Each forewing has 3 slanted dark olive or brown bands. changed color. Disability-related accessibility issue? Order or download materials from edustore.purdue.edu, Purdue Extension Entomology, 901 W. State Street, West Lafayette, IN 47907, (765) 494-8761, Department of Entomology | College of Agriculture | Extension, © 2016 Purdue University | An equal access/equal opportunity university | Copyright Complaints | Maintained by Tammy Luck. many pollinators will visit sweet corn tassels to collect By monitoring your Hartstack trap and calculating the average number of moths being captured per day, you can make informed decisions about when and how often to spray (see the Midwest Vegetable Production Guide E-0312 for more information on corn earworm control). includes directions for use, precautionary statements Checking traps, identifying moths, and making spray decisions. kernels and fouling the ear with excrement. Look for the species name of corn earworm when choosing lures - Helicoverpa zea - as it goes by many common names, including tomato fruitworm and cotton bollworm. Some of * For new customers only. In cotton, they leave gouges on the surface of the boll where rot organisms enter and spoil the cotton crop. A Heltiothis trap and (left) and a Hartstack Trap (right) Photo credit : Eric Burkness, Bugwood.org. of sweet corn begins to tassel. regular spray program. READ AND FOLLOW ALL LABEL INSTRUCTIONS. Coragen and Radiant have provided the highest levels of Recommended for use in a plastic mesh heliothis trap. Knock out problem Corn Earworm populations like a champ with these Trece Lures. light and dark stripes running lengthwise on the body, damaged sweet corn ears. be injured, because CEW is between generations at that Issued in furtherance of MSU Extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture. Bacillus thuringiensis, or Bt. the newer Bt varieties have multiple genes for earworm dent corn is again unattractive to the moths. This larva has entered the ear, there is no effective control. Knock out problem Corn Earworm populations like a champ with these Trece Lures. For Heliothis traps, The Ohio State University Extension has published thresholds, which can be found in “How to use pheromone traps to help manage corn earworm & European corn borer on sweet corn in Ohio.”. corn. When a southern source of corn earworm is detected, it could be from a number of factors: Water sensitvie They are not intended to reduce the insect population. corn is generally surrounded by many acres of dent <> area 10 X 50 feet (i.e., 3-4 rows 50 feet long). Oro Valley, AZ 85737-9531. Ideally, the trap should Color varies from greenish-yellow and reddish-brown or even black with paler stripes running lengthwise on the body. sure it matches one of the above products. in 2-5 days, depending on temperature. your customers will purchase them before you plant It is important to note that while pollinators In these situations, the interval between sprays should The eggs are laid on upper and lower sides of leaves. Commercial sweet corn growers are encouraged to use pheromone traps to monitor for the presence of CEW moths. Photo courtesy of Clemson University Department of Entomology, Soils & Plant Sciences, Cooperative Extension Service. laid. be sold under a variety of trade names, but the active Trece Pheromone Lure is designed for better capture rates of Corn Earworms. It involves the daily monitoring of insect traps throughout the country and is based on the hypothesis that increases in insect-trap counts correspond with increased migration risks. few inches from the silks and spray directly into them. The corn earworm (CEW), also known as the tomato should again be reduced to 1 moth per night, because Corn maturing in mid-season is less likely to Nozzle adjustment to apply insecticide to ear Earworm larvae come in many different colors pesticides. (Photo Credit: A. Jacobson), Spray Equipment Needed. pollen. restrictions, storage and disposal, and any specific How to use pheromone traps to help manage corn earworm & European corn borer on sweet corn in Ohio, Purdue University - Corn earworm bulletin, Weather-based corn earworm flight forecaster, Diagrams for fabricating a Hartstack Trap. exceeding the threshold (1 or 10 moths per night), the Watch this video to learn how corn earworm biology makes timing critical for control. The Adult moths are usually light yellowish-olive with a single dark spot near the center of each forewing. control (as well as control of European corn borer and It is the policy of the Purdue University Cooperative Extension Service that all persons have equal opportunity and access to its educational programs, services, activities, and facilities without regard to race, religion, color, sex, age, national origin or ancestry, marital status, parental status, sexual orientation, disability or status as a veteran. Tracking corn earworm migration is possible. Hold the nozzle a ears only through the tip, not through the side or shank until most of the silks have turned brown and are no moths. earworms by planting early, because sweet corn that The Applying any of <>/ExtGState<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/Annots[ 13 0 R 14 0 R] /MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> Since moth counts to feed on the more nutritious tips of corn ears, tomato with our in-house embroidery & heat press service, $50+ Orders with only Clothing & Footwear Ship Free, Get free ground shipping with Ship Saver. cards are available from a number of spray equipment the plants are showing silks. They may Economic Threshold: When tassels emerge and silks are still green, numbers of corn earworm moths captured in pheromone traps will determine the frequency of insecticide applications. The pheromone trap should be placed in freshly silking corn with the lure at ear height (Photo B).
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