I am not a tree expert, but I have 5 acres around my house with primarily post oaks and cedar elms. I have also had a similar problem to you on a few trees, primarily where I have made changes (grass, flatwork, etc). My experience is, if the tree is dropping the leaves, that is a good sign -- I was told that it means stress, not death. When this has happened, I applied the sick tree treatment and the trees came back the next year -- strong. Where I have had more problems is when the leaves turn brown and don't drop -- I havn't been able to revive those yet... soon after, the bark starts coming off.
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