Answer: To be honest this does not sound like a home-gardener type of project. Unfortunately, depending on the location and cause of the hole or cavity, there may or may not be a way to save the tree for the long term. The best way to determine if it can be done is to consult with a professionally trained arborist who is up-to-date on current research and methods. Such a professional will do an on-site evaluation and discuss the possible alternatives with you. Good luck with your tree!
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