You could do an emergency graft on the ringed one if it’s not too big using live bark stripped from a limb.... cover the bare area with the live fresh stripped bark, then cut through the two layers of bark where it overlaps to make a perfect patch, like you would to patch wallpaper. Set the new bark patch aside and pry the injured bark that was underneath to the fresh cut you made, then put the new bark patch into place over the bare wood, seal it up with tar or wax, and cover with tape. Then trim the tree back, hard, and tar the stubs.
That’s an idea - but it’s too late. I already took out the tree. I can get another for cheap in the spring as I have ‘connections’ at Jung’s. ;)
It was a Northwest Greening; I wanted a green apple for pies and to balance out some of our sweeter apples for cider and applesauce.
We’ll be swimming in apples in a few years; our 5 year old trees produced pretty well this season with NO help from me, but I’m going to fertilize and spray (organic) at the proper times this upcoming season.
I may come to regret that, LOL!