This is our first year growing potatoes (no potatoes or cultivated nightshades have been grown in this soil for at least 2 years before). Central NY zone 4b/5a. The potato plants started out healthy, green, and thriving, but have since stopped growing. The leaves are curling and turning brown. (And there's some flea beetle type damage which I expected and I don't think is the main problem.)
What could be wrong with our potatoes? What should we do about it?