{"id":13547,"date":"2026-08-21T08:44:16","date_gmt":"2026-08-21T12:44:16","guid":{"rendered":"https:\/\/extension.umaine.edu\/highmoor\/?p=13547"},"modified":"2026-08-21T08:44:16","modified_gmt":"2026-08-21T12:44:16","slug":"sweet-corn-ipm-newsletter-no-9-august-21-2026","status":"publish","type":"post","link":"https:\/\/extension.umaine.edu\/highmoor\/2026\/08\/21\/sweet-corn-ipm-newsletter-no-9-august-21-2026\/","title":{"rendered":"Sweet Corn IPM Newsletter No. 9 — August 21, 2026"},"content":{"rendered":"

Fall Armyworm Threatens Late Corn<\/h3>\n

Corn Earworm Numbers Lower, Silking Corn Requires Protection<\/h4>\n

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

\"Corn
Corn with Drought Stress, photo by David Handley<\/figcaption><\/figure>\n

Most parts of the state are still very dry and irrigation sources are being strained on many farms. Heat and drought have caused some pollination and fill problems with corn ears, especially in unirrigated fields, but later planted corn is mostly looking good. Corn earworm counts were down this week, but still at threatening levels in most sites. Fall armyworm counts were higher at nearly all locations.<\/p>\n

European corn borer<\/strong>: Moth counts were low again this week. No sites were over the threshold of five moths in the presence of silking corn. Larval feeding damage in pre-tassel corn was also low. No sprays for corn borer were recommended for corn that is not yet silking.<\/p>\n

Corn earworm<\/strong>: Moth counts were lower at nearly all locations this week, although all but two sites are still on a spray interval for silking corn. A 6-day spray interval for silking corn was recommended in Palmyra; A 5-day spray interval was recommended for Bowdoinham, Corinth and Monmouth. A 4-day spray interval was recommended for Biddeford, Cape Elizabeth, Dayton, Durham, Gray, Lewiston, Oxford and Wells. The Farmington and Wayne sites were not over threshold this week.<\/p>\n

Fall armyworm<\/strong>: Moth numbers were much higher in pheromone traps at nearly all sites this week, exceeding the threshold of three per week in silking corn at all sites except Palmyra. Two of these locations, Farmington and Wayne, were not presently on a spray interval for corn earworm, so a spray to protect silking corn was recommended. Fall armyworm larval feeding damage in pre-tassel corn was higher at some locations and exceeded the threshold of 12% (for daytime temperatures over 80\u00b0) at Cape Elizabeth and Oxford.<\/p>\n

Western Bean Cutworm<\/strong>: Moth and egg mass counts were variable this week but continue to decline overall. Gray, Lewiston and Oxford had potentially damaging populations, and a protective silk spray would be recommended if these fields were not presently on a spray program for corn earworm.<\/p>\n

Squash vine borer<\/strong>: Moth numbers in pheromone traps continue to be low this week. No sites exceeded the 5-moth threshold.<\/p>\n

Aphids<\/strong>: Aphid infestations on tassels and silks continue to be an issue in most fields. Registered insecticides include Assail\u00ae, Asana\u00ae, Warrior\u00ae and Lannate\u00ae.<\/p>\n

When Should I Stop Spraying<\/strong>: When a silking corn field is under a spray interval for corn earworm, spraying should stop once the silks are thoroughly dried and brown. At this stage, corn earworm moths are unlikely to lay eggs on it. However, if earworm pressure is very high (e.g. 91+ moths per week) and\/or fall armyworm moths are over threshold (3 or more moths per week), then spraying should continue until either the moth counts drop, or the required number of days before harvest (dh) for the product being used is reached.<\/p>\n

