I'm so angry I could spit tacks! Those blankety blank rabbits have completly girdled my Dwarf Courtland apple tree. It is 8 years old! I've never had them mess with a mature tree before. I have always protected the trunks for about 4 years, then don't bother any more. I'm sure it will die, as they have chewed all of the bark down to the wood all the way around the tree.