I finally got my pocket gopher killer working. This is the third version of it, and I believe this one is a keeper. It uses a welding torch handle and some other fittings to put propane and pure O2 down a gopher burrow. Then a spark. The concussion kills them, removes the oxygen, and collapses a good bit of the tunnel. Go to Rodenator.com and look at their videos. Theirs is $1800, and no tanks or regulators.. Mine was from parts I had, and could be built for $50. Tanks and regulators extra, bringing the whole deal to about $500.
Yesterday, I was working in the driveway, and one was shoving dirt out of a mound. Why that cheeky little guy! I went and hooked up the gopher device, and within a few minutes he was in gopher heaven.
I've used poisons, traps, flooding, but this works.
Steve