I've had good results with liquid ant bait. From www.gardensalive.com

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Christopher A. Young
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"Molly Brown" wrote in message
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First I would see what the ants were coming to then I would take it
away and put Grants ant traps in it's place. The ants would eat the
poison and die off in a few days. Now they still eat the poison but I
think they developed an immunity to it because they're not dying
anymore. Anyone else have the same problem? Maybe if I injected some
kind of poison through a long thin tube directly into their nest. Any
ideas?