Black Knot in Burbank Plum?
I planted this potted Burbank Plum from a nursery end of season sale last fall (not the best choice i know) It seems to be doing ok, but is growing fairly slow, about 8" of growth at each tip this year, in comparision to a Shiro planted at the same time which put on about 15" of growth this year. They are in the same approximate locations. Considering the very mild winter here last year (-20C max for a very brief spell), i dont think it suffered winter damage. My concern is a black spungy growth? located at the graft union i found today. It dosn't really look like the pictures of black knot i found on the internet. Am I paranoid, or if it is black knot, what can i do about it at that location? My understanding was that Burbank was fairly resistant to black knot.