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The fall webworm feeds on many hardwood trees throughout the United States but is not considered a major pest in most areas. The web or tents that the caterpillars build in trees is considered unattractive by many people. In Florida, the fall webworm is common and can cause serious damage to commercial pecan groves. In the spring, the female webworm moths lay egg masses with 400 to 500 eggs on the underside of leaves in the host tree. The female covers the egg mass with white hairs. After one to two weeks, the larvae hatch and immediately start to eat surrounding |
 Webbing/tent from fall webworm Photo credit: G. K. Douce - University of Georgia |
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leaves and begin to build their web-like nests in the trees. For four to eight weeks, the larvae continue to devour leaves and expand their webs. Eventually, the larvae spin a cocoon, usually on the ground near the tree, where they stay throughout the winter. This cycle can be repeated several times in one growing season. The following spring the moths emerge and mate to start the cycle over again. |
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The major evidence of attack is the large silken web built by the larvae. These webs are located at the end of branches. The leaves within the webs will have been eaten by the caterpillars and will have a skeletonized appearance. |
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Many caterpillars can be found living in the tent. Full-grown caterpillars are 1" to 11/4" long and covered with silky hairs. Their body color can be yellow, green, gray, brown, and black usually with orange, yellow, or black spots or stripes. There are two varieties of fall webworm, one variety has a black-colored head and the other has a red-colored head. |
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Fall webworm can feed on many species of hardwood trees, but in Florida this insect seems to prefer persimmons, hickories, sweetgums, and pecans. |
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Photos Click on thumbnails to see a larger image in a new window. Close the new window to return to this page. |
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 Larva Photo: J. B. Hanson - USDA Forest Service |
 Larvae Photo: Clemson Univ. Entomology Dept. |
 Trees with large tents/webs Photo: USDA Forest Service |
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| [Forest Health] |
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