Diatamaceous earth. Treat the mounds with that. I did that last year, and for the first YEAR ever, have had NO fire ants return. It's a natural, non-poisonous alternative. Treat when you know it won't wash away with rain right away, circle the mound and on top of it. You can get it at most garden centers. I have found it at Lowe's and Home Depot before.
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We have fireants building mounds faster than I can treat them. I know they are hunkering down for either rainy weather or cold weather. Either way the weather is active and so are the critters of habit.
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