Ideally, tobacco should be checked weekly from topping until harvest to determine if hornworm numbers justify treatment. Hornworm infestations must be handled in the field before housing. There are no registered or effective treatments to control hornworms feeding on tobacco in the curing barn. Hornworms present when the tobacco was cut will be taken to the barn where they will continue to feed until they complete their development and drop to the barn floor. That leaves plenty of time for late-flying moths to lay eggs that lead to infestations. The residual protection from the application usually lasts for 5 to 7 days. The long flight period means that infestations can develop even if the crop was sprayed with an insecticide soon after topping. Tobacco hornworm moths fly during much of August and early September, attaching single eggs to the undersides of tobacco leaves in the upper 1/3 of the plant.
University of Kentucky College of Agriculture
ENTFACT-151: Keeping Hornworms from the Curing Barn | Download PDF by Lee Townsend, Extension EntomologistĪnd Bob Pearce, Extension Tobacco Production Specialist
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