Answer: First you need to be sure you have moles and not voles. Moles do not damage plants directly (voles do eat plant roots.) Moles indicate healthy soil and help control certain pests such as slugs and grubs, they also help aerate the soil. They do not need to be controlled unless their tunnels are causing a danger to people. If that is the case, then trapping is the most effective measure. The following web pages discuss control in some detail. You may need to cut and paste the complete url into your browser to make it work correctly.
I hope this helps!
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