Both our red norland and yukon gem potatoes were affected by whatever this is. Please help us identify the problem, and how to eliminate it for next year?
Your question was an interesting one that sent me on a fairly deep dive. Normally, I would have thought that such damage was due to some sort of disease, but in taking a closer look and viewing lots of sites, it appears that the flea beetle may be the cause. You can find some good photos closely matching the pictures you sent here: Utah Vegetable Production and Pest Management Guide. You will also find an approach for managing them in the Insect management Handbook or in this publication on organic methods of control: Organic Management of Flea Beetles.