{"id":1783,"date":"2010-02-25T09:35:32","date_gmt":"2010-02-25T14:35:32","guid":{"rendered":"https:\/\/extension.umaine.edu\/cranberries\/?page_id=1783"},"modified":"2019-02-04T17:48:46","modified_gmt":"2019-02-04T17:48:46","slug":"cranberry-fruitworm","status":"publish","type":"page","link":"https:\/\/extension.umaine.edu\/cranberries\/grower-services\/insects\/cranberry-fruitworm\/","title":{"rendered":"Cranberry Fruitworm"},"content":{"rendered":"<div><strong>Order: <\/strong>Lepidoptera || <strong>Family:<\/strong> Pyralidae<\/div>\n<div><strong>Scientific Name:<\/strong> <em>Acrobasis vaccinii<\/em> (Riley)<\/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: 25%;\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-1783 gallery-columns-4 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\/2010\/02\/CFW-Late-August-2009.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/CFW-Late-August-2009-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Cranberry that has been split open, revealing a Cranberry Fruitworm larva inside (central Maine - late August)\" aria-describedby=\"gallery-1-1791\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/CFW-Late-August-2009-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/CFW-Late-August-2009-32x32.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-1-1791'>\n\t\t\t\tA cranberry that has been split open, revealing a Cranberry fruitworm larva and its droppings\/frass inside\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\/CFW-Late-August-2009-045.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/CFW-Late-August-2009-045-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"photo showing a person&#039;s fingers holding a cranberry that has been cut open in order to reveal a cranberry fruitworm larva inside it (central Maine - Late August)\" aria-describedby=\"gallery-1-1787\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/CFW-Late-August-2009-045-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/CFW-Late-August-2009-045-32x32.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-1-1787'>\n\t\t\t\tAnother view of a cranberry that has been split open, and a Cranberry fruitworm larva and its droppings\/frass\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\/CFW-Late-August-2009-040.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/CFW-Late-August-2009-040-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"photo showing a person&#039;s fingers holding a cranberry that has been cut open in order to reveal a cranberry fruitworm larva inside it (central Maine - Late August)\" aria-describedby=\"gallery-1-1800\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/CFW-Late-August-2009-040-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/CFW-Late-August-2009-040-32x32.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-1-1800'>\n\t\t\t\tCloser view of a cranberry that has been split open, revealing a Cranberry Fruitworm larva and its droppings\/frass inside\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\/CFWberry080603.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/CFWberry080603-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"a picture of a Cranberry Fruitworm larva and the cranberry it was removed from (Maine - early August)\" aria-describedby=\"gallery-1-1793\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/CFWberry080603-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/CFWberry080603-300x297.jpg 300w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/CFWberry080603-105x104.jpg 105w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/CFWberry080603-317x314.jpg 317w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/CFWberry080603-32x32.jpg 32w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/CFWberry080603.jpg 344w\" 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-1-1793'>\n\t\t\t\tA Cranberry fruitworm larva and the cranberry from which it was removed\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\/CFWfrass.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/CFWfrass-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Photo showing a cranberry split open, in two halves, and full of frass left behind by a Cranberry Fruitworm larva\" aria-describedby=\"gallery-1-1799\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/CFWfrass-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/CFWfrass-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-1-1799'>\n\t\t\t\tA cranberry that has been split open, revealing a Cranberry fruitworm larva and its droppings\/frass inside\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\/CFWDamage2001a.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/CFWDamage2001a-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"phtoto showing two cranberries, still on the vine (in the field), destroyed by Cranberry Fruitworm\" aria-describedby=\"gallery-1-1794\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/CFWDamage2001a-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/CFWDamage2001a-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-1-1794'>\n\t\t\t\tTwo cranberries destroyed by Cranberry fruitworm\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\/2CFWlarva00.