There are many plants in the cabbage family, they include broccoli, brussels sprouts, cauliflower, chinese cabbage, collards, kale, kohlrabi and of course the common cabbage.
Cabbage worms attack all members of the cabbage family, as well as lettuce.
Cabbageworms come in two varieties. They are either trichoplusia ni, cabbage loopers or they are imported cabbage worms, pieris rapae. Typically, infestations of either sort of cabbageworm will present itseld in the form of irregular roundish holes in the leaves. After noticing the holes, you may also see green worms which can grow in size up to 1.5 inches long and usually the cabbageworms have lighter green or white stripes down the center of their backs. You may also note large clump of green or brown pellets among and on the leaves, where the cabbageworms have left excrement in the wake of their feeding on the leaves and heads of the plants.