Answer: Based on your description, unfortunately, I am not able to determine exactly what is happening to your tree. It might be a case of sunscald damage to the bark, or possibly a disease such as canker, or possibly a combination of factors including poor rooting. Whenever there is extensive bark damage, there is a chance the tree will die and these types of symptoms are very difficult to identify long distance. I would suggest you work with a professionally trained and certified arborist and/or your county extension to obtain a specific diagnosis of the problem, and then based on that, determine how to proceed. I'm sorry I can't be more specific for you.
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