I need help identifying what's going on with my dwarf apple tree. I have several of them in huge above-ground pots - two that are a few years old and a few that were only planted from bare root this spring. While working out of the country for a couple months, the person watching my house let me know the leaves on the new pink lady tree were starting to look like they had brown stains. The progression was curling and then the leaves would die. I asked her to move the tree away from the others but I was unable to provide proper treatment
I know I've lost the tree at this point, but I want to identify what this is. Our weather has been extremely warm since late spring. And very windy. I have one other new tree that is starting to show the same signs but hasn't progressed. I want to figure out what it is so I can treat it. In the meantime, I've also moved it away from the others. Is this a fire blight issue? I've never actually seen fire blight before. I'm in Southern CA. Any help or recommendations would be much appreciated!