I have a problem with little piss ants every year. Terro makes a Liquid Ant Bait that is good for all ants. You get 6 bait stations in a box. They're clear flat plastic containers filled with Terro. You snip off a little piece of the station so the ants can get at the bait. They work great outside too, as the rain can't get inside the bait station. I saw a parade of hundreds of ants coming and going from the stations. They work!
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