- Written by Robbi Hoy
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Helpful Tip from the Garden Geeks: Do you have cabbage loopers? If you're growing cabbage, broccoli, cauliflower, or any of their relatives, be prepared to deal with the cabbage looper. The parents of this destructive, little green inchworm are mottled gray moths that winter where it's warm and come north with the spring breezes. When you first spot the moths, install floating row covers to keep them from laying eggs on your plants. Later, you can spray Bacillus thuringiensis (Bt), a bacteria that makes the worms get sick and die. It doesn't harm. Bt doesn't harm natural enemies, like the tachinid fly and parasitic wasp that are the most effective controls of cabbage worms.