Q.fruit tree has something growing on bark
Its grayish in color. The tree is a yellow plum.
shelley
Answered on March 26, 2015
It looks like a form of tree lichen. I recommend you read the following article which discusses tree lichen in more detail along with a prescribed course of treatment:
https://www.gardeningknowhow.com/ornamental/fungus-lichen/treatment-tree-lichen.htm
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