Large mounds of soil throughout a lawn are a telltale sign of mole activity. These tunnels put a blemish on a perfect lawn, while the pests that created them bring havoc to plants and landscaping. They do not feed on the plants in your lawn, but they uproot flowers and damage the lawn bed. Moles feed on the grubs and worms that live in the soil, causing them to tunnel around a large space to forage. These pests are usually small, measuring 4 to 8 inches in length, but have strong shoulders that make burrowing easy.
Call your local extension service to determine if killing the moles is legal in your area. Adhere to the state or local ordinances against exterminating these pests if it is prohibited where you live.
Locate the active tunnels in the lawn by stomping on a section of a tunnel with your foot. Stamp the tunnel closed and leave the area alone for 24 to 48 hours. Examine it after the time period has elapsed. If the tunnel is repaired, it is an active tunnel, and treatment can begin at the entrance of this tunnel.
Follow the tunnel to locate the entrance--where the moles are entering the tunnel.
Position mole bait containing bromethalin into the entrance of the tunnel. The bait smells and appears like the grubs and worms that moles thrive on, enticing the moles to consume it.
Put new bait into the tunnel entrance each day, until the bait is no longer being eaten. Stomp on a section of the tunnel near the entrance and wait for 24 to 48 hours. Re-examine the tunnel. If the tunnel has not been repaired, the moles have been eliminated.
Roll the tunnels flat in the lawn with a lawn roller attachment on your mower. Follow the manufacturer's directions to carry out the use of the roller.