{"id":12518,"date":"2025-08-15T11:03:42","date_gmt":"2025-08-15T15:03:42","guid":{"rendered":"https:\/\/extension.umaine.edu\/highmoor\/?p=12518"},"modified":"2025-08-15T11:03:42","modified_gmt":"2025-08-15T15:03:42","slug":"sweet-corn-ipm-newsletter-no-7-august-15-2025","status":"publish","type":"post","link":"https:\/\/extension.umaine.edu\/highmoor\/2025\/08\/15\/sweet-corn-ipm-newsletter-no-7-august-15-2025\/","title":{"rendered":"Sweet Corn IPM Newsletter No. 7 — August 15, 2025"},"content":{"rendered":"

FALL ARMYWORM PRESSURE INCREASING<\/h3>\n

Corn Earworm Counts Remain Low-Moderate<\/h4>\n
\"Corn<\/a>
Corn with Drought Stress, photo by David Handley<\/figcaption><\/figure>\n

Situation<\/strong><\/p>\n

It\u2019s official: most of southern and coastal Maine is now under drought conditions, according to the National Weather Service. In addition, there does not appear to be any relief in sight in the near term. Growers are struggling to keep crops irrigated and maintain their water supplies. Many corn fields are under drought stress, which can lead to poor tip fill, reduced ear size, and significant crop loss. Corn earworm and fall armyworm numbers remain low, as there have been no weather fronts from the south to move them into Maine.<\/p>\n

European corn borer<\/strong>: Moth counts were very low again this week, with the exception of our most western site in Oxford, which was over the 5 moth threshold for silking corn. This may be the start of a second generation of this pest, but it will likely vary from site to site.<\/p>\n

Corn earworm<\/strong>: Moth numbers were low again at most locations this week, as the dry weather appears to be slowing the movement of moths into the state. Only four sites are now on a recommended spray schedule for fresh silking corn. A five-day spray interval for silking corn was recommended for Gray; a six-day spray interval was recommended for Dayton, Wayne, and one Wells location.<\/p>\n

Fall armyworm<\/strong>: Moths counts in pheromone traps exceeded the control threshold (3) for silking corn in Biddeford, Cape Elizabeth, Durham, Garland, Gray, Lewiston, and Monmouth this week. Only the Gray site is not presently under a spray interval for earworm, so sprays to protect silking corn were recommended at all others. Armyworm feeding damage on pre-tassel corn was higher at some locations this week. Sprays were recommended at Biddeford, Bowdoinham, and Cape Elizabeth where damage exceeded the control threshold of 15%.<\/p>\n

Western Bean Cutworm<\/strong>: Depending on location, moth counts ranged from 0 to 30 in our pheromone traps this week, suggesting that the peak in the flight of this pest may be ending. Fields presently under a spray interval for corn earworm or fall armyworm should not require additional coverage. A spray for western bean cutworm on silking corn was recommended for Bowdoinham, Farmington and one Wells site.<\/p>\n

\"Fall<\/a>
Fall Armyworm Moths (female right, male left); photo by James Dill<\/figcaption><\/figure>\n

Corn leaf aphids<\/strong>: We want to re-emphasize that aphid infestations on corn have been observed in most fields over the past two weeks. Colonies of these bluish-green insects can cover the tassels, stalks and husks. The waste aphids excrete on the plants stimulates the development of sooty mold, which coats the surface of the husks, and reduces the marketability of the ears. Insecticides that target aphids include Assail\u00ae, Asana\u00ae, Warrior\u00ae and Lannate\u00ae.<\/p>\n

Squash vine borer<\/strong>: No sites exceeded the five moth per week threshold this week.<\/p>\n

 <\/p>\n

 <\/p>\n

Sincerely,<\/p>\n

David T. Handley
\nUMaine Extension Vegetable & Small Fruit Specialist<\/p>\n

Highmoor Farm<\/a>
\nP.O. Box 179
\n52 U.S. Route 202
\nMonmouth, ME 04259
\n207.933.2100<\/p>\n

UMaine Extension Diagnostic Research Lab<\/a>
\nPest Management Unit
\n17 Godfrey Drive
\nOrono, ME 04473
\n1.800.287.0279<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\n

