Q.Can You Please Tell Me What Is Causing This To My Cotoneaster?
It’s part of my hedge and 20 years old

GKH_Susan
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on March 4, 2022
It looks like lichens, which are often on trees. They are harmless and need no intervention.
https://www.gardeningknowhow.com/ornamental/fungus-lichen/treatment-tree-lichen.htm
Was this answer useful?
00