My fruitless mulberry tree has black under its bark on some branches--it's almost powdery to the touch. --Is my tree diseased? Is there something I can do to help it recover?
Certified GKH Gardening Expert
It sounds like sooty canker fungus. This article will help: https://www.gardeningknowhow.com/ornamental/trees/tgen/tree-disease-identification-sooty-canker-fungus.htm