Sweet Corn IPM Weekly Scouting Summary<\/strong><\/h4>\n<\/caption>\n

Location<\/strong><\/th>\nCEW Moths<\/strong><\/th>\nECB Moths<\/strong><\/th>\nFAW Moths<\/strong><\/th>\n%Feeding Damage<\/strong><\/th>\nRecommendations \/ Comments<\/strong><\/th>\n<\/tr>\n
Biddeford<\/td>\n0<\/td>\n0<\/td>\n19<\/td>\n22%<\/td>\nOne spray for FAW on silking corn and pre-tassel corn<\/td>\n<\/tr>\n
Bowdoinham<\/td>\n0<\/td>\n0<\/td>\n1<\/td>\n15%<\/td>\nOne spray for western bean cutworm (see text above)<\/td>\n<\/tr>\n
Cape Elizabeth<\/td>\n0<\/td>\n0<\/td>\n43<\/td>\n31%<\/td>\nOne spray for FAW on silking corn and pre-tassel corn<\/td>\n<\/tr>\n
Dayton<\/td>\n3<\/td>\n0<\/td>\n0<\/td>\n0%<\/td>\n6-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Durham<\/td>\n1<\/td>\n0<\/td>\n7<\/td>\n<\/td>\nOne spray for FAW on silking corn<\/td>\n<\/tr>\n
Farmington<\/td>\n1<\/td>\n0<\/td>\n1<\/td>\n<\/td>\nOne spray for western bean cutworm (see text above)<\/td>\n<\/tr>\n
Garland<\/td>\n0<\/td>\n6<\/td>\n3<\/td>\n<\/td>\nOne spray for ECB and FAW on silking corn<\/td>\n<\/tr>\n
Gray<\/td>\n7<\/td>\n0<\/td>\n21<\/td>\n<\/td>\n5-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Lewiston<\/td>\n0<\/td>\n0<\/td>\n4<\/td>\n<\/td>\nOne spray for FAW on silking corn<\/td>\n<\/tr>\n
Monmouth<\/td>\n0<\/td>\n0<\/td>\n4<\/td>\n<\/td>\nOne spray for FAW on silking corn<\/td>\n<\/tr>\n
Oxford<\/td>\n1<\/td>\n9<\/td>\n<\/td>\n5%<\/td>\nOne spray for ECB on silking corn<\/td>\n<\/tr>\n
Palmyra<\/td>\n0<\/td>\n0<\/td>\n0<\/td>\n<\/td>\nNo spray recommended<\/td>\n<\/tr>\n
Wayne<\/td>\n2<\/td>\n1<\/td>\n1<\/td>\n0%<\/td>\n6-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Wells I<\/td>\n2<\/td>\n0<\/td>\n0<\/td>\n<\/td>\n6-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Wells II<\/td>\n1<\/td>\n0<\/td>\n2<\/td>\n1%<\/td>\nOne spray for western bean cutworm (see text above)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

CEW: Corn earworm (Only fresh silking corn should be sprayed for this insect.)
\nECB: European corn borer
\nFAW: Fall armyworm<\/p>\n

\n\n\n\n\n\n\n\n\n
\n

Corn Earworm Spray Thresholds for Pheromone Traps<\/strong><\/h4>\n<\/caption>\n

Moths caught per week<\/strong><\/th>\nMoths caught per night<\/th>\nSpray Interval<\/th>\n<\/tr>\n
0.0 to 1.4<\/td>\n0.0 to 0.2<\/td>\nNo spray<\/td>\n<\/tr>\n
1.5 to 3.5<\/td>\n0.3 to 0.5<\/td>\nSpray every 6 days<\/td>\n<\/tr>\n
3.6 to 7.0<\/td>\n0.6 to 1.0<\/td>\nSpray every 5 days<\/td>\n<\/tr>\n
7.1 to 91<\/td>\n1.1 to 13.0<\/td>\nSpray every 4 days<\/td>\n<\/tr>\n
More than 91<\/td>\nMore than 13<\/td>\nSpray every 3 days<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Thresholds apply only to corn with exposed fresh silk. Lengthen spray intervals by one day if maximum daily temperature is less than 80\u00b0F.<\/p>\n

European Corn Borer Thresholds<\/h4>\n

Whorl stage: 30% or more of plants scouted show injury.
\nPre-tassel-silk: 15% or more of plants scouted show injury.
\nSilk: 5 or more moths caught in pheromone traps in one week.<\/p>\n

IPM Web Pages:<\/h4>\n

Explore Integrated Pest Management in Maine \u2014 UMaine<\/a><\/p>\n

Integrated Pest Management \u2014 UMass Amherst<\/a><\/p>\n

Pestwatch Report \u2014 PennState<\/a><\/p>\n

Where brand names or company names are used, it is for the reader’s information. No endorsement is implied nor is any discrimination intended against other products with similar ingredients. Always consult product labels for rates, application instructions and safety precautions. Users of these products assume all associated risks.<\/em><\/p>\n

\n

The University of Maine System is an equal opportunity institution committed to nondiscrimination.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

FALL ARMYWORM PRESSURE INCREASING Corn Earworm Counts Remain Low-Moderate Situation It\u2019s official: most of southern and coastal Maine is now under drought conditions, according to the National Weather Service. In addition, there does not appear to be any relief in sight in the near term. Growers are struggling to keep crops irrigated and maintain their […]<\/p>\n","protected":false},"author":201,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","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":""},"categories":[150],"tags":[],"class_list":["post-12518","post","type-post","status-publish","format-standard","hentry","category-sweet-corn-ipm-newsletter"],"yoast_head":"\nSweet Corn IPM Newsletter No. 7 - August 15, 2025 - Cooperative Extension at Highmoor Farm - 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\/highmoor\/2025\/08\/15\/sweet-corn-ipm-newsletter-no-7-august-15-2025\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sweet Corn IPM Newsletter No. 7 - August 15, 2025 - Cooperative Extension at Highmoor Farm - University of Maine Cooperative Extension\" \/>\n<meta property=\"og:description\" content=\"FALL ARMYWORM PRESSURE INCREASING Corn Earworm Counts Remain Low-Moderate Situation It\u2019s official: most of southern and coastal Maine is now under drought conditions, according to the National Weather Service. 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