Pale green measuring worm with thin white stripes down back and sides. Doubles-up, or loops, when it crawls. Cabbage, lettuce, cauliflower, kohlrabi, collards, brussels sprouts, turnip, mustard, broccoli and kale.
Loopers are hard to kill.
They become a problem in Virginia in late July or early August and remain a problem until a killing frost or light freeze occurs. Throughout United States. Cabbage loopers overwinter as pupae. In spring cabbage looper moths emerge from their cocoons and mate. Eggs are laid during the night on upper leaf surfaces of brassica plants.