It could also be slugs or snails that munch at night, check to see if there is any slime trails. If so, it is those little beasts!
By
10/31/2009
Soft-bodied insects (mites, aphids, mealybugs): Mix one tablespoon canola oil and a few drops of Ivory soap into a quart of water. Shake well and pour into a spray bottle. Spray plant from above down, and from below up to get the underside of the leaves. The oil smothers the insects. Good luck.