The wider the buffer strip, the less likely voles will cross it into the garden area. Frequent tillage in the garden removes cover, destroys existing runways or tunnels, and will eliminate a high percentage of the existing population. Several effective baits have been developed for vole control, usually labeled for noncrop areas. Bury the bottom edge 6 to 10 inches to prevent voles from digging beneath the barrier. Place the trap perpendicular to the runway with the trigger end in the runway.
Apple slices or a peanut butter-oatmeal mixture make good baits.
In general, fumigants are not effective due to the complexity and shallowness of the tunnel systems. Repellents and frightening agents have not proven effective, either. A section of roofing shingle placed over the burrow opening and baited with an apple slice will attract voles. A trap can also be placed under this shingle, because voles are readily attracted to shingles or pieces of plywood placed on the ground. Shingles should be bent to form an A-shaped roof.