Posted: 05/09/2015 at 08:42
Sounds like caterpillars. Bob's right, they're nocturnal. Go out at night with a torch and examine all over the plant, especially underneath the leaves. Pick them off and squish 'em. An excellent organic spray against caterpillars and their ilk is DiPel, derived from Bacillus thuringiensis, a naturally-occurring soil bacteria. You just have to remember to spray both sides of the leaves.