What happened to my potatoes?

A:

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.

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