I give up!
For the last 3 years I have tried to grow runner beans. Each year they fail miserably. I'm not after the rows and rows of 8' tall plants that my dad used to have which gave a colander full of beans per day. I just want a few plants to make it. Year 1 slugs and snails. Last year and this year, millions of black fly. Sacrificial nasturtiums were sacrificed, but it appears not enough! Tried spraying with soap which slowed them down but not stopped them. Have cut the affected leaves off so I can get to the rest of the plant to spray and I think that was the wrong thing to do. It doesn't look too healthy. So, I give up. No runner beans for us.
On a happier note, the peas are doing fabulously this year only inches away from the runner beans!