Plum Trees
Q.

fruit tree has something growing on bark

Zone 8 | jgunn added on March 26, 2015 | Answered

Its grayish in color. The tree is a yellow plum.

A.
A.Answers to this queston: Add Answer
shelley
Certified GKH Gardening Expert
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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