Deep Compost School at Sound Pine Farm:<\/h4>\n

Join the University of Maine Cooperative Extension and Sound Pine Farm on August 25 for a field day about deep compost mulch soil management for vegetables. Participants will hear about our project, tour Sound Pine Farm\u2019s deep compost mulch fields, and take part in a discussion with fellow farmers and Extension staff. This field day is free to attend, though registration is required<\/strong>. Visit the Deep Compost Mulch Field Day at Sound Pine Farm’s event page<\/a> for registration and agenda.<\/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>\nWBCW Moths<\/strong><\/th>\n% Feeding Damage<\/strong><\/th>\nRecommendations \/ Comments<\/strong><\/th>\n<\/tr>\n
Biddeford<\/td>\n14<\/td>\n1<\/td>\n59<\/td>\n0<\/td>\n11%<\/td>\n4-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Bowdoinham<\/td>\n7<\/td>\n0<\/td>\n40<\/td>\n2<\/td>\n–<\/td>\n5-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Cape Elizabeth<\/td>\n55<\/td>\n3<\/td>\n69<\/td>\n0<\/td>\n17%<\/td>\n4-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Corinth<\/td>\n7<\/td>\n0<\/td>\n15<\/td>\n–<\/td>\n1%<\/td>\n5-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Dayton<\/td>\n20<\/td>\n4<\/td>\n4<\/td>\n1<\/td>\n8%<\/td>\n4-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Durham<\/td>\n12<\/td>\n0<\/td>\n45<\/td>\n0<\/td>\n–<\/td>\n4-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Farmington<\/td>\n1<\/td>\n0<\/td>\n7<\/td>\n1<\/td>\n–<\/td>\nOne time spray on silking corn for FAW<\/td>\n<\/tr>\n
Gray<\/td>\n62<\/td>\n0<\/td>\n65<\/td>\n6<\/td>\n–<\/td>\n4-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Lewiston<\/td>\n45<\/td>\n1<\/td>\n56<\/td>\n4<\/td>\n–<\/td>\n4-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Monmouth<\/td>\n7<\/td>\n0<\/td>\n24<\/td>\n1<\/td>\n–<\/td>\n5-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Oxford<\/td>\n11<\/td>\n1<\/td>\n6<\/td>\n4<\/td>\n13%<\/td>\n4-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Palmyra<\/td>\n3<\/td>\n1<\/td>\n0<\/td>\n–<\/td>\n1%<\/td>\n6-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Wayne<\/td>\n1<\/td>\n0<\/td>\n9<\/td>\n2<\/td>\n–<\/td>\nOne time spray on silking corn for FAW<\/td>\n<\/tr>\n
Wells<\/td>\n23<\/td>\n0<\/td>\n8<\/td>\n0<\/td>\n–<\/td>\n4-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Wells II<\/td>\n33<\/td>\n1<\/td>\n14<\/td>\n0<\/td>\n–<\/td>\n4-day spray interval recommended for silking corn<\/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

\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.<\/p>\n

University of Maine Cooperative Extension is an equal opportunity institution and provider committed to nondiscrimination. For more information, visit extension.umaine.edu\/nondiscrimination<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

Fall Armyworm Threatens Late Corn Corn Earworm Numbers Lower, Silking Corn Requires Protection Situation Most parts of the state are still very dry and irrigation sources are being strained on many farms. Heat and drought have caused some pollination and fill problems with corn ears, especially in unirrigated fields, but later planted corn is mostly […]<\/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,"footnotes":""},"categories":[150],"tags":[],"class_list":["post-13547","post","type-post","status-publish","format-standard","hentry","category-sweet-corn-ipm-newsletter"],"yoast_head":"\nSweet Corn IPM Newsletter No. 9 - August 21, 2026 - 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\/2026\/08\/21\/sweet-corn-ipm-newsletter-no-9-august-21-2026\/\" \/>\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. 9 - August 21, 2026 - Cooperative Extension at Highmoor Farm - University of Maine Cooperative Extension\" \/>\n<meta property=\"og:description\" content=\"Fall Armyworm Threatens Late Corn Corn Earworm Numbers Lower, Silking Corn Requires Protection Situation Most parts of the state are still very dry and irrigation sources are being strained on many farms. 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