I have an infestation of voles. They burrow into my raised beds and have young. I have holes everywhere. I've tried baited mouse traps, gum, rat traps, catnip (to draw cats), and those noise zappers. Nothing works. They keep on eating my root crops (beets, parsnips, and sweet potatoes) from the ground to the leaves. Does anyone out there know how to get rid of voles?