I have a 20-year-old tree in my front yard with a large blackening branch, green flaky material covering many branches, and branches dying off annually. What could be the cause?
It is hard to say what is causing the limb to turn black. If it is dead, it could be decay. If it is still alive, there may be insect activity that is causing sooty mold to form. The green flaky material on the bark sounds like Lichen. This organism usually does not cause any major health issues.
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