Hi everyone best easy and really inexpensive way to et rid of goffers. Get a big pack of juicy fruit stick gum put one in each hole and make sure you cover it back up with the same dirt. Leave it or a day or so u can look back in the hole and you will see its dead a Gardner of mine told me about it I thought he was crazy but it actually worked and I had tons of holes thought my yard an had tried a lot of products from home depot and lowes and nothing worked untill this. Hope this helps you.
Another good followup to this technique is to put the dead gopher into any other hole that still has activity and cover it up. It will drive out the other gophers. For lawn gophers another way to kill them is to look for movement just below the grass and whack that spot with a shovel.
None of these techniques, including the Juicy Fruit gum, will completely rid your lawn of gophers forever, however. They will be back, so you have to stay vigilant.
I've wondered why people want to kill gophers, but reading your question and comments, Patience, I see it may mainly be because they make holes in the lawn. I can understand wanting to keep the lawn nice, but not by killing the gophers. In Southern Saskatchewan where I have relatives, there are hundreds of gopher holes in the school yards. I can see the problem with that -- little children can break a leg while running around the school grounds. But at the school I inquired at, none had. Yet the school powers-that-be fill every gopher hole religiously and often.