Potato plants doing well after the blackleg (?) issue

I had pulled the diseased/dead/dying potato stems around June 9th when I first noticed the issue.  So far the remaining stems look fine.  Some of the plants have flopped over, but they aren't wilted and their stems look good, so I think it's just because they're too big.  (Too much nitrogen !?!?  :P)

Potatoes dying from blackleg!!

Out of the blue it seems, several of the potato stems have wilted and flopped over, and their stems near the soil level are all brown and dead!  Both of the "banana" potato pots are affected (those are the new seed potatoes I bought this spring), and it looks like the Bintje potato is following suit as the stems are brown but they haven't wilted/flopped yet.  Google suggests it's blackleg, a bacterial disease.

This is new, never dealt with this before.  Sigh!  I pulled the flopped pieces and put them in the garbage... leaving the rest of the plants intact for now...

I can't find any tips on how to fix it once it happens.