Moles can become pests very quickly in your yard because they often colonize and spread. You start out with one in your grass, and next thing you know there is an entire group of them digging up your plants and ruining your landscape. Moles construct and use a tunnel system to get around underground. If you let the tunnels remain in place, the moles come to think of the area as home and become very difficult to capture or kill. There are several methods to kill moles in your lawn.
Search for mole tunnels. If you see mounds of dirt spread out through your grass, this indicates a tunnel under the ground.
Push the soil to the side and push a long stick into the mound to see if there is an opening underneath. If so, you have found the tunnel.
Put a mole trap in the center of the tunnel so that the mole steps into it and is impaled or choked. Follow the manufacturer's instructions for setting it up.
Use a poison to kill moles if your state doesn't permit the use of deadly traps. Put out poisoned bait that looks like earthworms. Each bait worm contains bromethalin, which kills moles within one day. Because poisons can be prohibited, check with authorities, such as the Department of Wildlife.
Create a concoction to poison the mole. Mix 1 oz. of castor oil with 1 cup of Murphy's Oil Soap and 1/4 cup of cayenne pepper. Add it to water to formulate a 2-1 mixture. Spray the mixture along the travel route of the mole, or pour it directly into the pest's tunnel.