This might be kind of late but I had the same problem last year with my taters and then over the winter they took the bark off my fig trees. These are voles or what they also call field mice. I would try to keep the taters weeded a little better as I made the same mistake last year and let the weeds run wild in my tater patch. This year I am going to weed better. I also read where you can put a fence up with 1/2 in squares, like a wire mesh. 10 inches above ground and 6 to 10 inches below. I wish you luck with your garden this year. T/C