Not a pro. but

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Raid is not enough. You need a fire ant killer that is like a bait that is taken to the center and kills the queen, as the story goes.

You most of the time only make the colony move over to the neighbors anyway. They are hard to kill, sometimes you just move them away.

But for sure Raid will not do it.

Amdro, or a fire ant drench, or something like that.