,.kadence-column6965_30f4da-b5 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column6965_30f4da-b5 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column6965_30f4da-b5 > .kt-inside-inner-col{flex-direction:column;}.kadence-column6965_30f4da-b5 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column6965_30f4da-b5 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column6965_30f4da-b5{position:relative;}@media all and (max-width: 1024px){.kadence-column6965_30f4da-b5 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column6965_30f4da-b5 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column6965_30f4da-b5\"><div class=\"kt-inside-inner-col\"><style>.kb-row-layout-id6965_cb2d12-8f > .kt-row-column-wrap{align-content:start;}:where(.kb-row-layout-id6965_cb2d12-8f > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}.kb-row-layout-id6965_cb2d12-8f > .kt-row-column-wrap{column-gap:var(--global-kb-gap-md, 2rem);row-gap:var(--global-kb-gap-md, 2rem);padding-top:30px;padding-right:60px;padding-bottom:30px;padding-left:60px;grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}.kb-row-layout-id6965_cb2d12-8f > .kt-row-layout-overlay{opacity:0.30;}@media all and (max-width: 1024px){.kb-row-layout-id6965_cb2d12-8f > .kt-row-column-wrap{padding-top:35px;padding-right:35px;padding-bottom:60px;padding-left:35px;grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}}@media all and (max-width: 767px){.kb-row-layout-id6965_cb2d12-8f > .kt-row-column-wrap{padding-bottom:35px;grid-template-columns:minmax(0, 1fr);}}<\/style><div class=\"kb-row-layout-wrap kb-row-layout-id6965_cb2d12-8f alignnone has-white-background-color kt-row-has-bg wp-block-kadence-rowlayout\"><div class=\"kt-row-column-wrap kt-has-2-columns kt-row-layout-right-golden kt-tab-layout-inherit kt-mobile-layout-row kt-row-valign-top\">\n<style>.kadence-column6965_2a3a00-7b > .kt-inside-inner-col,.kadence-column6965_2a3a00-7b > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column6965_2a3a00-7b > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column6965_2a3a00-7b > .kt-inside-inner-col{flex-direction:column;}.kadence-column6965_2a3a00-7b > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column6965_2a3a00-7b > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column6965_2a3a00-7b{position:relative;}@media all and (max-width: 1024px){.kadence-column6965_2a3a00-7b > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column6965_2a3a00-7b > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column6965_2a3a00-7b\"><div class=\"kt-inside-inner-col\">\n<p><em>text version equivalent of the image displayed at right:<\/em><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Winter Moth:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Winter moth inchworms<\/strong> [Female winter moths cannot fly, which fortunately slows the spread of this pest!]; <strong>Note:<\/strong> Winter moth larvae have yet to be captured on any of our Maine cranberry beds (only a few areas in Maine are known to have them currently&#8211;mostly southern and coastal communities), but they are perfectly content to stay and feed on cranberry buds when winds blow them from their host trees onto a cranberry bed; they&#8217;ve sometimes been a fairly significant problem on Massachusetts cranberry beds (the larvae begin feeding as early as April in Massachusetts)<\/li>\n\n\n\n<li><strong>Expected during:<\/strong> May 7th &#8211; June 17th<\/li>\n\n\n\n<li><strong>Variable or uncertain timing:<\/strong> May 1st &#8211; June 24th<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n<style>.kadence-column6965_25c9cf-1e > .kt-inside-inner-col,.kadence-column6965_25c9cf-1e > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column6965_25c9cf-1e > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column6965_25c9cf-1e > .kt-inside-inner-col{flex-direction:column;}.kadence-column6965_25c9cf-1e > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column6965_25c9cf-1e > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column6965_25c9cf-1e{position:relative;}@media all and (max-width: 1024px){.kadence-column6965_25c9cf-1e > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column6965_25c9cf-1e > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column6965_25c9cf-1e\"><div class=\"kt-inside-inner-col\"><style>.kb-image6965_e19db0-68 .