Fall Armyworms
“That field looked fine when I drove by it Wednesday afternoon, but when I came back to cut it on Saturday it was nothing but stems!”
Fall armyworm, Spodoptera frugiperda, is the most damaging insect pest of bermudagrass hayfields. These caterpillars can destroy an entire cutting of hay in just a couple of days. The reason for this rapid crop loss is that the caterpillars do 80 to 90% of their feeding in the last two to three days of their life. During the summer months fall armyworms remain in the caterpillar stage for around 10 to 14 days, but young caterpillars eat very little, and their damage is easy to overlook.
By the time they are ¾ to 1 inch long fall armyworm caterpillars are leaf-eating machines that rapidly consume large amounts of leaf area. Multiply the leaf consumption of a single caterpillar by the hundreds of thousands of caterpillars per acre that occur during heavy outbreaks, and it is easy to understand how fall armyworms can cause such rapid defoliation. This is why experienced cattlemen and hay producers learn to scout their fields every two to three days during periods when fall armyworms are a threat and to have their spray equipment ready to go.
See Extension Publication 2717, Fall Armyworms in Hayfields and Pastures for fall armyworm treatment recommendations and information on fall armyworm biology and how to best protect bermudagrass hayfields from this damaging pest.
Contact
Dr. Blake Layton, Extension Entomology Specialist
Department of Entomology, Mississippi State University
Phone: (662) 325-2085
Email: [email protected]
Publications
News
STARKVILLE, Miss. -- Agricultural producers and consultants are encouraged to register for the annual Mississippi State University Row Crop Short Course.
The tarnished plant bug is Mississippi’s No. 1 most economically damaging insect in cotton, costing an estimated $42 million in yield losses plus millions more spent to control the pest.
When managing insects and diseases in row crops, growers typically act after a problem appears, but there are no reactive treatments for some pests, including soil insects that attack seeds and developing seedlings.
Management such as seed treatments or in-furrow insecticides for these pests has to be applied at the time of planting. Mississippi State University researchers say seed treatments make good sense for many crops.
Success Stories
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