Can't say it is impossible, but I wouldn't worry about it. Potato plants can look like crap as they age.

The late blight map of reported cases is currently clear, just FYI.

https://usablight.org/map

Agree. Given the leaf roll and that most of the necrosis is on the leaf tips and the yellowing of the leaves - all symptoms of over-watering/overly wet soil - I'd tend to ignore it. That's assuming there are in fact adequate nutrients.

Dave

I third the comments. It looks like you got a real good top growth, but it will have to die down before you dig your spuds anyway. And it is going to look crappy in the process.

Agree. I planted several different varieties of potatoes thanks to a sampler pack from Moose's Tubers. One variety is starting to look awful. It has already bloomed. I have Colorado potato beetles which I try to keep hand picked so I do have some beetle damage but I see none on your plants. This looks like normal aging of plants and they will look worse and worse. I think this is a surprise to new gardeners and it can be confusing since different varieties have different schedules. According to the Farmers Almanac, potato vines usually die by the end of August. Here in NH zone 5-ish, I've dug some new potatoes from a couple of plants that grew from potatoes I missed during harvest last year.

Thanks to all... very helpful. Well hilled, well fertilized, weed free, lots of sun... plants were lush and perfect looking until the decline. I was pretty surprised when 'gorgeous' started to morph into 'crappy'. Always an adventure learning a new crop! I'm thankful Gardenweb accelerates the learning curve... been a boon to my gardening over the past decade!.