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<figure class=\"wp-block-kadence-image kb-image6965_e19db0-68 size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"992\" height=\"817\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2020\/05\/Calendar-ME-Cranberry-Insect-Pests.jpg\" alt=\"Visual aid showing the damaging stage and timing of Maine cranberry insect pests (photo contents translated into text on the remainder of the page)\" class=\"kb-img wp-image-6542\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2020\/05\/Calendar-ME-Cranberry-Insect-Pests.jpg 992w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2020\/05\/Calendar-ME-Cranberry-Insect-Pests-300x247.jpg 300w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2020\/05\/Calendar-ME-Cranberry-Insect-Pests-768x633.jpg 768w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2020\/05\/Calendar-ME-Cranberry-Insect-Pests-105x86.jpg 105w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2020\/05\/Calendar-ME-Cranberry-Insect-Pests-317x261.jpg 317w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2020\/05\/Calendar-ME-Cranberry-Insect-Pests-423x348.jpg 423w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2020\/05\/Calendar-ME-Cranberry-Insect-Pests-634x522.jpg 634w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2020\/05\/Calendar-ME-Cranberry-Insect-Pests-846x697.jpg 846w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2020\/05\/Calendar-ME-Cranberry-Insect-Pests-951x783.jpg 951w\" sizes=\"auto, (max-width: 320px) 85vw, (max-width: 768px) 67vw, (max-width: 1024px) 62vw,992px\" \/><figcaption>Visual Representation for Easy Reference<\/figcaption><\/figure>\n<\/div><\/div>\n\n<\/div><\/div><\/div><\/div>\n\n<\/div><\/div>\n\n<style>.kb-row-layout-id6965_039acc-90 > .kt-row-column-wrap{align-content:start;}:where(.kb-row-layout-id6965_039acc-90 > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}.kb-row-layout-id6965_039acc-90 > .kt-row-column-wrap{column-gap:var(--global-kb-gap-md, 2rem);row-gap:var(--global-kb-gap-md, 2rem);padding-top:var(--global-kb-spacing-xxs, 0.5rem);padding-bottom:var(--global-kb-spacing-xxs, 0.5rem);grid-template-columns:repeat(2, minmax(0, 1fr));}.kb-row-layout-id6965_039acc-90 > .kt-row-layout-overlay{opacity:0.30;}@media all and (max-width: 1024px){.kb-row-layout-id6965_039acc-90 > .kt-row-column-wrap{grid-template-columns:repeat(2, minmax(0, 1fr));}}@media all and (max-width: 767px){.kb-row-layout-id6965_039acc-90 > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr);}}<\/style><div class=\"kb-row-layout-wrap kb-row-layout-id6965_039acc-90 alignwide wp-block-kadence-rowlayout\"><div class=\"kt-row-column-wrap kt-has-2-columns kt-row-layout-equal kt-tab-layout-inherit kt-mobile-layout-row kt-row-valign-top\">\n<style>.kadence-column6965_c26381-ac > .kt-inside-inner-col,.kadence-column6965_c26381-ac > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column6965_c26381-ac > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column6965_c26381-ac > .kt-inside-inner-col{flex-direction:column;}.kadence-column6965_c26381-ac > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column6965_c26381-ac > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column6965_c26381-ac{position:relative;}@media all and (max-width: 1024px){.kadence-column6965_c26381-ac > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column6965_c26381-ac > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column6965_c26381-ac\"><div class=\"kt-inside-inner-col\">\n<h3 class=\"wp-block-heading\">Other species of spanworms\/inchworms:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Expected during:<\/strong> June 1st \u2013 July 31st<\/li>\n\n\n\n<li><strong>Variable or uncertain timing: <\/strong>May 20th \u2013 August 7th<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">False Armyworm:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>False armyworm larvae:<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Expected during: <\/strong>May 25th &#8211; June 25th during the day, and from June 26 &#8211; July 10th feeding mostly at night under the cover of darkness<\/li>\n\n\n\n<li><strong>Variable or uncertain timing:<\/strong> May 20th &#8211; July 15th<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Blossomworm:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Blossomworm larvae:<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Expected during: <\/strong>June 1st &#8211; July 10th<\/li>\n\n\n\n<li><strong>Variable or uncertain timing:<\/strong> May 20th &#8211; July 17th<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Spongy Moth:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Spongy moth larvae:<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Expected during:<\/strong> June 1st &#8211; July 16th during the day, and from July 17th to July 31st feeding mostly at night<\/li>\n\n\n\n<li><strong>Variable or uncertain timing:<\/strong> May 14th &#8211; August 7th<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Cranberry Tipworm:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Cranberry tipworm larvae<\/strong> (multiple generations which quickly begin to overlap):\n<ul class=\"wp-block-list\">\n<li><strong>Expected during: <\/strong>May 22nd &#8211; August 15th<\/li>\n\n\n\n<li><strong>Variable or uncertain timing: <\/strong>May 14th &#8211; end of August (until upright growth shuts down)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Bluntnosed Leafhopper (a known vector of cranberry