Weirdly withering plums
Many of the ripening plums on my tree have been withering - discoloured (pale and mottled) and shrivelled, lengthening until they almost resemble laburnum pods. Yet their neighbours appear fine. The symptoms don't fit those of any disease of plum trees that I can find online.
Any ideas for what's causing this and how to treat/stop it? This was the first good crop the tree's had for some years.