Both are equivalent in size and appearance. Tomato and tobacco hornworms are closely related species that cause similar damage to the same host plants. (Oklahoma State University (Entomology & Plant Pathology) Corn Earworm (Utah Vegetable Production & Pest Management Guide)įive-spotted hawkmoth (Manduca quinquemaculata), the adult stage of the tomato hornworm.Corn Earworm Fact Sheet (USU Extension Fact Sheet).
pyrethrins + piperonyl butoxide (Worry-free Insecticide and Miticide).lambda-cyhalothrin (Spectracide Triazicide).cyfluthrin (BioAdvanced Vegeetable and Garden Insect Spray).bifenthrin + zeta-cypermethrin (Ortho Bug-B-Gon Max Lawn and Garden Insect Killer).(effective upon ingestion by larvae, but no contact activity effective for tomato and pepper, but not corn) (suffocate eggs on silks, must reapply every 2 to 3 days for suppression only) horticultural mineral oil (many brands).
(not effective on moths, must be ingested by larvae effective in tomato and pepper if reapplied every 2 to 3 days not effective in corn) Bacillus thuringiensis (Dipel, Thuricide, others).Options available for commercial growers: Wasps can be purchased and released into corn fields. Trichogramma wasps are parasitic toward CEW eggs.Tilling corn fields in the fall will decrease the survival rate of pupae.Plant sweet corn earlier in the season to allow for the silk to develop before moth activity occurs.Traps are cone shaped and made of vinyl mesh netting. CEW is best monitored using a pheromone lure in a net trap. Around now in late August and September would be the estimated time for the second and third flights.
In northern Utah, three flights typically occur a year. CEW moths lay individual eggs on fresh, green corn silks. In tomatoes, CEW larvae will tunnel into the fruits and chew holes in the leaves, stems, and flowers Monitoring:Īdult moths are most active at dusk, and can be carried by wind currents traveling hundreds of miles. Direct damage usually occurs at the ear tip by feeding on kernels, also damage to the silk can decrease pollination leading to poor ear development. Damage:ĬEW can cause several types of injury. CEW overwinters in the pupae stage in central and southern Utah and immigrates into northern Utah each spring. The adult moth is tan with a distinct spot and dark margin on its forewings. The larvae have a brown head with alternating dark and light stipes along the length of its body. CEW is the most destructive pest to Utah’s sweet corn. Trichogramma are tiny wasps that parasitize insect eggsĬorn Earworm (CEW) and Tomato Fruit worm are common names given to the larvae stage of Helicoverpa zea.
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