Answer: Rabbits are a serious problem and unfortunately it sounds like your trees have been damaged very severely and probably beyond hope. In the future, the best defense is to cage the base of the trees in wire mesh (hardware cloth) keeping the mesh several inches out from the trunk of the tree and running it high enough to protect the trees even if there is deep snow. (The rabbits can sometimes climb on top of snow to reach up into the trees.) Be sure to check the collar to make sure it does not girdle the tree as it grows. I'm sorry about your trees.
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