We hatessssss moles, and gophers, and voles

As a Master Gardener through Oregon State University, we get a lot of questions about vertebrate pests. Sadly I too have problems with gophers, moles, and voles. We were at our wits end trying the various devices but during my Master Gardener training, I learned that traps and poison are the most effective methods for minimizing damage to your crops and property. Sometimes the effective poisons are limited to licensed operators. You can check with your local extension office for their advice on what works in your area.

There has been a lot of research done through the various extension services and the ultrasonic or other vibration devices don't seem to work. Gas bombs only work if the soil is heavy enough, and the burrows not large enough to dilute the smoke (so it doesnt get to high enough levels to kill them).

Before I did the Master Gardener program, we had tried various baits, bombs, vibration devices, setting sulfur on fire, and flooding. Now my husband traps them, with reasonable success as long as he does it all the time. Thats the problem for us as he already has a full time job! It does seem to keep them more under control, but its an uphill battle.

Here is some info from Oregon that you may find helpful:
http://extension.oregonstate.edu/catalog/html/ec/ec1117/
http://extension.oregonstate.edu/catalog/html/ec/ec987/