I had this on my French beans this year. Not sure what it is but they weren’t very vigorous plants anyway so I pulled them out and started again with a more vigorous variety. I had this last year (different area though) and didn’t seem to affect the crop. Maybe someone else on here can shed a little more light?
Are there any sap sucking insects like aphids on the underside of the leaves? They would weaken the plant but as you already have flowers I would leave them and just hope for some crop. I think it too late to start now from beans. Does anyone else on the allotment have a problem as well?
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