The easiest way to kill gophers is to find a fresh gopher hole. As soon as you find a gopher hole, take a hose, put it into the hole, and let the hose run for a little while, filling it with water. The gophers will eventually get tired of the water and will move to where it is dry. Another means of killing, or getting rid of gophers involves already chewed gum. Take chewing gum and place it onto their hole as soon as you discover it. This method works because the gophers will attempt to eat the gum and this blocks their digestive systems causing them to eventually die.