Bird
Rest in Peace
Hard to eradicate...I would say completely impossible, all one can hope for is a stalemate if one keeps treating the mounds.
Yep, it's been awhile since I read up on Texas A&M's two pronged approach, but basically what they recommended was a bait broadcast on an entire area once or twice a year (I used Logic at the rate of about one pound per acre), then treat individual mounds with a liquid insecticide when they're found (I used to use Diazinon). Now Malathion is my preference. It would appear that I'd have them completely eliminated until the next good rain. After every substantial rain, I'd find about 3 or 4 new mounds per acre and treat each with a gallon of water with an ounce and a half to two ounces of liquid insecticide.
I also read that, by the time a mound surfaces and you see it, it's home to 300,000 fire ants already, and then it grows from there.