Maple Trees
Q.

Maple tree bark fungus

Zone Plymouth Wisconsin | Anonymous added on May 16, 2019 | Answered

We have a newly planted Maple tree. It has light green patches on the bark. They are easily scratched off. The patches have small round cells in it. They are about 1/32" round. What is this? Is it harmful? And how to treat it if it is harmful? Can you reply to Oakhaus3@hotmail.com

A.
A.Answers to this queston: Add Answer
Downtoearthdigs
Certified GKH Gardening Expert
Answered on May 17, 2019

This could be something as simple a lichen forming on the trunk or more serious diseases.
These articles address these issue. You may need to do some further inspections of the tree; the trunk and leaves to help may a correct identification and then how to treat the issue.

https://www.gardeningknowhow.com/ornamental/trees/maple/maple-tree-bark-disease.htm
https://www.gardeningknowhow.com/ornamental/fungus-lichen/treatment-tree-lichen.htm

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