Spray that tree with 2 tablespoon dawn and some hot sauce.about 5 to 8 drops...in 1 qt container and spray it good..............wait until you see this spring into june............if it does not show prebuds.............I is probably gone................If you plant another one you will have to put a fence around it and 2 stakes to keep it in place. We have the same problem up here. Deer even stand on their back feet to reach up high and pull branches down.