{"id":13516,"date":"2026-08-07T11:01:36","date_gmt":"2026-08-07T15:01:36","guid":{"rendered":"https:\/\/extension.umaine.edu\/highmoor\/?p=13516"},"modified":"2026-08-14T14:24:48","modified_gmt":"2026-08-14T18:24:48","slug":"sweet-corn-ipm-newsletter-no-7-august-7-2026","status":"publish","type":"post","link":"https:\/\/extension.umaine.edu\/highmoor\/2026\/08\/07\/sweet-corn-ipm-newsletter-no-7-august-7-2026\/","title":{"rendered":"Sweet Corn IPM Newsletter No. 7 — August 7, 2026"},"content":{"rendered":"

Corn Earworm Remain High<\/h3>\n

Silking Corn Requires Protection at All Sites<\/h4>\n
\"Corn
Corn Earworm Moth; photo by David Handley<\/figcaption><\/figure>\n

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

Rainfall early in the week provided some much needed relief to dry cornfields, but most sites are still experiencing well below normal rainfall and irrigating wherever possible. Quality of early corn has reportedly been good. As growers move into later planted corn, there is a notable lack of uniformity in stand and maturity in many fields, likely due to heat and moisture stress. Corn earworm numbers continue to be high in nearly all locations this week, and all silking fields require protection.<\/p>\n

European corn borer<\/strong>: Moth counts continue to be very low, although we did catch 5 moths at one site in Lewiston, which is over the threshold for silking corn. The site is already under a spray interval for corn earworm, so no additional sprays were recommended. Larval feeding damage continues to be very low, and no sprays were recommended for corn that is not yet silking.<\/p>\n

Corn earworm<\/strong>: Moth counts continue to be very high in nearly all coastal and southern locations. All sites are now on a spray interval for fresh silking corn. A 6-day spray interval for silking corn was recommended in Oxford and Palmyra; A 4-day spray interval was recommended for Biddeford, Bowdoinham, Garland, Farmington, Lewiston Wayne and Wells. A 3-day spray interval was recommended in Cape Elizabeth, Dayton, and Gray.<\/p>\n

Fall armyworm<\/strong>: Moth numbers in pheromone traps were higher at some locations this week, exceeding the threshold of three per week in silking corn at Biddeford, Bowdoinham, Cape Elizabeth, Gray, Lewiston, Monmouth and one Wells site. All of these locations are either on a spray schedule for corn earworm, which should also control fall army worm, or do not yet have silking corn. Fall armyworm larval feeding damage was generally light and not over the recommended spray threshold.<\/p>\n

Western Bean Cutworm<\/strong>: Moth and egg mass counts were variable this week, but mostly lower. However, nearly all sites 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, which should protect silking corn from western bean cutworm as well. No larval feeding injury exceeded the spray threshold for pre-tassel corn.<\/p>\n

Squash vine borer<\/strong>: Moth numbers in pheromone traps continued to be low this week, although one site in Oxford did exceed the 5-moth threshold. A spray was recommended for any younger squash, especially summer squash, that might be affected.<\/p>\n

\"Close<\/a>
Sooty mold on corn husks caused by the honeydew produced by aphids; photo by David Handley, UMaine Cooperative Extension.<\/figcaption><\/figure>\n

Corn leaf aphids<\/strong> are infesting tassels in nearly every field. Although it is unlikely that this will have significant impact on pollination, the colonies of aphids will migrate to the husks and may result in sooty mold. Sprays applied for corn earworm usually control aphids. Sprays specifically for aphids would only be recommended if sooty mold is becoming a problem.<\/p>\n

Save the Date!<\/h4>\n

New England Vegetable and Fruit Conference<\/strong>\u00a0will take place at the Double Tree in Manchester, New Hampshire. The conference offers 3 days of talks, covering several crops and topics, farmer to farmer sessions and more. Dates for the conference are December 15, 16, 17, 2026.
\nRegistration and schedule information can be found on the New England Vegetable and Fruit Conference<\/a> website.<\/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>\n23<\/td>\n0<\/td>\n4<\/td>\n2<\/td>\n3%<\/td>\n4-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Bowdoinham<\/td>\n29<\/td>\n1<\/td>\n3<\/td>\n8<\/td>\n2%<\/td>\n4-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Cape Elizabeth<\/td>\n140<\/td>\n0<\/td>\n7<\/td>\n3<\/td>\n–<\/td>\n3-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Dayton<\/td>\n130<\/td>\n0<\/td>\n0<\/td>\n13<\/td>\n0%<\/td>\n3-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Farmington<\/td>\n16<\/td>\n0<\/td>\n1<\/td>\n16<\/td>\n–<\/td>\n4-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Garland<\/td>\n9<\/td>\n0<\/td>\n0<\/td>\n–<\/td>\n0%<\/td>\n4-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Gray<\/td>\n195<\/td>\n0<\/td>\n16<\/td>\n150<\/td>\n–<\/td>\n3-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Lewiston I<\/td>\n84<\/td>\n0<\/td>\n1<\/td>\n10<\/td>\n–<\/td>\n4-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Lewiston II<\/td>\n68<\/td>\n5<\/td>\n16<\/td>\n88<\/td>\n0%<\/td>\n4-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Monmouth<\/td>\n24<\/td>\n0<\/td>\n6<\/td>\n47<\/td>\n5%<\/td>\nNo spray recommended (no silking corn)<\/td>\n<\/tr>\n
Oxford<\/td>\n3<\/td>\n1<\/td>\n2<\/td>\n50<\/td>\n0%<\/td>\n6-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Palmyra<\/td>\n2<\/td>\n0<\/td>\n1<\/td>\n–<\/td>\n–<\/td>\n6-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Wayne<\/td>\n9<\/td>\n0<\/td>\n0<\/td>\n26<\/td>\n1%<\/td>\n4-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Wells<\/td>\n44<\/td>\n0<\/td>\n3<\/td>\n9<\/td>\n4%<\/td>\n4-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Wells II<\/td>\n65<\/td>\n0<\/td>\n1<\/td>\n6<\/td>\n0%<\/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":"

Corn Earworm Remain High Silking Corn Requires Protection at All Sites Situation Rainfall early in the week provided some much needed relief to dry cornfields, but most sites are still experiencing well below normal rainfall and irrigating wherever possible. Quality of early corn has reportedly been good. As growers move into later planted corn, there […]<\/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-13516","post","type-post","status-publish","format-standard","hentry","category-sweet-corn-ipm-newsletter"],"yoast_head":"\nSweet Corn IPM Newsletter No. 7 - August 7, 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\/07\/sweet-corn-ipm-newsletter-no-7-august-7-2026\/\" \/>\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. 7 - August 7, 2026 - Cooperative Extension at Highmoor Farm - University of Maine Cooperative Extension\" \/>\n<meta property=\"og:description\" content=\"Corn Earworm Remain High Silking Corn Requires Protection at All Sites Situation Rainfall early in the week provided some much needed relief to dry cornfields, but most sites are still experiencing well below normal rainfall and irrigating wherever possible. 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