I'd be interested to know whether people are finding more problems with blackfly than usual this year. All our beans (climbing, French and runner) are covered and some plants have died. I have been spraying with washing-up liquid in water as recommended but it's a losing battle. We've never had a problem on this scale before.
I have been using washing up liquid solution, castile soap and neem oil soution, RHS bug and mildew spray. I think the problem is just too big.
I have a lot of ladybirds, but I think they arrived too lat, and I alwasy seem to find them on other plants (perhaps they are eating other things.) I have a lot of greenfly too, especially on the sweetpeas (which also have powdery mildew.)
I get the odd greenfly - mainly with new growth on clems and sweet peas, but the birds get them.
I live in west central Scotland - not where that photo is...
I think these past 2 years have been bad for black fly. Out Elderflower Tree is covered in them. I blast the affected parts with a hose pipe.