crabapple losing bark-- possibly dead
I have a 9 year old Prairiefire crab that was just getting to be beautiful in the spring. I just noticed that the bark is falling off in many places and all around the circumf. I don't see insects and am not sure what might have caused it. I did not wrap the tree this winter because it was old enough I thought. I pruned a couple branches and they were dry. What do you think it might be and are other trees in danger?