{"id":680,"date":"2012-04-02T11:03:36","date_gmt":"2012-04-02T15:03:36","guid":{"rendered":"https:\/\/extension.umaine.edu\/potatoes\/?page_id=680"},"modified":"2019-04-25T13:49:40","modified_gmt":"2019-04-25T17:49:40","slug":"european-corn-borer","status":"publish","type":"page","link":"https:\/\/extension.umaine.edu\/potatoes\/ipm\/field-guide\/european-corn-borer\/","title":{"rendered":"European Corn Borer"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-full wp-image-686\" src=\"http:\/\/extension.umaine.edu\/potatoes\/wp-content\/uploads\/sites\/49\/2012\/04\/ecb1.jpg\" alt=\"European Corn Borer egg mass\" width=\"215\" height=\"200\" srcset=\"https:\/\/extension.umaine.edu\/potatoes\/wp-content\/uploads\/sites\/49\/2012\/04\/ecb1.jpg 215w, https:\/\/extension.umaine.edu\/potatoes\/wp-content\/uploads\/sites\/49\/2012\/04\/ecb1-105x98.jpg 105w\" sizes=\"auto, (max-width: 320px) 85vw, (max-width: 768px) 67vw, (max-width: 1024px) 62vw,215px\" \/>European corn borer egg masses will appear as a small white area of overlapping scales. These egg masses will be on the underside of leaflets and on stalks<\/p>\n<p>The economic threshold for European corn borer egg masses: Average of 1 egg mass per 15 plants.<\/p>\n<h3>European Corn Borer Egg Masses<\/h3>\n<p>European corn borer egg masses will hatch in 3 to 7 days depending upon the weather. The warmer the weather, the more rapidly the eggs will hatch. The cooler the weather, the longer that it will take for the eggs to hatch.<\/p>\n<p>When black dots can be seen in the egg mass, the egg mass is very near hatching.<\/p>\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: 50%;\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-680 gallery-columns-2 gallery-size-medium'><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"216\" height=\"200\" src=\"https:\/\/extension.umaine.edu\/potatoes\/wp-content\/uploads\/sites\/49\/2012\/04\/ecb2.jpg\" class=\"attachment-medium size-medium\" alt=\"European Corn Borer egg masses\" srcset=\"https:\/\/extension.umaine.edu\/potatoes\/wp-content\/uploads\/sites\/49\/2012\/04\/ecb2.jpg 216w, https:\/\/extension.umaine.edu\/potatoes\/wp-content\/uploads\/sites\/49\/2012\/04\/ecb2-105x97.jpg 105w\" sizes=\"auto, (max-width: 320px) 85vw, (max-width: 768px) 67vw, (max-width: 1024px) 62vw,216px\" \/>\n\t\t\t<\/dt><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"207\" height=\"200\" src=\"https:\/\/extension.umaine.edu\/potatoes\/wp-content\/uploads\/sites\/49\/2012\/04\/ecb3.jpg\" class=\"attachment-medium size-medium\" alt=\"European Corn Borer egg masses\" srcset=\"https:\/\/extension.umaine.edu\/potatoes\/wp-content\/uploads\/sites\/49\/2012\/04\/ecb3.jpg 207w, https:\/\/extension.umaine.edu\/potatoes\/wp-content\/uploads\/sites\/49\/2012\/04\/ecb3-105x101.jpg 105w, https:\/\/extension.umaine.edu\/potatoes\/wp-content\/uploads\/sites\/49\/2012\/04\/ecb3-32x32.jpg 32w\" sizes=\"auto, (max-width: 320px) 85vw, (max-width: 768px) 67vw, (max-width: 1024px) 62vw,207px\" \/>\n\t\t\t<\/dt><\/dl><br style=\"clear: both\" \/>\n\t\t<\/div>\n\n<h3><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-691 alignright\" src=\"http:\/\/extension.umaine.edu\/potatoes\/wp-content\/uploads\/sites\/49\/2012\/04\/ecb4.jpg\" alt=\"European Corn Borer Entry Site\" width=\"279\" height=\"200\" srcset=\"https:\/\/extension.umaine.edu\/potatoes\/wp-content\/uploads\/sites\/49\/2012\/04\/ecb4.jpg 279w, https:\/\/extension.umaine.edu\/potatoes\/wp-content\/uploads\/sites\/49\/2012\/04\/ecb4-105x75.jpg 105w\" sizes=\"auto, (max-width: 320px) 85vw, (max-width: 768px) 67vw, (max-width: 1024px) 62vw,279px\" \/>European Corn Borer Entry Site<\/h3>\n<p>The entry site of a European corn borer larva into the potato stalk will be a small hole usually surrounded by frass. The frass is a sawdust-like material, which is waste from the insect.<\/p>\n<h3>European Corn Borer Larvae<\/h3>\n<p>European corn borer larvae can be found within the stalk. Once larvae are within the stalk, they are protected from intervention. Larvae will over-winter within the stalk.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-692 alignnone\" src=\"http:\/\/extension.umaine.edu\/potatoes\/wp-content\/uploads\/sites\/49\/2012\/04\/ecb5.jpg\" alt=\"European Corn Borer Larvae\" width=\"218\" height=\"200\" srcset=\"https:\/\/extension.umaine.edu\/potatoes\/wp-content\/uploads\/sites\/49\/2012\/04\/ecb5.jpg 218w, https:\/\/extension.umaine.edu\/potatoes\/wp-content\/uploads\/sites\/49\/2012\/04\/ecb5-105x96.jpg 105w\" sizes=\"auto, (max-width: 320px) 85vw, (max-width: 768px) 67vw, (max-width: 1024px) 62vw,218px\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>European corn borer egg masses will appear as a small white area of overlapping scales. These egg masses will be on the underside of leaflets and on stalks The economic threshold for European corn borer egg masses: Average of 1 egg mass per 15 plants. European Corn Borer Egg Masses European corn borer egg masses [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"parent":662,"menu_order":7,"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-680","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>European Corn Borer - Cooperative Extension: Potatoes - 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\/potatoes\/ipm\/field-guide\/european-corn-borer\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"European Corn Borer - Cooperative Extension: Potatoes - University of Maine Cooperative Extension\" \/>\n<meta property=\"og:description\" content=\"European corn borer egg masses will appear as a small white area of overlapping scales. 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