I know that this might seem like a joke, but I've seen reference to
chewing gum, chewed, in big wads thrown down the hole....
I've tried fish/seaweed spray
blood meal/tobacco dust
electric fence
traps
.22 Magnum
If that's not integrated pest managment, I don't know what is....
JR
John Rowland R Farm
You R what U eat. Weaverville, NC