Mimosa webworms are gray to brown caterpillars with 5 thin stripes running the length of the body. Mature larvae are just over 0.5 inches long. The first generation is active from early to mid-June; a second generation feeds from mid-July to mid-August. The larvae feed on the surface of the foliage and use silk to web leaves together at the ends of branches. Infestations are unattractive but rarely affect tree health. This insect spends the winter as a cocoon-encased pupa in bark crevices or leaf litter.