{"id":13423,"date":"2026-07-02T11:53:51","date_gmt":"2026-07-02T15:53:51","guid":{"rendered":"https:\/\/extension.umaine.edu\/highmoor\/?p=13423"},"modified":"2026-07-02T11:53:51","modified_gmt":"2026-07-02T15:53:51","slug":"sweet-corn-ipm-newsletter-no-2-july-2-2026","status":"publish","type":"post","link":"https:\/\/extension.umaine.edu\/highmoor\/2026\/07\/02\/sweet-corn-ipm-newsletter-no-2-july-2-2026\/","title":{"rendered":"Sweet Corn IPM Newsletter No. 2 — July 2, 2026"},"content":{"rendered":"

Corn Earworm Threatens Early Silking Corn<\/h3>\n

First Fall Armyworm Moths Caught This Week<\/h4>\n

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

\"Corn<\/a>
Corn Earworm Feeding on Corn; photo by David Handley<\/figcaption><\/figure>\n

Early planted corn suffered from cold soils at many locations, so germination has been spotty at some sites, but recent warm temperatures have pushed development rapidly. Some fields seeded under clear plastic mulch are just beginning to silk in southern Maine, while most early plantings are at late whorl to pre-tassel.<\/p>\n

European corn borer<\/strong>: We have caught very few European corn borer moths so far this season, but we have found larval feeding in late whorl and pre-tassel corn at some sites, still below the recommended spray threshold of 15% injury, so no sprays have been recommended (see table below). Sprays during the pre-tassel stage, when both moths and larvae are present, are good for targeting the larvae before they can move into the protection of the stalks and ears. Rotate the type of insecticide (IRAC Group number) used to prevent insect resistance from developing. Materials registered for controlling European corn borer include Bacillus thuringiensis<\/em> products (XenTari\u00ae, Dipel DF\u00ae); Avaunt\u00ae, Coragen\u00ae, Warrior II\u00ae, Lannate\u00ae, Baythroid\u00ae, Asana\u00ae, Radiant\u00ae, Delta Gold\u00ae, Mustang\u00ae, Sevin XLR\u00ae and Intrepid\u00ae.<\/p>\n

Corn earworm<\/strong>: Corn earworm moths have been active this week. This is a somewhat early arrival of this pest, and only a few early corn fields are showing silk, which is what the moths prefer to lay their eggs upon. This pest is only a concern for fields with corn in the silk stage. The moths lay eggs on the fresh silks, and the larvae move directly into the ears of corn. It is recommended that insecticide products in IRAC Group 3A should not be used alone to control CEW due to developing resistance. Combining them with another material from a different IRAC group (e.g. Lannate, Coragen or Blackhawk \/Radiant) will improve effectiveness.<\/p>\n

\"Male<\/a>
Male Fall Armyworm Moth; photo by David Handley<\/figcaption><\/figure>\n

Fall armyworm<\/strong>: We caught fall armyworm moths in pheromone traps at two locations this week. We have not yet found any larval feeding damage in the field. Pheromone trap catches of moths indicate if there is a direct threat to silking corn. However, neither site was over the threshold of 3 moths caught when corn is in silk stage. Corn is often on a spray program for corn earworm when fall armyworm is found.<\/p>\n

Squash vine borer<\/strong>: One site in Oxford was over the threshold of 5 moths caught in a pheromone trap this week, indicating that egg laying is ongoing at this time. Moths have been caught in several other locations, but numbers have not yet reached threshold. See the New England Vegetable Management Guide<\/a> for control options.<\/p>\n

Potato leafhopper alert<\/strong>: We have been finding leafhopper damage (\u201chopper burn\u201d) in beans and strawberries this week. Leafhoppers cause leaves to become curled and yellow-streaked. To scout for them, look for small, light green nymphs on the underside of injured leaves. They are about 1\/16 inch long. When touched, they will crawl sideways in a crab-like manner. Control options for potato leafhoppers are listed in the New England Vegetable Management Guide<\/a>.<\/p>\n

 <\/p>\n

\"Close<\/a>
Leafhopper nymphs; photo credit David Handley, UMaine Cooperative Extension.<\/figcaption><\/figure>\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

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
Bowdoinham<\/td>\n2<\/td>\n0<\/td>\n0<\/td>\n3%<\/td>\nNo spray recommended (no silking corn)<\/td>\n<\/tr>\n
Cape Elizabeth<\/td>\n3<\/td>\n0<\/td>\n0<\/td>\n0%<\/td>\nNo spray recommended (no silking 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
Farmington<\/td>\n0<\/td>\n0<\/td>\n0<\/td>\n14%<\/td>\nNo spray recommended<\/td>\n<\/tr>\n
Gray<\/td>\n2<\/td>\n0<\/td>\n1<\/td>\n0%<\/td>\n6-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Lewiston I<\/td>\n4<\/td>\n0<\/td>\n0<\/td>\n8%<\/td>\nNo spray recommended (no silking corn)<\/td>\n<\/tr>\n
Lewiston II<\/td>\n3<\/td>\n0<\/td>\n0<\/td>\n4%<\/td>\n6-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Oxford<\/td>\n0<\/td>\n0<\/td>\n0<\/td>\n10%<\/td>\nNo spray recommended<\/td>\n<\/tr>\n
Wayne<\/td>\n2<\/td>\n0<\/td>\n0<\/td>\n1%<\/td>\n6-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Wells<\/td>\n1<\/td>\n1<\/td>\n0<\/td>\n0%<\/td>\nNo spray recommended (no silking corn)<\/td>\n<\/tr>\n
Wells II<\/td>\n0<\/td>\n0<\/td>\n1<\/td>\n6%<\/td>\nNo spray recommended<\/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 Threatens Early Silking Corn First Fall Armyworm Moths Caught This Week Situation Early planted corn suffered from cold soils at many locations, so germination has been spotty at some sites, but recent warm temperatures have pushed development rapidly. Some fields seeded under clear plastic mulch are just beginning to silk in southern Maine, […]<\/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-13423","post","type-post","status-publish","format-standard","hentry","category-sweet-corn-ipm-newsletter"],"yoast_head":"\nSweet Corn IPM Newsletter No. 2 - July 2, 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\/07\/02\/sweet-corn-ipm-newsletter-no-2-july-2-2026\/\" \/>\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. 2 - July 2, 2026 - Cooperative Extension at Highmoor Farm - University of Maine Cooperative Extension\" \/>\n<meta property=\"og:description\" content=\"Corn Earworm Threatens Early Silking Corn First Fall Armyworm Moths Caught This Week Situation Early planted corn suffered from cold soils at many locations, so germination has been spotty at some sites, but recent warm temperatures have pushed development rapidly. 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