Yep, works with squash too...anything with a prickly vine, they hate to step on them. For woodchucks, pour used kitty litter down the hole and they vamoose.
More on the subject of nuts, yes, hazelnuts are good, I like because you can keep them trimmed down to bushes making harvest easy. Yes you need a male as well as females, and yes, it takes quite a few years to get any nuts. That is why I insist at our new place that M can't cut down the nut trees here - we have what looks like hickory and pecan nut trees, already bearing judging from the nuts on the ground, but I have to wait for spring to know for sure - identification of trees by bark is hard for me. She can take down the gum trees though, have not yet found any use for them. Anybody know of a use for gum trees outside of firewood?