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/2CFWlarva00-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"picture of a Cranberry Fruitworm larva crawling on the outside of a green cranberry\" aria-describedby=\"gallery-1-1789\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/2CFWlarva00-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/2CFWlarva00-32x32.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-1-1789'>\n\t\t\t\tA Cranberry fruitworm larva crawling on the outside of a green\/unripe cranberry\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\/2016\/08\/Cranberry-Fruitworm-Larva-Aug4-2016.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2016\/08\/Cranberry-Fruitworm-Larva-Aug4-2016-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"A cranberry fruitworm larva inside this cranberry - 08\/04\/2016\" aria-describedby=\"gallery-1-4560\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2016\/08\/Cranberry-Fruitworm-Larva-Aug4-2016-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2016\/08\/Cranberry-Fruitworm-Larva-Aug4-2016-32x32.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-1-4560'>\n\t\t\t\tAn early instar cranberry fruitworm larva inside a cranberry &#8211; 8\/4\/2016\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\/1CFW00.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/1CFW00-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Rather close up picture of a cranberry fruitworm larva (viewed through a dissecting scope)\" aria-describedby=\"gallery-1-1788\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/1CFW00-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/1CFW00-32x32.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-1-1788'>\n\t\t\t\tMagnified view of a cranberry fruitworm larva (viewed through a dissecting scope)\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\/CFW-entrance-and-exit-holes.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/CFW-entrance-and-exit-holes-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"a cranberry with both a visible entrance hole and an exit hole created by a Cranberry Fruitworm larva (entrance hole is the smaller one, covered over with white silk webbing)\" aria-describedby=\"gallery-1-1796\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/CFW-entrance-and-exit-holes-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/CFW-entrance-and-exit-holes-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-1-1796'>\n\t\t\t\tA cranberry with both a visible entrance hole and an exit hole created by a Cranberry fruitworm larva (entrance hole is the smaller one, covered over with white silk webbing to protect the larva inside)\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\/cfw-entrance-hole.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/cfw-entrance-hole-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Photo showing an entrance hole in the side of a green cranberry, and covered over with silken webbing\" aria-describedby=\"gallery-1-1797\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/cfw-entrance-hole-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/cfw-entrance-hole-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-1-1797'>\n\t\t\t\tEntrance hole in the side of a green cranberry, and covered over with silken webbing to protect the larva inside\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\/cfw-entrance-closeup.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/cfw-entrance-closeup-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Closeup view (seen through a dissecting scope) of a cranberry fruitworm&#039;s entrance hole that has been covered over with silken webbing in order to keep out any potential predators\" aria-describedby=\"gallery-1-1798\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/cfw-entrance-closeup-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/cfw-entrance-closeup-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-1-1798'>\n\t\t\t\tCloseup view (seen through a dissecting scope) of a cranberry fruitworm&#8217;s entrance hole that has been covered over with silken webbing in order to keep out any potential predators\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\/CFW-Egg.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/CFW-Egg-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"photo of a cranberry fruitworm egg, nestled securely into the calyx end of the berry\" aria-describedby=\"gallery-1-1792\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/CFW-Egg-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/CFW-Egg-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-1-1792'>\n\t\t\t\tA Cranberry fruitworm egg, nestled securely into the calyx end of its cranberry host\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\/2010\/02\/CFWeggs-parasitized080603.