Quaking Aspen Bark Fungus
Our quaking aspens have developed a coated fungus looking stuff on the bark, then they get the branch completely full of this. It is a grey looking matter, then the leaves die and they fall off. It has spread to the other aspens around it. Is there any treatment for this, or do they need to be cut down?
Certified GKH Gardening Expert
The following article should be of some help to you: https://www.gardeningknowhow.com/ornamental/trees/tgen/tree-disease-identification-sooty-canker-fungus.htm