Voles are destroying my yard and garden. I live next to a vacant lot, and I think that is where they are coming from. I tried live traps, and caught a few, but they mulitply faster than I can catch them, and they do not like the bait in the trap now. I am using a poison bait, but they move to another part of the yard, I cannot keep up. HELP! My plants are being eaten from below, especially day lillies.