I’d say take @Cthulhu 's advice and improve the overall vigor of the tree. A good mulching of wood chips at the drip line is a great idea and extra food and water wouldn’t hurt. Get that tree stronk and it’ll probably be able to live with the bacteria cause there’s really no treatments for it. Most I’ve seen for suggestions is pruning and that’s more than likely gonna spread the bacteria to more plants or more spots on your tree.
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