[VeggieVirgin]

I bought a runner bean plant in early June. It sulked all summer, producing flowers but no beans. Finally, in the past three weeks or so, it relented and started grudgingly putting out a few beans, but now something is eating its leaves: some leaves have been completely munched; others have been partly nibbled, but when I examine them, I can't see any beasties at all.

Any ideas?

[Yorkie]

My first culprit would be slugs / snails, even if you can't see them

[sunshineband]

Check for slime

slime = slugs or snails 

check for squarish, blackish green droppings (frass)

frass = caterpillars 

[mumofstig]

I found loads of baby snails munching on the pods I was saving for next year.
They may be little but they can't half climb (and eat )

[sunshineband]

I found loads of baby snails munching on the pods I was saving for next year.
They may be little but they can't half climb (and eat )

They eat out of all proportion to their size, don't they?