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...horrid biting little monsters.
You kill fire ants with Amdro. Every single time it works. Takes about a tablespoon of granules sprinkled about 8" from the opening. They see it as food, feed the queen, and the whole mound is dead the next day.
My only issue with Amdro is how effective it is. You can track the demise of the Horned Frog with the advent of Amdro. It kills their food source. So keep that in mind, fellow Texans, and only kill ants that threaten you. Leave the pastureland alone.