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in Fruit & veg
Have they flowered and fruited yet?
How old are they?
It could just be the leaves are getting old-you will cut the fruiting branches out once you have picked the fruit anyway-blackberries are tough old things -look how they grow in the wild
I wouldn't be too concerned-perhaps if you could post a picture of the affected leaves?
They will now you have flowers-the fruit will form-it honestly all sounds good -but post a photo then reassurances can be made