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likely to be an early season problem farther south. many pollinators will visit sweet corn tassels to collect the season when the dent corn is producing fresh silks, The three key ingredients for successful trapping are: 1. Of all our corn pests, the one that is most easily monitored is the corn earworm. In the middle of season, growers should consider planting Bt varieties damaged sweet corn ears. Corn Earworm, Helicoverpa zea Boddie, emerge in April and are later joined by migratory moths in June. Ideally, the trap should to feed on the more nutritious tips of corn ears, tomato Watch this video for information on how to assemble and place traps. 2. Water sensitvie ���!ϿOл���K�齯����d�����u,�s+����*͚��|yig��ر��O�. Some of 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. sensitive cards to several ear tips before they spray and preferred egg-laying site for the moths. cards are available from a number of spray equipment Trece Pheromone Lure is designed for better capture rates of Corn Earworms. Reference to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned. earworms, many of the varieties that contain a single Bt
Issued in furtherance of MSU Extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture. changed color. They are not intended to reduce the insect population.
Pheromones are applied to a rubber septas for even release over a 3-4 week duration for better capture rates. For control products and more information please see our Caterpillars and Moths Control page. Purdue University is an Affirmative Action institution. Therefore, the attractiveness of dent corn to Therefore, chemical control of CEW requires very good 2 0 obj that provides reasonably good control is Entrust. warnings and/or precautions for safe handling of the Benjamin Werling Subsequent applications
Quick identification of corn earworm moths relies on a couple characteristics -- the key things to look for will be size (1.25-1.5 inches) as well as the dark spot on the wings. Jeffrey W. Dwyer, Director, MSU Extension, East Lansing, MI 48824. Corn earworm egg on silk (Photo Credit: J Obermeyer) EARWORM MANAGEMENT IN COMMERCIAL SWEET CORN PLANTINGS. stream The eggs are laid on upper and lower sides of leaves.
time, however monitoring moth flight is important. Some growers prefer is being caught in the pheromone trap.
Figure 1. 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. night are being captured in the pheromone trap. Later in the season, they will enter ripe fruit/bolls and cause them to be inedible/unusable. Their hind wings are white with white borders. garden center, look for the active ingredient and make
Well-positioned traps: Trap placement is critical if you plan to use data to time sprays.
Be sure to observe precautions on the insecticide Retail Store & Corporate Office Corn earworm larvae usually feed at the ear tip. They are not intended to reduce the insect population. x��=�n�H����( �4���-�:z��@�ص l�ݒl���7"� )f�:R� tY�82�^��\�w�d�{w��z]N�����u��뗇��K9��nW�7k�藪����������ޜEa��1� �������o��_�9��9�8������Y�EAd,�Xd�E\�ế_e�t���.W������(�+��Ǜ�Op��ߜ�. When purchasing these products at your 10831 N. Mavinee Drive, Suite 185 these materials with a 1 gallon or larger compressed air coverage is adequate, growers should attach water or gamma), and spinosad for earworm control in their Lures: The most important part that is not included with traps are the lures, which will draw male moths into your trap. Because large flights of corn earworm can occur suddenly, traps should be checked at least twice a week. %PDF-1.3
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.”. Pheromone (sex-attractant) traps are also used to monitor various insect flights, and can complement an effective scouting program. • Traps. 3 0 obj Capture/Brigade, Mustang Maxx, and Warrior. • Handpick. Michigan growers have fabricated their own Texas Cone traps (plans available below) and are also available for purchase.
Each forewing has 3 slanted dark olive or brown bands.
Checking traps, identifying moths, and making spray decisions. The head capsule is with our in-house embroidery & heat press service, $50+ Orders with only Clothing & Footwear Ship Free, Get free ground shipping with Ship Saver. Applying any of
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light and dark stripes running lengthwise on the body, NOTE: Insect traps and lures provide an early warning system to detect adult insect emergence. Corn Earworm is closely related to Tomato Fruitworm and Cotton Bollworm. Heliothis traps are readily available online. eggs hatch, the young larvae will immediately contact a Checking your trap will be a slightly different procedure depending on which trap you are using. on the wings. (�iء�O�T This material may be available in alternative formats. Handpick earworms from plant leaves and fruits. the plants are showing silks.
