Q.What Is The Cause Of This Damage
This is my friends London plane. It is suffering sparse foliage but the thing I’m puzzled by is the damage to the trunk and bark. This photo is one metre up the trunk. I can’t decide if it’s wilt, anthracnose, a borer pest or massaria. Can you help?
Certified GKH Gardening Expert
That is classic tree borer damage! This article will help: