Although green like the cabbageworm

, the looper is slightly larger—about 1½ to 2 inches long—with white stripes down its back. Moving relatively quickly, the looper feeds on the underside of brassica leaves, taking large bites as it goes.

Are cabbage loopers harmful?

Crop damage

The larvae eat large holes in the underside of leaves and consume developing cabbage heads. In addition, they leave behind sticky frass, contaminating the plants. They also consume the leaves of a myriad of host plants beyond cabbages. Although it is a damaging pest, the cabbage looper can be tolerated.

Will cabbage worms hurt you?

A small amount of damage from the cabbage worm won't hurt the plant, or your harvest. But if the damage is severe, you will want to take action.