It's potato blight weather this week in the Emerald Isle.
My cheap Homeguard seed potatoes from the discount supermarket do not appear to be blight resistant. Next year I will grow the Hungarian Sarpo Mira blight resistant seed potatoes again.
Being organic gardeners we don't use chemicals. This is what we did on inspection of the blighted haulms before and after:
Yellowy turning black foliage. I wore a pair of gloves and cut off the foliage with a pair of garden secateurs and piled it in a heap and covered it with grass and weeds.
Foliage removed.