About Fall Webworms
Fall webworm is a defoliating caterpillar found in eastern and central US, from Canada to the Gulf of Mexico. The caterpillar can have either a darkish body with a light stripe down the back or yellow green with a dark stripe down the middle of the back, about 1 inch long and with long, whitish hairs. It commonly attacks birch, cherry, mulberry, alder, willow, cottonwood, and crabapple. The caterpillars live and feed on the foliage inside the tents they make at the branch tips. As they grow, they expand their webs. The webs are unsightly but the actual damage to the tree is usually minimal unless infestation is severe.
Host Trees for Fall Webworm
Crabapple, Birch, Willow, Cottonwood.
Treatments for Fall Webworms
Learn More About Common Tree Pests & Treatments
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