{"id":1859,"date":"2010-02-25T13:56:22","date_gmt":"2010-02-25T18:56:22","guid":{"rendered":"https:\/\/extension.umaine.edu\/cranberries\/?page_id=1859"},"modified":"2025-11-06T21:35:30","modified_gmt":"2025-11-06T21:35:30","slug":"blackheaded-fireworm","status":"publish","type":"page","link":"https:\/\/extension.umaine.edu\/cranberries\/grower-services\/insects\/blackheaded-fireworm\/","title":{"rendered":"Blackheaded Fireworm"},"content":{"rendered":"<div><strong>Order:<\/strong> Lepidoptera ||<strong> Family:<\/strong> Tortricidae<\/div>\n<div><strong>Scientific Name: <\/strong><em>Rhopobota naevana<\/em> (H\u00fcbner)<\/div>\n<hr \/>\n\n\t\t<style type=\"text\/css\">\n\t\t\t#gallery-1 {\n\t\t\t\tmargin: auto;\n\t\t\t}\n\t\t\t#gallery-1 .gallery-item {\n\t\t\t\tfloat: left;\n\t\t\t\tmargin-top: 10px;\n\t\t\t\ttext-align: center;\n\t\t\t\twidth: 20%;\n\t\t\t}\n\t\t\t#gallery-1 img {\n\t\t\t\tborder: 2px solid #cfcfcf;\n\t\t\t}\n\t\t\t#gallery-1 .gallery-caption {\n\t\t\t\tmargin-left: 0;\n\t\t\t}\n\t\t\t\/* see gallery_shortcode() in wp-includes\/media.php *\/\n\t\t<\/style>\n\t\t<div id='gallery-1' class='gallery galleryid-1859 gallery-columns-5 gallery-size-thumbnail'><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2019\/08\/BHFireworm-Eggs-Aug2019.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2019\/08\/BHFireworm-Eggs-Aug2019-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Blackheaded fireworm eggs deposited singly on some cranberry leaves (21 eggs in total)\" aria-describedby=\"gallery-1-6422\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2019\/08\/BHFireworm-Eggs-Aug2019-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2019\/08\/BHFireworm-Eggs-Aug2019-32x32.jpg 32w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-6422'>\n\t\t\t\tBlackheaded fireworm eggs on cranberry leaves (ordinarily any leaves on uprights growing on a bog with a fireworm infestation would typically have no more than just one or two eggs per &#8216;chosen&#8217; leaf, but the moths that deposited these eggs were held in captivity with very few leaves at their disposal)\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2019\/08\/3rd-generation-Fireworm-Egg-081519b.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2019\/08\/3rd-generation-Fireworm-Egg-081519b-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"A blackheaded fireworm egg on the underside of a cranberry leaf\" aria-describedby=\"gallery-1-6425\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2019\/08\/3rd-generation-Fireworm-Egg-081519b-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2019\/08\/3rd-generation-Fireworm-Egg-081519b-32x32.jpg 32w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-6425'>\n\t\t\t\tBlackheaded fireworm egg on the underside of a cranberry leaf\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2019\/08\/3rd-generation-Fireworm-Egg-081519c.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2019\/08\/3rd-generation-Fireworm-Egg-081519c-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"A blackheaded fireworm egg on the underside of a cranberry leaf\" aria-describedby=\"gallery-1-6423\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2019\/08\/3rd-generation-Fireworm-Egg-081519c-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2019\/08\/3rd-generation-Fireworm-Egg-081519c-32x32.jpg 32w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-6423'>\n\t\t\t\tCloser view of the Blackheaded fireworm egg shown in the adjacent (left) photo\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2019\/08\/3rd-gen-Fireworm-Eggs-081619.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2019\/08\/3rd-gen-Fireworm-Eggs-081619-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"A pair of blackheaded fireworm eggs on the underside of a cranberry leaf\" aria-describedby=\"gallery-1-6424\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2019\/08\/3rd-gen-Fireworm-Eggs-081619-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2019\/08\/3rd-gen-Fireworm-Eggs-081619-32x32.jpg 32w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-6424'>\n\t\t\t\tA pair of Blackheaded fireworm eggs on the underside of a cranberry leaf\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-EmptyEggShells-082004a.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-EmptyEggShells-082004a-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"photo showing 3 empty eggs (blackheaded fireworm eggs that have previously hatched)\" aria-describedby=\"gallery-1-1879\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-EmptyEggShells-082004a-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-EmptyEggShells-082004a-32x32.jpg 32w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-1879'>\n\t\t\t\tThree hatched\/empty blackheaded fireworm eggs\n\t\t\t\t<\/dd><\/dl><br style=\"clear: both\" \/><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2016\/07\/HatchedFirewormEggs-072016.