Blight resistant varieties
A Hungarian family, the Sarvari, developed strains of blight resistant spuds that seem highly resistant.
I've grown Sarpo Mira for two years and, without using fungicides, have avoided blight entirely , quite an achievement when you consider the weather.
They were conventionally developed, by selection, cross-breeding, and testing so they may fall to a later mutation, as they aren't grown on a commercial scale yet and so phytophtera may not have had a "proper go" at them but they work well for me.
Sounds like an ad, but if you grow your own, try them 'cos you know you'll be on holiday when the blight warning is given ;)