Couldn't believe my eyes my pots in bags have blight!
guess you got contaminated soil and pots.
It happened to me last year, so at the end of the season I loaded all the tops up and took them to the recycling place. Apparently their composting machines run so hot it kills the spores. My composting skills have never been my strong point ;D
All the best
Sue
PS you are certain it is blight and not a bit of frost damage (hope I am not speaking out of turn to an expert here -especially from your avatar, but forgive me if I am as I am new to the forum)
Are you sure they have blight. It has not really been warm and wet enough.
Can I also suggest frost, maybe ants or AP contamination nstead.
I have received no text message warning of blight conditions.
http://www.potato.org.uk/department/knowledge_transfer/fight_against_blight/index.html?menu_pos=knowledge_transfer
We had something that looked very like blight last year on site and it turned out to be millions of ants.
Sorry about spelling on mobile on the move not driving
Had blight warning 2 weeks ago. Not bags as new and council compost
Early blight I'm guessing rather than late blight. It's not usually a disaster. What variety of potato? Apparently it can be confused for magnesium deficiency with yellowing of the veins. As they're growing in bags maybe feed with some epsom salts just in case.
Thanks for link Digeroo, I've just signed up