{"id":12497,"date":"2025-08-08T12:46:45","date_gmt":"2025-08-08T16:46:45","guid":{"rendered":"https:\/\/extension.umaine.edu\/highmoor\/?p=12497"},"modified":"2025-08-08T13:41:56","modified_gmt":"2025-08-08T17:41:56","slug":"sweet-corn-ipm-newsletter-no-6-august-8-2025","status":"publish","type":"post","link":"https:\/\/extension.umaine.edu\/highmoor\/2025\/08\/08\/sweet-corn-ipm-newsletter-no-6-august-8-2025\/","title":{"rendered":"Sweet Corn IPM Newsletter No. 6 \u2014 August 8, 2025"},"content":{"rendered":"

CORN EARWORM PRESSURE MODERATE<\/h3>\n

Silking Corn Threatened By Fall Armyworm, Western Bean Cutworm<\/h4>\n

SITUATION<\/strong><\/p>\n

\"Western
Western Bean Cutworm Moth; photo by Lindsey Ridlon<\/figcaption><\/figure>\n

Very warm, dry weather continues to speed corn growth. Some fields intended for Labor Day harvest will likely be ready much earlier. Quality continues to be very good, especially in fields that have been irrigated through the dry spell. Pest pressure continues to be moderate this week, with corn earworm and fall armyworm numbers lower. Only western bean cutworm has widespread numbers of concern this week.<\/p>\n

European corn borer: <\/strong>Moth counts remain very low this week. Trap captures of moths exceeded the control threshold (5) for silking corn only in Palmyra. Very little larvae feeding has been found in fields. While it appears the first generation of borer is over, a second generation of this pest, usually very late in the season is possible.<\/p>\n

Corn earworm: <\/strong>Moth numbers remain low at most locations this week, with only four sites on a recommended spray schedule for fresh silking corn. A four-day spray interval for silking corn was recommended for Gray and one Wells site; a six-day spray interval was recommended for Bowdoinham and the other Wells location. Fields not yet in silk do not need to be protected from corn earworm.<\/p>\n

Fall armyworm: <\/strong>Moths counts in pheromone traps exceeded the control threshold (3) for silking corn in Biddeford, Cape Elizabeth, Gray, Monmouth, Oxford, Wayne and one Wells site this week. Sprays for silking corn were recommended for Biddeford, Monmouth, and the Wells sites, which are not presently under a spray interval for earworm. Armyworm feeding damage was low this week. None of the sites scouted exceeded the control threshold of 15% injury.<\/p>\n

Western Bean Cutworm: <\/strong>Depending on location, moth counts ranged from 3 to 122 in our pheromone traps this week, indicating a continued peak in the flight of this pest. All sites were over our suggested threshold of three moths per week, but 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 Dayton, Durham, Farmington, Lewiston and Oxford.<\/p>\n

\"Close<\/a>
Corn flea beetles; photo by David Handley, UMaine Cooperative Extension<\/figcaption><\/figure>\n

Corn flea beetles<\/strong> have been observed in several fields over the past few weeks. In high numbers these insects can injure young, whorl stage corn, but are more often a concern because they can spread bacterial wilt, also known as Stewart\u2019s wilt, a serious disease of corn. Most sweet corn varieties today have good resistance to Stewart\u2019s wilt, so the disease is not considered a problem. The levels of damage from feeding we have seen is not significant, so we have not recommended any control.<\/p>\n

Squash vine borer: <\/strong>Two sites, Cape Elizabeth and Gray, were over the five moth per week threshold, and controls for young summer squash plantings were recommended.<\/p>\n

Cucurbit Downy Mildew Alert:<\/strong> We continue to be on alert for this important disease of cucumbers, melons and squash. There have not yet been any confirmed cases in Maine.<\/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>\n1<\/td>\n0<\/td>\n34<\/td>\n5%<\/td>\nOne spray for FAW on silking corn<\/td>\n<\/tr>\n
Bowdoinham<\/td>\n2<\/td>\n0<\/td>\n2<\/td>\n4%<\/td>\n6-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Cape Elizabeth<\/td>\n1<\/td>\n0<\/td>\n5<\/td>\n9%<\/td>\nOne spray for FAW on silking corn<\/td>\n<\/tr>\n
Dayton<\/td>\n1<\/td>\n0<\/td>\n2<\/td>\n0%<\/td>\nOne spray for western bean cutworm (see text above)<\/td>\n<\/tr>\n
Durham<\/td>\n0<\/td>\n0<\/td>\n1<\/td>\n<\/td>\nOne spray for western bean cutworm (see text above)<\/td>\n<\/tr>\n
Farmington<\/td>\n0<\/td>\n1<\/td>\n0<\/td>\n<\/td>\nOne spray for western bean cutworm (see text above)<\/td>\n<\/tr>\n
Garland<\/td>\n1<\/td>\n2<\/td>\n0<\/td>\n0%<\/td>\nNo spray recommended<\/td>\n<\/tr>\n
Gray<\/td>\n23<\/td>\n0<\/td>\n29<\/td>\n9%<\/td>\n4-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Lewiston<\/td>\n0<\/td>\n0<\/td>\n1<\/td>\n<\/td>\nOne spray for western bean cutworm (see text above)<\/td>\n<\/tr>\n
Monmouth<\/td>\n0<\/td>\n0<\/td>\n4<\/td>\n0%<\/td>\nOne spray for FAW on silking corn<\/td>\n<\/tr>\n
Oxford<\/td>\n0<\/td>\n4<\/td>\n1<\/td>\n0%<\/td>\nOne spray for western bean cutworm (see text above)<\/td>\n<\/tr>\n
Palmyra<\/td>\n0<\/td>\n5<\/td>\n0<\/td>\n0%<\/td>\nOne spray for ECB on silking corn<\/td>\n<\/tr>\n
Wayne<\/td>\n1<\/td>\n0<\/td>\n3<\/td>\n0%<\/td>\nOne spray for FAW on silking corn<\/td>\n<\/tr>\n
Wells I<\/td>\n2<\/td>\n0<\/td>\n0<\/td>\n0%<\/td>\n6-day spray interval recommended for silking corn<\/td>\n<\/tr>\n
Wells II<\/td>\n10<\/td>\n2<\/td>\n4<\/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

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":"

CORN EARWORM PRESSURE MODERATE Silking Corn Threatened By Fall Armyworm, Western Bean Cutworm SITUATION Very warm, dry weather continues to speed corn growth. Some fields intended for Labor Day harvest will likely be ready much earlier. Quality continues to be very good, especially in fields that have been irrigated through the dry spell. Pest pressure […]<\/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-12497","post","type-post","status-publish","format-standard","hentry","category-sweet-corn-ipm-newsletter"],"yoast_head":"\nSweet Corn IPM Newsletter No. 6 \u2014 August 8, 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\/08\/sweet-corn-ipm-newsletter-no-6-august-8-2025\/\" \/>\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. 6 \u2014 August 8, 2025 - Cooperative Extension at Highmoor Farm - University of Maine Cooperative Extension\" \/>\n<meta property=\"og:description\" content=\"CORN EARWORM PRESSURE MODERATE Silking Corn Threatened By Fall Armyworm, Western Bean Cutworm SITUATION Very warm, dry weather continues to speed corn growth. 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