I saved a couple of hills of potatoes to dig during winter but found these today:
I guess there must be something underground that eats them. These were deep underground; it wasn't rodents. I found a couple of grubs that I have always thought are June Bug larvae. Quite a few earthworms too. I wonder if earthworms sometimes feast on root crops? I had lots of good potatoes a few months ago, but these have been in the ground for a long time. The solution I think will be to just dig them sooner.
In the past I've had similar damage on root crops if I leave them in the ground a long time. (radishes, beets, turnips) I mean, as you can see, these potatoes are really devastated! I can't believe how much of the tubers are eaten away.