Most Of Leaves And Branches Are Black

Question

The root and branch in ground look fine it’s the branches and leaves that have turned black

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Answer 1

It could be sooty mold, which indicates you have an insect problem such as scale or aphids. They produce honeydew, which can cause the mold.

https://www.gardeningknowhow.com/plant-problems/disease/how-to-get-rid-of-sooty-mold.htm