Gophers, on the other hand, do plenty of damage. A mole hill is circular, its entrance hole in the center.
Moles dig near the surface, so their tunnels are easy to spot.
A gopher mound is fan-shaped and its hole is off center. The gopher digs deeply, so their tunnels are rarely visible. One of the oldest mole repellants is a dilute spray of castor oil and water. So unless you've had a lot of rain, you need to apply it only every month or so. Bacterial sprays and select strains of microscopic worms called nematodes kill the grubs that moles eat while not harming other soil inhabitants.