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/CFWeggs-parasitized080603-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Three cranberry fruitworm eggs, and most likely all 3 have been parasitized because they are all dark in color, and because one of them is empty and yet there was no damage done to the berry\" aria-describedby=\"gallery-1-1811\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/CFWeggs-parasitized080603-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/CFWeggs-parasitized080603-32x32.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-1-1811'>\n\t\t\t\tThree cranberry fruitworm eggs, and most likely all 3 have been parasitized because they are all dark in color (and because one of them is empty and yet there was no damage done to the berry)\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\/4CFW00.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/4CFW00-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Close view of the head of a Cranberry Fruitworm larva as it feeds on a cranberry\" aria-describedby=\"gallery-1-1790\" srcset=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/4CFW00-150x150.jpg 150w, https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/4CFW00-32x32.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-1-1790'>\n\t\t\t\tClose view of the head of a Cranberry fruitworm larva as it feeds on a cranberry\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>Life Cycle: <\/strong><\/p>\n<p><strong>Eggs:<\/strong> The Cranberry Fruitworm is a serious cranberry pest that deposits a total of approximately 50 eggs, singly*, in the calyx end&#8211;or blossom end (bottom end)&#8211;of berries while the berries are still green (moths will actively search for berries that are pea-sized or larger to oviposit on, and a bloom stage referred to as <a href=\"https:\/\/extension.umaine.edu\/cranberries\/grower-services\/calculating-out-of-bloom\/\"><strong>50% out-of-bloom<\/strong><\/a> helps with predicting the start of the egg-laying period, and thus the timing of control measures). \u00a0As they near hatch, the eggs develop an\u00a0irregular orange streak. It is nearly impossible to see the eggs without a magnifying lens of some kind. <em>*Rarely does another moth\u00a0deposit an egg on a berry that already has an egg present, but once in awhile you may find a berry with 3 or 4 eggs deposited on it.<\/em><\/p>\n<p><strong>Larvae:<\/strong>\u00a0As obvious from the photos above, the damaging stage of the cranberry fruitworm is the larval stage. Fruitworm larvae are very small and pale yellow-green upon hatching. The larvae begin to\u00a0emerge from the eggs after just three to five days and then most often they will crawl &#8216;up&#8217; from the calyx end to the stem end of the berry (sometimes they tunnel into the calyx end). They then burrow their way into the berry, close the\u00a0entrance hole with silk, and begin feeding on the berry&#8217;s contents with voracious appetite. \u00a0They\u00a0feed from mid-July through September, and during that time, each larva will typically move from one berry to another, hollowing out a total of<strong> three to eight\u00a0berries.<\/strong>\u00a0Berries that have been severely hollowed out will often have an exit hole that is considerably larger than the original entrance hole, as the larva\u00a0increases greatly in size as it feeds, of course, and must thus chew its way out if it expects to locate another berry. The injured berries turn red prematurely, wrinkle and wither, and are commonly\u00a0referred to as &#8216;raisins&#8217;. When mature, the fruitworm larva reaches nearly an inch in length and becomes bright green with a reddish tinge along the dorsal\u00a0(top) portion of its body<span style=\"font-weight: normal\"><span style=\"color: #0000ff\"><span style=\"font-weight: normal\"><span style=\"font-weight: normal\"><strong><span style=\"color: #000000\"><span style=\"font-weight: normal\">.<\/span><\/span><\/strong><\/span><\/span><\/span><\/span><\/p>\n<p><span style=\"font-weight: normal\"><span style=\"color: #0000ff\"><span style=\"font-weight: normal\"><span style=\"font-weight: normal\"><span style=\"color: #000000\"><span style=\"font-weight: normal\"><strong>Adults \/ Moths:<\/strong> Adult moths are active during calm evenings from June through early August.\u00a0During the day they generally stay hidden among the cranberry vines, but at night, there is evidence suggesting that they prefer to move to nearby trees for mating, and then return to the cranberry beds by morning. \u00a0Moths have been known to fly considerable distances in a single flight (270&#8242; to 0.3 miles or more). <strong>Description:<\/strong> The front wings are gray-brown\u00a0with two very small, dark dots near the front margin. There are also two white markings,\u00a0one toward the base of the front wings and the other one around the middle of the front\u00a0margin. The hind wings are also gray-brown.