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Doesn't work reliably against Argentine ants; they form supercolonies so even if you take out one or two queens, it may not be enough.

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AFAIK, it's still the best way, but it's not the near 100% knockout it can be against other ant species.

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Only thing I’ve had that worked against argentine ants was termidor sc. Non repellent, and slow kill time. Spray it on an active walkway, and it will slowly spread through the colony and kill them all off. Again, supercolonies, so it isn’t a perfect solution. But it’s the only thing that works for me for 6+ months at a time. Then, I have to spray again as soon as I see another Argentine.

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