08/29/2023
The fall webworm is a native moth of North America and is commonly found throughout Missouri during late summer and early fall. As their name suggests, the caterpillars of the moth spin webbed nests that cover the ends of tree branches, providing protection as they consume foliage. Dozens of caterpillars can be found in a single nest, and you may see webbing covering multiple branches and occasionally an entire tree. Fall webworms are not picky eaters. Their webs can be found on a variety of hardwood trees such as hickory, walnut, birch, cherry, and persimmon. While often considered a pest, the webbing and defoliation caused by fall webworms is mostly an aesthetic issue that rarely causes long-term damage to trees. If control is necessary, an effective method is to rip open webs to expose caterpillars to natural predators by using a long stick with a nail driven through the end. Some insecticides are labeled for fall webworm control, but since this insect is rarely a tree health issue, and insecticides can harm beneficial insects, MDC recommends avoiding chemical control. Never use fire to burn webs from trees as this can damage twigs and buds.