Humane methods of treating a lawn for moles include using a castor oil and dish soap mixture or planting chocolate lilies or garlic to act as a repellent. Harsher methods involve killing the mole with poison bait or spring traps.
Castor oil is a common ingredient in mole repellents. PestKill.org recommends mixing one cup of castor oil with 2 tablespoons of dish soap and spreading it throughout the yard once per month and after it rains as a preventative measure.
Spring traps are the most common types of traps used to kill moles. Moles activate these traps when they attempt to reopen holes patted down by hand.