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Spring webworm and fall webworm larvae form a web that can cover individual leaves, leaf clusters or whole branches, growing to several feet in diameter. Larvae grow to about 1 inch long, with pale yellow or greenish bodies marked with a broad mottled stripe containing 2 rows of black tubercles down the back. They are covered with tufts of long whitish hairs. Adults are mostly white with dark spots on the wings.
Larvae produce loose webbing around leaves and branches; larval hairs may cause skin irritation. Larvae will feed on leaves of a large number of tree species. Webworms can appear as early as April in south Texas. However, the last generation is the most damaging.
Over winters as pupae in a silken cocoon in leaf litter or in cracks on rough bark. Adults emerge in spring. Oviposit eggs in masses on leaf undersides that appear covered with hair. First instars begin feeding on leaves, spinning silken webs enveloping their feeding sites. There can be up to eleven instars. Two to 4 generations occur per year, depending on locality.

Step One
Cut off branches infested with webworms and throw the branches in the trash. For trees that are not tall or overly infested, this a good method of removing the nests
Step Two
Spray with a chemical agent like Drusban or Diazanon. Open the nest and spray until thoroughly damp. Also, spray the area and leaves around the nest.
Step Three
Open the nests with a stick and let birds clean up the problem for you. Birds will eat the webworms once you open the nests

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