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2016\/07\/HatchedFirewormEggs-072016-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Photo of the underside of a cranberry leaf, with 11 hatched eggs of blackheaded fireworm larvae.\" aria-describedby=\"gallery-1-4556\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2016\/07\/HatchedFirewormEggs-072016-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2016\/07\/HatchedFirewormEggs-072016-32x32.jpg 32w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-4556'>\n\t\t\t\tEmpty Blackheaded fireworm eggs on the underside of a cranberry leaf (7\/20\/16); the moth that deposited the eggs was in captivity with only a few cranberry stems at her disposal.\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BFW-larva-061808.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BFW-larva-061808-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"A full-sized Blackheaded Fireworm larva next to some cranberry leaves for scale purposes.\" aria-describedby=\"gallery-1-1865\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BFW-larva-061808-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BFW-larva-061808-32x32.jpg 32w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-1865'>\n\t\t\t\tBlackheaded fireworm larva (full-sized; final instar)\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-052707.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-052707-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"A Blackheaded Fireworm larva crawling on the edge of a single cranberry leaf (larvae are pale yellow\/green with a shiny black head)\" aria-describedby=\"gallery-1-1864\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-052707-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-052707-32x32.jpg 32w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-1864'>\n\t\t\t\tBlackheaded fireworm larva\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon portrait'>\n\t\t\t\t<a href='https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2019\/06\/Blackheaded-Fireworm-Larva-061719a.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2019\/06\/Blackheaded-Fireworm-Larva-061719a-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"A 1st-generation blackheaded fireworm larva - June 17th, 2019\" aria-describedby=\"gallery-1-6338\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2019\/06\/Blackheaded-Fireworm-Larva-061719a-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2019\/06\/Blackheaded-Fireworm-Larva-061719a-32x32.jpg 32w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-6338'>\n\t\t\t\tA 1st-generation blackheaded fireworm larva, downeast Maine &#8211; June 17th, 2019.  Look for the shiny black head to help with identification.\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/firewormdamage-2000b.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/firewormdamage-2000b-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"photo showing several cranberry leaves damaged by Blackheaded Fireworm larvae (larvae feed by skeletonizing the leaves)\" aria-describedby=\"gallery-1-1880\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/firewormdamage-2000b-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/firewormdamage-2000b-32x32.jpg 32w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-1880'>\n\t\t\t\tCranberry leaves damaged by Blackheaded fireworm larvae (they feed by skeletonizing the leaves)\n\t\t\t\t<\/dd><\/dl><br style=\"clear: both\" \/><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/052707.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/052707-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Photo of a damaged cranberry leaf (damaged by Blackheaded Fireworm) next to a healthy, undamaged leaf\" aria-describedby=\"gallery-1-1870\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/052707-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/052707-32x32.jpg 32w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-1870'>\n\t\t\t\tA fireworm-damaged cranberry leaf (left) next to an undamaged cranberry leaf (right)\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-damage-leaf-mining.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-damage-leaf-mining-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"2nd photo showing two cranberry leaves damaged by Blackheaded Fireworm larvae (larvae feed by skeletonizing the leaves)\" aria-describedby=\"gallery-1-1873\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-damage-leaf-mining-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-damage-leaf-mining-32x32.jpg 32w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-1873'>\n\t\t\t\tTwo cranberry leaves with feeding injury from Blackheaded fireworm larvae\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-tip-062207b.