<\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n<hr \/>\n<p><strong>Control [<span style=\"font-weight: normal\"><strong><em><span style=\"font-weight: normal\">Proper management should limit losses to less than 3 percent of the fruit<\/span><\/em>]:<\/strong><\/span><\/strong><\/p>\n<p><strong><span style=\"font-weight: normal\"><strong><span style=\"font-weight: normal\">Control measures are most reliable when timed to a particular bloom stage referred to as\u00a0<\/span><\/strong><\/span><a href=\"https:\/\/extension.umaine.edu\/cranberries\/grower-services\/calculating-out-of-bloom\/\">50% out-of-bloom<\/a><span style=\"font-weight: normal\"><strong><span style=\"font-weight: normal\">. Relatively recent (2009) work in Massachusetts has resulted in some slight revisions to the spray timings they are recommending (at least for growers in that state) surrounding the 50% out-of-bloom stage. \u00a0Wh<strong><span style=\"font-weight: normal\">en 50% out-of-bloom is reached, the conventional practice in the past was to apply a pesticide application 3-5 days later for Stevens, 5-7 days later for Ben Lears, and 7-9 days later for Early Black and Howes. <\/span>The shifted, UMass recommendation now is that for early varieties, <em>especially Stevens<\/em>, the first spray should be timed for the same time as the 50% out-of-bloom date. <span style=\"font-weight: normal\"> However, this is challenging since honey bees and other native bees are still foraging at that time, so pollinator-friendly materials should be given heavy consideration as being a better choice under those circumstances.\u00a0<strong><span style=\"font-weight: normal\"><strong><span style=\"font-weight: normal\"><strong>Intrepid\u00ae and Altacor\u00ae, for example, are two choices for a product that can be applied right at the 50% out-of-bloom stage, for all varieties.<\/strong><\/span><\/strong><\/span><\/strong><\/span><\/strong><\/span><\/strong><\/span><\/strong><\/p>\n<hr \/>\n<p><strong>Additional Treatments?<\/strong> If you are unable to monitor eggs, use the following guidelines:<\/p>\n<ul>\n<li>2nd application 10-11 days after the first;<\/li>\n<li>3rd application may be needed during years of VERY high fruitworm\u00a0populations, 10-11 days after the 2nd application;\u00a0Two sprays seem to be plenty adequate for\u00a0growers in Maine, however, and sometimes only one is needed.<\/li>\n<\/ul>\n<p><strong>Preferably, <span style=\"text-decoration: underline\">monitor eggs<\/span> to trigger sprays<\/strong> (Difficult, however, without significant magnification, preferably a dissecting scope)<strong>:<\/strong><\/p>\n<p>Five days after the first treatment, inspect 50 randomly-picked berries per acre (with a minimum of 200 berries per single, large piece).\u00a0Follow the guidelines in the table below to determine if a spray is warranted. If egg numbers trigger a spray, spray as soon as possible. Otherwise, repeat the berry inspection process every 3-4 days until the egg-laying time has passed (around Aug. 20th). If fruitworm pressure is low through fruit set, it may be safe to extend intervals between berry sampling dates.<\/p>\n<hr \/>\n<p><strong>Table Recommended (for all practices) to Determine Necessity of Additional Spraying for Cranberry Fruitworm:<\/strong><\/p>\n<table border=\"1\" width=\"100%\">\n<thead>\n<tr>\n<th style=\"width: 25%;text-align: center\" scope=\"col\" width=\"25%\"><strong>Number of Acres<\/strong><\/th>\n<th style=\"width: 25%;text-align: center\" scope=\"col\" width=\"25%\"><strong>Number of Berries Checked<\/strong><\/th>\n<th style=\"width: 25%;text-align: center\" scope=\"col\" width=\"25%\">Number of Viable Eggs Needed to Trigger Spray during profitable<br \/>\nberry prices<\/th>\n<th style=\"width: 25%;text-align: center\" scope=\"col\" width=\"25%\">Number of Viable Eggs Needed to Trigger Spray during very low berry prices (&lt; $0.30 per lb.)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align: center\" width=\"25%\">0-5<\/td>\n<td style=\"text-align: center\" width=\"25%\">200-250<\/td>\n<td style=\"text-align: center\" width=\"25%\">1<\/td>\n<td style=\"text-align: center\" width=\"25%\">2<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\" width=\"25%\">6 or 7<\/td>\n<td style=\"text-align: center\" width=\"25%\">251-350<\/td>\n<td style=\"text-align: center\" width=\"25%\">2<\/td>\n<td style=\"text-align: center\" width=\"25%\">4<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\" width=\"25%\">8 or 9<\/td>\n<td style=\"text-align: center\" width=\"25%\">351-450<\/td>\n<td style=\"text-align: center\" width=\"25%\">3<\/td>\n<td style=\"text-align: center\" width=\"25%\">6<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\" width=\"25%\">10 or 11<\/td>\n<td