Cabbage looper caterpillars get their name from the way they push the center of the body up into a large loop when they move. Full-grown larvae are about 1 inch long. Cabbage looper adults are brown moths that fly at night.
The caterpillars eat holes in the leaves and heads of cabbage, broccoli, brussels sprouts, kale, collard, and kohlrabi.
Do not overwinter in the Midwest. Migrate from the southern states in early summer through September. Pupates on the underside of the leaf in cocoons. There are 2-3 generations in the Midwest.