I don't know about the type of any you are talking about, but my fire ants seemed to thrive off of Quaker Oats.
Take a sharp flat shovel. Shave off the top inch or so of the mound (depending on the size, maybe more. Quickly spray a generous amount of automotive starting fluid (ether) down the tunnels, and quickly drop the shaved dirt back on top, tapping it down with the shovel to seal the fumes in. Seems to work for me.
Fire ants are the scourge of the
earth. I and a friend were on the
back patio tipping a few (small
town in south Texas) and I was
looking for a place to snuff out
a cigarette butt. I punched it
into a nearby fire ant mound. In
typical fire ant fashion, they
attacked the butt with vigor.
The next morning while cleaning
up the back patio, I retrieved
the cigarette butt stuffed in
the mound....the ants were GONE!
I did this on every mound I
discovered in my yard. I’m
guessing they can’t stand
nicotine. (I’ve since quit
smoking, and moved where
there are no fire ants)
Dad and I used to go out with 2 shovels when the fire ants were up in the top of the mound. Each person would take a big scoop and put it on the other mound. Then knock the ants that made it to the handle off.
The invaders rush to kill the queen during the ensuing war.