Moles can be a big nuisance in a homeowner's lawn. Damage to the lawn can manifest itself in many ways. Mole tunnels that run close to the surface can separate grass roots from the soil causing it to die out. Tunnels can also become more visible in the winter months when the frost heaves the soil where the tunnels are. Moles love grubs and beetle larvae but will eat earthworms too. It is fairly easy to get rid of moles in your lawn with a few instructions.
Construct a mole pit trap. Locate an active mole tunnel, and dig out the soil wide enough to slide a large jar or coffee can into the hole. The top of the jar or can should be level with the bottom of the mole tunnel. Cover the hole with a board. As the mole runs through the tunnel, it will fall into the container. Remove the mole, and set it free elsewhere.
Flood the tunnel with a garden hose. Locate an active mole run, and fill the tunnel with water from a garden hose. Flood the hole periodically until the moles leave.
Get rid of the moles' food source. Since moles eat grubs almost exclusively, apply an insecticide to your lawn that is meant to kill grubs. Bayer makes a decent grub killer that is supposed to kill grubs within 24 hours.
Use a "mole bait." A common brand is Talpirid and has an active ingredient of bromethalin. The mole bait looks and feels like a mole's natural food. Put some in the mole run, and the mole will consume it. It kills the moles within 24 hours.