Tunnel Fill

Gophers - Although the most expensive way to control gophers it has long term benifits because it destroys the tunnels at the same time as it flushes the gophers out of their tunnels. You must use this product early in the morning as close to sun up as possible to have good success rates because that is when the gophers tunnels are not plugged

http://www.gopherandmoleproducts.com/Tunnel_Fill.html