Apple Trees

Question

I have an 8-year-old Gala and Fuji. Both of them are losing the bark on their trunk and branches. There is a black sooty residue on the Gala and some green moss growing on both. I have no idea what to do. Any suggestions would be welcome.

Answer 1

Sounds like one of the two possibilities is likely. These articles should help determine which:
https://www.gardeningknowhow.com/plant-problems/disease/how-to-get-rid-of-sooty-mold.htm
https://www.gardeningknowhow.com/ornamental/trees/tgen/tree-disease-identification-sooty-canker-fungus.htm