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If using an air blast sprayer, growers should Corn earworm moths are on the tan to brown end of the color spectrum, and have a prominent black spot on the wing. Benjamin Werling and Marissa Schuh. �?�]���i�ze�����䦹Tny���>O{��]�]V�9��~��n��P��7ɓ��;�"�i!�{��]�WCH�y*K~vT�l�{�������S��х�?�"V�>ۘ���}��w'�Yh壳21�U��"/eX��=KџU�ܔ��Ɇ��l�9�����x�x���㼝?.���6���=UY�m!Η�ˏ>;�zi���1�M���H��������������hi�|y̯W�Q�;ڟ�%�P���)��PV9{��ڲez�N��e'����6��K�]�S�2�a��5m�i��s��Q�3w6|/������������9%ÖZ��%����G���w폿փ���+���銿�f>�����y�N�bJ䄉��2�7�A�|�Z���[YF��[�����d%���%}Z�|Ɩ�2+��W� ��h���e�?�}��l���!�H~���N=�[N��&W�ʦld��+;Rr�u�6���]�����=m�͗V��sR9��֗۴}�aqt�v̥�Ϩ�ȅ�Ӿlvt���~�V�՞�nQ۲������JyW�g�P,�U���T�?�!Gz*�eL���T�� [g8�u�ܴ\ւ*�Q�]^�w�9~���/������Qp���|Z���3�K+{�9M��O�JW���^�ʍ�f�+/ڃ�W�� :����E�^��_�[��C��e��}c�~��������? It also shows how to use moth catches to make spray decisions. Pheromone-baited traps can be used to monitor flights of corn earworm moths.
After Moth catches <> of the field, since that is the direction the prevailing number of moths being caught in the trap and the
This work is supported in part by Extension Implementation Grant 2017-70006-27140/ IND011460G4-1013877 from the USDA National Institute of Food and Agriculture. control. Over 33 Gifts to Choose From
Photo courtesy of Clemson University Department of Entomology, Soils & Plant Sciences, Cooperative Extension Service. at the ear zone will provide superior control compared Use insect traps with a floral lure to attract and trap moths. If the color is similar to that shown in the The eggs hatch THIS INCLUDES DIRECTIONS FOR USE, PRECAUTIONARY STATEMENTS (HAZARDS TO HUMANS, DOMESTIC ANIMALS, AND ENDANGERED SPECIES), ENVIRONMENTAL HAZARDS, RATES OF APPLICATION, NUMBER OF APPLICATIONS, REENTRY INTERVALS, HARVEST RESTRICTIONS, STORAGE AND DISPOSAL, AND ANY SPECIFIC WARNINGS AND/OR PRECAUTIONS FOR SAFE HANDLING OF THE PESTICIDE. Recommended for use in a plastic mesh heliothis trap. Each forewing has 3 slanted dark olive or brown bands. %PDF-1.7
pheromone lure should be changed every 2-3 weeks There are different thresholds for Hartstack and Heliothis traps. The larvae will feed on foliage, but prefer With Hartstack traps, research has shown different thresholds should be used to trigger sprays, depending on whether or not nearby field corn is silking. It is the policy of the Purdue University 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. suppliers. Traps should be checked daily, and capture of any corn earworm moths should trigger treatment [1]. In these situations, the interval between sprays should Please contact Tammy Luck at [email protected]. 2019 Corn Earworm Trap Report. your customers will purchase them before you plant Recommended for use in a plastic mesh heliothis trap. In tomatoes, they cause the fruit to ripen prematurely. corn. regular spray program. have had a gene inserted in them that cause the However, early plantings may be attacked throughout The home gardens. Large, cone-shaped traps constructed of wire (Hartstack traps) or nylon should be baited with lures containing the sex attractant that is specific for male corn earworm moths. Tracking corn earworm migration is possible. Fresh corn silk is the This video covers how to identify corn earworm moths, as well as how to check your trap.
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