Webworms are caterpillars that weave loose webs around a tree’s foliage to munch on leaves. They cocoon in the winter and in the spring, emerge as adults and populate eggs, resulting in numerous caterpillar-filled webs in a single tree. Managing webworms may be difficult due to their large numbers and the variety of trees they inhabit. Let Pest Patrol determine the best treatment for eliminating your webworms.