false blossom disease):<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Expected during: <\/strong>June 15th &#8211; August 25th (a hard frost will finish them off)<\/li>\n\n\n\n<li><strong>Variable or uncertain timing:<\/strong> July 14th &#8211; September 24th<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n<style>.kadence-column6965_356c40-24 > .kt-inside-inner-col,.kadence-column6965_356c40-24 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column6965_356c40-24 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column6965_356c40-24 > .kt-inside-inner-col{flex-direction:column;}.kadence-column6965_356c40-24 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column6965_356c40-24 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column6965_356c40-24{position:relative;}@media all and (max-width: 1024px){.kadence-column6965_356c40-24 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column6965_356c40-24 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column6965_356c40-24\"><div class=\"kt-inside-inner-col\">\n<h3 class=\"wp-block-heading\">Blackheaded Fireworm:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Blackheaded fireworm egg-hatch: <\/strong>variable timing; anytime between approximately May 14th and May 21st<\/li>\n\n\n\n<li><strong>Blackheaded fireworm larvae (1st generation):<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Expected during:<\/strong> May 21st &#8211; July 7th<\/li>\n\n\n\n<li><strong>Variable or uncertain timing:<\/strong> May 14th &#8211; July 15th<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Blackheaded fireworm larvae (2nd generation):<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Expected during: <\/strong>August 10th &#8211; August 20th<\/li>\n\n\n\n<li><strong>Variable or uncertain timing:<\/strong> August 5th &#8211; August 31st<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Blackheaded fireworm larvae (3rd generation): <\/strong>Believed to be possible in warmer years and more and more possible as the overall climate warms.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Cranberry Weevil:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Adult weevils migrate to cranberry beds from about May 14th and continue doing so through as late as roughly June 20th (and feeding on cranberry buds and leaves).<\/li>\n\n\n\n<li>Weevils mate and deposit their eggs into unopened flower pods from about June 20th through the duration of bloom.<\/li>\n\n\n\n<li>Throughout the rest of July and first portion of August, the parent generation of weevils die and their offspring develop, forming a second generation of weevils.<\/li>\n\n\n\n<li>Starting anytime from early to mid-August, the new\/offspring weevils leave cranberry in order to spend the winter in upland areas away from the cranberry beds.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Redheaded Flea Beetle (adults):<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Expected during:<\/strong> August 1st &#8211; September 18th<\/li>\n\n\n\n<li><strong>Variable or uncertain timing:<\/strong> July 14th &#8211; September 24th<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Cranberry Fruitworm:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Expected during:<\/strong>\n<ul class=\"wp-block-list\">\n<li>Eggs begin anywhere from mid-July to almost the end of July<\/li>\n\n\n\n<li>Eggs and larvae both, from end of July to mid-August<\/li>\n\n\n\n<li>Larvae alone (no more eggs) from mid-August to September 24th<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Variable or uncertain timing:<\/strong> Larvae may persist through almost the end of September depending on the season.<\/li>\n<\/ul>\n<\/div><\/div>\n\n<\/div><\/div>\n\n<style>.wp-block-kadence-spacer.kt-block-spacer-6965_c2edf7-19 .kt-block-spacer{height:20px;}.wp-block-kadence-spacer.kt-block-spacer-6965_c2edf7-19 .kt-divider{border-top-width:1px;height:1px;border-top-color:#eee;width:80%;border-top-style:solid;}<\/style>\n<div class=\"wp-block-kadence-spacer alignwide kt-block-spacer-6965_c2edf7-19\"><div class=\"kt-block-spacer kt-block-spacer-halign-center\"><hr class=\"kt-divider\" \/><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>text version equivalent of the image displayed at right: Winter Moth: Other species of spanworms\/inchworms: False Armyworm: Blossomworm: Spongy Moth: Cranberry Tipworm: Bluntnosed Leafhopper (a known vector of cranberry false blossom disease): Blackheaded Fireworm: Cranberry Weevil: Redheaded Flea Beetle (adults): Cranberry Fruitworm:<\/p>\n","protected":false},"author":60,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","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-6965","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>Damaging Stage and Timing of Maine Cranberry Insect Pests (Calendar) - 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\" 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