About an inch long, this leaf-feeding pest is a long-haired, pale green or yellow caterpillar with a black stripe down its back. It feeds from inside the silken, web-like nests it builds at branch tips.
Target: Fruit, nut, and shade trees; roses and other ornamental shrubs.
Damage: Leaves are chewed; individual branches and sometimes entire plants are defoliated. Plants are covered with dirty white webbing.
Life cycle: White moths lay woolly egg masses on leaf undersides. After feeding, the caterpillars crawl down the trunk to pupae; pupate overwinter in litter or attached to tree bark. There are up to four generations a year.
Notes: Use a long pole to destroy webs. When spraying, poke the sprayer through webs to get to the leaves the caterpillars are eating. Tent caterpillars are similar pests.