Webworms have made their debut in Oklahoma due to the unusual amount of rainfall this past couple of months.
According to the Oklahoma Cooperative Extension Service, Division of Agricultural Sciences and Natural Resources at Oklahoma State University, each female can lay 400 to 500 eggs in masses on the underside of leaves. Two races or forms of the larvae occur in Oklahoma.
Larvae may be pale yellow, yellowish green, greenish, or orange, but most have two rows of black spots down the back. The head may be red or black. The body is rather sparsely covered with long white hairs.
Damage is caused by the larvae feeding on the leaves. For webworm treatment, Marcum's Nursery recommends Hi-Yield's Malathion, Thuricide (Bt), Spinosad, or Carbaryl, a.k.a. Sevin.
Learn more about webworms by reading OSU's Division of ASNR's article.
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