Moles invade lawns and gardens in search of food (worms etc). They do not damage lawns for fun, they are establishing a set of tunnels to trap worms. Moles dislike noise and vibration and strong smells. Moth balls have been recommended but we have mixed reports about their efficiency. We can treat your lawn to encourage the worms (food source) to borrow deeper and avoid the tunnels. Without a regular supply of worms for food hopefully the moles moves away to hunt for food elsewhere. Traps and poisons are not the answer but profitable for the mole catcher. If you kill one mole in our experience another one replaces it until the food source is gone!