Dark discoloration damage on apple limb
I am trying to help a neighbor with helping to save her Fuji. I grafted a Golden Delicious and a Gordon on this particular branch and she hates to lose it. It has a sort of circular dark area that is wrapping around the branch and almost touching itself on the back side. She removed some dead wood in the upper areas that looked like the bark was split open. This darkened area looks as if someone has spilled dark coffee there and it's slightly shrunken in- not flush with the bark on the rest of the branch. She never trained it to a central leader, she has the tree equally divided into 4 branches. I would think just to cut off this bad branch but is the rest of the tree going to go the same way eventually? Can we try to save the grafts by putting them on another of the branches. I don't have the wood to graft again for her later. I would like any suggestions for what this might be and I will go and look at pictures to see if it matches what I saw. She hasn't been home and I can't take pictures until this weekend. What apples there have been have been ok but the branches have been dying off in the upper areas and now this big area of damage at the lower part. It grows next to a telephone pole and earlier last spring the company came and put some preservative around the pole in the soil. They told her it would not get in the apples. I wonder about that. I was thinking it wouldn't be related to the bark damage however.
We are in Sunset Zone 23- Anaheim in CA
Thanks for any ideas you might have.