OL,
If not much of your leaves have been eaten, don't even bother to treat the plant. As long as your plant is healthy and has lots of leaf area left let whatever is eating it have some. Just watch that it doesn't start doing too much damage.
Bacillus thuringinsis (BT) will kill caterpillars, other stuff won't.
My daughter raised a Sphinx moth from caterpillar to pupa to moth once. Very cool!
Enjoy!
Thanks Rita, it might be Japanese beetles..I've found a few on the bush. I'll leave them alone for now. It's not too bad. My little friends have not been back since Sunday. Did your daughter raise her moth for a school project? My son would love that. They raised some sort of icky beetle last year. I think they started out with mealworms.