We have a very large old piney oak that is in our backyard and is about 50 feet tall. We moved in about 2 years ago and it was beautiful. Now, there is green fungus growing up the bark. Also, some smaller branches have died. We love this tree and don't want to lose it. I was hoping you could give me some idea of how to treat the green fungus.
The fungus you are referring to may actually be Lichens that are growing on the tree. This will not harm the tree if that is the case. Lichens are actually a sign of good air quality. The smaller branches that are dying back may be smaller limbs that are being shaded out by the canopy on the interior. The dying back of small branches is somewhat expected. Needless to say, the best way to answer this question is to look at the tree or see pictures.
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