Well, first of all, stop feeding that groundhog! If he is indeed the culprit he has already interpreted your gesture as "You're welcome to chew here anytime" which, under the circumstances is no longer the case. And even if this critter isn't the same one who is nibbling away at your house, you should still be discouraging him from hanging about.

But if you are a kind-hearted soul who insists on feeding any furry looking creature who ambles your way, you might consider sticking a few cloves of peeled garlic into those apples. It's a bit of a love/hate message to sent its way, but might work. If nothing else, you will have so confused him that he'll spend his evenings trying to analyse your behavior...which will give you the time to try all those other suggestions...;-)

..xx..e