Funny beans

I'm concerned about my broadbeans. I have pulled up 2 plants as the leaves have all died and look like they have a disease. I've gone through all my books and can't fathom out why they look burnt. There is zero blackfly on them so it can't be that. Funnily enough the pods aren't affected so I really am at a loss to figure out why they look so dead! It's a mystery!




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