Hi all. Just this past week I've noticed a black indentation on a young branch of my Italian prune. It has a hard shellac type 'black' glass-like coating. Looked it up and looks like bacterial canker. I have researched the web to find out there is such a thing as 'canker' paint. Cannot find a product name for it. Also, I already thought all of the sprays I use would prevent anything like bacterial canker, but I guess it hasn't. My current list of sprays:
Monterey Fungi Fighter
Superior oil dormant spray & neem oil
Thanks for your help as always, Mrs. G ps. tend on pruning off that thin branch asap.