I have a flowering cherry tree which looks like it has peach leaf curl. How should I treat it?

Hi Seedybee, are you sure it isn't just the leaves dying back for winter?

Any chance of a photo of the problem?

It's almost certainly aphids or their after effect that you are seeing. It tends to be only Peaches/Nectarines and the closely related Almond that suffers from the gall making fungus so flowering cherries though related are not normally effected.

The aphids usually curl the leaves towards the end of the current seasons new growth. It is too late to spray too, but the leaves will soon be off anyway.