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[–] dr_daniel_jackson 0 points 1 point (+1|-0) ago 

Looks like late blight to me as well. If you're not against using chemical fungicide you can use something like Mancozeb Flowable if you have any other plants to save them, but if its in a pot i would almost discard the dirt and start over, the spores can live for years in the soil. Im battling early blight myself with about 10 potato plants, super frustrating to get a good start and see your work die uncontrollably. =(