Posted: 04/05/2017 at 21:17
I don't mind which way up the image is, I can turn the screen upside down , I wanted to see the shape of the leaves. I think it might be an echium. How big is it?
Remove those distorted non fruit and dispose of them. It's not a cure but gets some of the spores out of the way. It's a fungal thing but nothing to treat it with as far as I know. I think the proper plums are safe at this stage, they won't be affected now.