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-tip-062207b-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"photo showing a cranberry tip occupied by a Blackheaded Fireworm larva (photographed June 22nd in central Maine)\" aria-describedby=\"gallery-1-1878\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-tip-062207b-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-tip-062207b-32x32.jpg 32w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-1878'>\n\t\t\t\tA cranberry tip occupied by a Blackheaded fireworm larva (in Maine, be watchful for this in June each year)\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-062207-uprights-webbed-together.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-062207-uprights-webbed-together-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Cranberry tips pulled together and occupied by a Blackheaded Fireworm larva (photographed June 22nd in central Maine)\" aria-describedby=\"gallery-1-1872\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-062207-uprights-webbed-together-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-062207-uprights-webbed-together-32x32.jpg 32w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-1872'>\n\t\t\t\tCranberry tips pulled\/webbed together and occupied by a Blackheaded fireworm larva\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-062207-tips-pulled-together-frass-visible.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-062207-tips-pulled-together-frass-visible-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"photo showing another example of 3 or 4 cranberry tips pulled and webbed together by a Blackheaded Fireworm larva (some frass is also visible in this picture)\" aria-describedby=\"gallery-1-1871\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-062207-tips-pulled-together-frass-visible-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-062207-tips-pulled-together-frass-visible-32x32.jpg 32w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-1871'>\n\t\t\t\tAnother example of some cranberry tips pulled and webbed together by a Blackheaded fireworm larva (some frass is also visible in this picture: little black droppings that are visible on the lower leaves)\n\t\t\t\t<\/dd><\/dl><br style=\"clear: both\" \/><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-tip-062207.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-tip-062207-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Another cranberry tip damaged by a Blackheaded fireworm larva hidden between the leaves\" aria-describedby=\"gallery-1-1877\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-tip-062207-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-tip-062207-32x32.jpg 32w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-1877'>\n\t\t\t\tAnother cranberry tip damaged by a Blackheaded fireworm larva hidden between the leaves\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-damage-082004.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-damage-082004-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"photo of a cranberry bed with a noticeable dark area that is an area that was ravaged by Blackheaded Fireworm larvae (2nd-generation larvae) (photographed August 20th - downeast Maine)\" aria-describedby=\"gallery-1-1888\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-damage-082004-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-damage-082004-32x32.jpg 32w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-1888'>\n\t\t\t\tA cranberry bed with a noticeable dark area that was ravaged by Blackheaded fireworm larvae (2nd-generation larvae) (photographed August 20th &#8211; downeast Maine) (be watchful in July and August for the 2nd generation of larvae)\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-pupae-062107.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-pupae-062107-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"photo showing a pair of Blackheaded Fireworm pupae (photographed June 21st central Maine)\" aria-describedby=\"gallery-1-1876\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-pupae-062107-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-pupae-062107-32x32.jpg 32w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-1876'>\n\t\t\t\tA pair of Blackheaded fireworm pupae (photographed June 21st in central Maine)\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon portrait'>\n\t\t\t\t<a href='https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2025\/11\/Hatched-Blackheaded-Fireworm-Pupa-2025bPS.