style=\"text-align: center\" width=\"25%\">451-550<\/td>\n<td style=\"text-align: center\" width=\"25%\">4<\/td>\n<td style=\"text-align: center\" width=\"25%\">8<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\" width=\"25%\">for each additional 2 acres<\/td>\n<td style=\"text-align: center\" width=\"25%\">add 100 berries<\/td>\n<td style=\"text-align: center\" width=\"25%\">add 1 egg<\/td>\n<td style=\"text-align: center\" width=\"25%\">double the number determined at left<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<p>The management practice of using a<strong> &#8216;Late-Water Flood&#8217;<\/strong> [<a href=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/05\/LateWater.pdf\">Late-Water Flood (pdf)<\/a> | <a href=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/05\/LateWater.doc\">Late-Water Flood (MS Word)<\/a>] will more than likely greatly reduce\u00a0fruitworm pressure. If you&#8217;ve held Late Water, it is possible that sprays can be eliminated for cranberry fruitworm during the Late-Water year, but berries\u00a0should still\u00a0be monitored for eggs throughout the fruitworm season as the moths are very mobile and may move into your bed from external sources\u2014<em>namely, from stands of wild cranberries.<\/em><\/p>\n<hr \/>\n<p><strong><em>For the most current control recommendations for Maine, please refer to the<\/em> <a href=\"https:\/\/extension.umaine.edu\/cranberries\/grower-services\/cranberry-ipm-guide\/\">Maine Cranberry Pest Management Guide<\/a>.<\/strong><\/p>\n<hr \/>\n","protected":false},"excerpt":{"rendered":"<p>Order: Lepidoptera || Family: Pyralidae Scientific Name: Acrobasis vaccinii (Riley) photos by C. Armstrong Life Cycle: Eggs: The Cranberry Fruitworm is a serious cranberry pest that deposits a total of approximately 50 eggs, singly*, in the calyx end&#8211;or blossom end (bottom end)&#8211;of berries while the berries are still green (moths will actively search for berries [&hellip;]<\/p>\n","protected":false},"author":60,"featured_media":0,"parent":461,"menu_order":3,"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-1783","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>Cranberry Fruitworm - 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\/cranberry-fruitworm\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cranberry Fruitworm - Cooperative Extension: Cranberries - University of Maine Cooperative Extension\" \/>\n<meta property=\"og:description\" content=\"Order: Lepidoptera || Family: Pyralidae Scientific Name: Acrobasis vaccinii (Riley) photos by C. 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Armstrong Life Cycle: Eggs: The Cranberry Fruitworm is a serious cranberry pest that deposits a total of approximately 50 eggs, singly*, in the calyx end&#8211;or blossom end (bottom end)&#8211;of berries while the berries are still green (moths will actively search for berries [&hellip;]","og_url":"https:\/\/extension.umaine.edu\/cranberries\/grower-services\/insects\/cranberry-fruitworm\/","og_site_name":"Cooperative Extension: Cranberries","article_modified_time":"2019-02-04T17:48:46+00:00","og_image":[{"url":"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/02\/CFW-Late-August-2009-150x150.jpg","type":"","width":"","height":""}],"twitter_card":"summary_large_image","twitter_misc":{"Est. reading time":"5 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/extension.umaine.edu\/cranberries\/grower-services\/insects\/cranberry-fruitworm\/","url":"https:\/\/extension.umaine.edu\/cranberries\/grower-services\/insects\/cranberry-fruitworm\/","name":"Cranberry Fruitworm - Cooperative Extension: Cranberries - University of Maine Cooperative Extension","isPartOf":{"@id":"https:\/\/extension.umaine.edu\/cranberries\/#website"},"datePublished":"2010-02-25T14:35:32+00:00","dateModified":"2019-02-04T17:48:46+00:00","breadcrumb":{"@id":"https:\/\/extension.umaine.edu\/cranberries\/grower-services\/insects\/cranberry-fruitworm\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/extension.umaine.edu\/cranberries\/grower-services\/insects\/cranberry-fruitworm\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/extension.umaine.edu\/cranberries\/grower-services\/insects\/cranberry-fruitworm\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/extension.umaine.edu\/cranberries\/"},{"@type":"ListItem","position":2,"name":"Grower Services","item":"https:\/\/extension.umaine.edu\/cranberries\/grower-services\/"},{"@type":"ListItem","position":3,"name":"Insects Associated with Maine Cranberries:","item":"https:\/\/extension.umaine.edu\/cranberries\/grower-services\/insects\/"},{"@type":"ListItem","position":4,"name":"Cranberry Fruitworm"}]},{"@type":"WebSite","@id":"https:\/\/extension.umaine.edu\/cranberries\/#website","url":"https:\/\/extension.umaine.edu\/cranberries\/","name":"Cooperative Extension: Cranberries","description":"Information you can use. 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