Every year, my runner beans get attacked by aphids. I don't use chemicals, so I try washing them off, or squeezing/scraping them off with my fingers
This year I thought I would try buying some ladybirds, to see if they have an effect.
They turn up in in a plastic box full of Cherios that both protects them, and acts as food.
I'll tell you in a month or so if this solution works...