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Most likely cabbage moth caterpillars, or it could be slugs and snails. Go out at night and inspect with a flashlight.

Thanks, had problems with slugs on green beans a couple weeks ago.
If it's the moth caterpillars, what kills them?

I had a similar problem a few weeks back. I hand picked all the little worms off (yuck) and then covered up with row covers and they seem to be all gone.

I think you can also use some sprays - BT I think is what was suggested to me. I'm sure someone more experienced on here can verify.

It's cabbage worms. They are little green caterpillars that are hard to see on the plant if you just glance over it. You'll find them if you look. BT is best to use for control when the caterpillars are young. Wasps are good natural predators and hand picking helps. Row covers or tulle works to keep the adults from laying eggs in the first place but they won't work if you already have them on your plants (unless you get rid of them first before covering).

Rodney

This post was edited by theforgottenone1013 on Mon, Jun 23, 14 at 16:44