There are two plants in the potato bed, one each of Kennebec and Yukon Gold, and they each have one wilted branch. The plants are not next to each other. In fact, they're each close to their respective end of the bed.
They were planted March 12 so they shouldn't be ready to dig until around the end of June. I'm pretty sure the wilt is not the beginning of the usual plant decline before harvest.
Does anyone have any input on what's going on here?