Apple tree health
What is happening to my apple tree? What is the dead blackness by these old cuts? Treatment?
Ottawa County Michigan apple diseases
It is literally a fungus growing on the surface of old dead wood. This particular fungus is not causing a disease, it just grows on dead tissue. These branches died back to the trunk after they were cut to stumps. It is not fire blight which kills living tissue and turns it black since these stumps are already dead. just cut the stumps back to the edge of the living bark and that should make the discoloration less apparent. There are several canker diseases that can kill bark and limbs but I do not see any of the typical flaking of the bark.