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2025\/11\/Hatched-Blackheaded-Fireworm-Pupa-2025bPS-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"An empty blackheaded fireworm pupa after the moth has broken out of it, next to a US penny for size perspective (2nd-generation; August 2025)\" aria-describedby=\"gallery-1-7313\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2025\/11\/Hatched-Blackheaded-Fireworm-Pupa-2025bPS-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2025\/11\/Hatched-Blackheaded-Fireworm-Pupa-2025bPS-105x106.jpg 105w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2025\/11\/Hatched-Blackheaded-Fireworm-Pupa-2025bPS-317x320.jpg 317w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2025\/11\/Hatched-Blackheaded-Fireworm-Pupa-2025bPS-423x427.jpg 423w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2025\/11\/Hatched-Blackheaded-Fireworm-Pupa-2025bPS-300x300.jpg 300w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2025\/11\/Hatched-Blackheaded-Fireworm-Pupa-2025bPS-400x400.jpg 400w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2025\/11\/Hatched-Blackheaded-Fireworm-Pupa-2025bPS-600x600.jpg 600w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2025\/11\/Hatched-Blackheaded-Fireworm-Pupa-2025bPS-32x32.jpg 32w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-7313'>\n\t\t\t\tAn empty Blackheaded fireworm pupa after the moth has broken out of it (2nd-generation; August 2025)\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-moth.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-moth-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"A Blackheaded Fireworm moth resting in the palm of a person&#039;s hand\" aria-describedby=\"gallery-1-1875\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-moth-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-moth-32x32.jpg 32w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-1875'>\n\t\t\t\tBlackheaded fireworm adult\/moth (they are quite small)\n\t\t\t\t<\/dd><\/dl><br style=\"clear: both\" \/><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-moth-062207.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-moth-062207-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Photo of a single Blackheaded Fireworm moth (picture taken June 22nd - central Maine)\" aria-describedby=\"gallery-1-1874\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-moth-062207-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/BHFW-moth-062207-32x32.jpg 32w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-1874'>\n\t\t\t\tA Blackheaded fireworm moth (picture taken June 22nd &#8211; central Maine)\n\t\t\t\t<\/dd><\/dl>\n\t\t\t<br style='clear: both' \/>\n\t\t<\/div>\n\n<p><em> photos by C. Armstrong<\/em><\/p>\n<hr \/>\n<p><strong>Description:<\/strong><\/p>\n<p><strong>Adults \/ Moths:<\/strong> The adults are very small, only about 1\/4-inch in length, dark in color, with alternating light and dark gray-brown bands on their forewings. They are active at dusk, and can be seen hovering freely just above the vines. They will occasionally fly during the day if it is cloudy and warm or if they are disturbed. Female moths begin laying eggs within a day of emergence from their pupae. Typically by mid to late July (in Maine), a second generation of caterpillars begins, and this leads to a 2nd-generation of moths that emerge and then lay a new generation of eggs <em>(in some years, a third generation of larvae may thus be possible, but generally the second generation of eggs are the ones that subsequently overwinter before hatching into 1st-generation larvae the following May or early June).<\/em><\/p>\n<p><strong>Eggs: <\/strong>Eggs that are oviposited by the final generation of moths overwinter and begin to hatch in May (average over the years puts the first hatching at around May 24th for most of Maine). \u00a0The hatching period may continue for three to six weeks, varying some according to temperature (colder weather will extend the period). Eggs laid by the ensuing moths begin to hatch usually in mid-July (sometimes end of June in warmer summers or in warmer locations like southern Maine and Massachusetts). Each egg is laid singly on the underside of the cranberry leaves and has a flat, disklike shape. They are extremely small (1\/32-inch in diameter) and yellow in color, unless they have already emerged as in the case of the three empty eggshells pictured above which are white.<\/p>\n<p><span style=\"font-weight: normal\"><strong>Larvae: <\/strong><\/span>(mid to late May until mid to late-June, and again starting generally in mid to late July when a 2nd-generation begins) &#8212; The damaging stage of the blackheaded fireworm is the larval stage. Larvae are green-yellow or pale yellow, and their heads are black and shiny (see photos above). When mature (two to three weeks after hatching), they measure roughly 1\/3-inch in length.\u00a0<strong><em>There are two separate generations of larvae (maybe even three) each season, and the 2nd generation is the more damaging one since their numbers are normally much greater<\/em><\/strong><em> (each mated female moth can lay upwards of 200 eggs).<\/em><strong><em>\u00a0 Cranberry leaves that are consumed by fireworm results in fewer nutrients available for nourishing and growing the berries.<\/em><\/strong><\/p>\n<hr \/>\n<p><span style=\"font-weight: normal\"><strong>Monitoring and Control:\u00a0<\/strong><\/span>In addition to sweep-net scouting, spend some time visually scanning for upright tips with terminal leaves that have been webbed tightly together!\u00a0 Break off any tip of that sort, and carefully tease apart the terminal leaves.\u00a0 If a small larva suddenly squirms out, wriggling backwards and possibly right across your hand and down to the ground (often attached to a strand of silk)&#8230;and if this happens before you&#8217;ve even blinked, then you&#8217;ve probably encountered a fireworm larva. You should then sweep, if you haven&#8217;t already, to see if you pick up any in your net.\u00a0\u00a0<span style=\"font-weight: normal\"><strong>They do not get picked up in sweeps very easily, so if you average even <span style=\"text-decoration: underline\">one<\/span> larva per 25 sweeps, you may well be justified in taking action (depending on your history with this pest, your expected crop value, etc.).<\/strong> <\/span>View the\u00a0<strong><a href=\"https:\/\/extension.umaine.edu\/cranberries\/site-map\/cranberry-ipm-guide\/\">Maine Cranberry Pest Management Guide<\/a> <\/strong>for a list of the currently available pesticide products for controlling them, and for the most current recommended Action Threshold (AT) to consider following for triggering a spray or possibly a larval-drowning flood (the traditional AT is just 1 to 2 larvae per 25 sweeps).\u00a0 Infestations of 2nd-generation larvae are far more dangerous, because their numbers are much higher, especially, of course, if any 1st-generation populations are left uncontrolled.\u00a0 Infestations of both generations are usually\u00a0<strong>patchy<\/strong>,\u00a0at least at first, and larvae tend to be more numerous along edges. Spot-treatment is desirable in such cases.<span style=\"font-weight: normal\"><strong> Sweepnet-captured &#8216;First Dates&#8217; for 1st-generation larvae<\/strong><\/span><span style=\"font-weight: normal\"><strong>: 6\/12\/06, 5\/25\/07, 5\/14\/08, 5\/14\/09, 5\/16\/13, 5\/20\/14, 5\/27\/17, 5\/21\/18, 6\/5\/19 <em>(Average of these = May 24th); <\/em><\/strong><\/span><span style=\"font-weight: normal\"><strong><em>See also <\/em><\/strong>the <a href=\"https:\/\/extension.umaine.edu\/cranberries\/grower-services\/pest-reports\/\"><strong>Pest Report<\/strong><\/a> each year for news of Maine&#8217;s first detection of 1st-generation fireworm larvae.<\/span><\/p>\n<hr \/>\n","protected":false},"excerpt":{"rendered":"<p>Order: Lepidoptera || Family: Tortricidae Scientific Name: Rhopobota naevana (H\u00fcbner) photos by C. Armstrong Description: Adults \/ Moths: The adults are very small, only about 1\/4-inch in length, dark in color, with alternating light and dark gray-brown bands on their forewings. They are active at dusk, and can be seen hovering freely just above the [&hellip;]<\/p>\n","protected":false},"author":60,"featured_media":0,"parent":461,"menu_order":5,"comment_status":"closed","ping_status":"closed","template":"templates\/page-withsidebar.php","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-1859","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>Blackheaded Fireworm - 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\" href=\"https:\/\/extension.umaine.edu\/cranberries\/grower-services\/insects\/blackheaded-fireworm\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Blackheaded Fireworm - Cooperative Extension: Cranberries - University of Maine Cooperative Extension\" \/>\n<meta property=\"og:description\" content=\"Order: Lepidoptera || Family: Tortricidae Scientific Name: Rhopobota naevana (H\u00fcbner) photos by C. Armstrong Description: Adults \/ Moths: The adults are very small, only about 1\/4-inch in length, dark in color, with alternating light and dark gray-brown bands on their forewings. 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