Im pretty sure I have sapwood rot on our apple tree. How do I treat?
Ramsey County Minnesota
If your tree has sapwood rot, there is really no treatment. Try to keep the tree appropriately watered going into winter. Prune out any dead branches. But you should expect to lose the tree. You might want to have a certified arborist look at the tree to decide when and if it becomes a hazard tree:
Sapwood rot is usually characterized by dead branches, holes and cracks in the trunk and mushroom growth on the trunk: