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Just use old fashioned lye, the kind granny used to make soap. Put a teaspoon into the mole trench every few feet. This stuff irritate their feet and when they try to lick the stuf off, they get poisoned.
I just use an old lawn mower with a hose attached to it and stuck into one of the holes and then sealed with dirt. Let it run for 30 minutes or so and then seal the hole up. But, I really really like the gas and leaf blower better. That way you at least know that something has happened and that you, even if you did not get him, scared the crap out of him or her.
This is what I did ONCE and I highly DO NOT recommend doing it.
I poured about a half cup of gas down the hole, then stuck a leaf blower in there to circulate the fumes…than dropped a match and all hell broke loose. Blew that smoking little furry thing out his escape hatch and about 12 feet in to the air along with a 12 foot coulomb of flames. The ground I was standing on rose, it felt like, a few inches. I think if I was closer to the house it would have blown a few basement blocks in. Needless to say the furry little creature didn’t survive.
Sounds like Cady Shack, also sounds like your a few cards short of a full deck. Dame varmit cong........