I Noticed Some Grey Areas On The Branches Of My Magnolia Tree (see Picture), What Is It?
I would like to know if something is wrong with the tree, thanks in advance, Daniele
Certified GKH Gardening Expert
These lichens don't cause issues, themselves. They can indicate that a tree has some sort of infection, and in some cases can be normal.
From this photo, I cannot tell which is the case.
If the rest of the tree is fine, and this is the only concern, then I wouldn't worry. If the tree seems to be lacking in health, then it will be necessary to check for pest or fungal/bacterial infections.
This article will explain how to get rid of it, if you choose to do so: https://www.gardeningknowhow.com/ornamental/fungus-lichen/treatment-tree-lichen.htm