Ants...What I use is water. Boiling hot water. There ain't an ant anywhere can take a couple of gallons of boiling hot water poured down their holes. We USED to have red ants, not quite the same as a fire ant but close. Huge pot, outdoor propane stove. I scouted them out and 23 holes later there's been no red ants around here for years.
Now if I can just get rid of the piss ants, the little tiny ones you only see when they swarm or whatever they call it. Got 2 nests so far this year