This has only been happening for the past 3-4 days. Started at the bottom of the plant, working it's way up. Started about the same time as the plant started flowering/growing mangetout.
It's not sunburn because we've had quite a bit of rain in the past few days - but that also means that the humidity has been higher than they are used to. Fertilised a couple of days ago, PH is spot on 5.
Any ideas?
