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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.
Try Taphrina pruni,
Thanks. Aside from the mention of swelling on one side (which I haven't seen in dozens of affected fruits), the Wikipedia description of this sounded very much like the problem I've got. The RHS (whose site I finally remembered to check specifically) only called this 'pocket plum' - confusingly different from the American 'plum pockets' apparently caused by Taphrina communis. Clearly it's a developing science!