Answer: Sorry my reply is tardy! I hope you still have some fruit on the canes! Like bees, ants have a nest with a queen, so they are likely taking in the juice and travelling back to the colony. You can catch them by ringing the base of the canes with Tangletrap. This sticky stuff gets them, coming or going. You should check it regularly, and put more on if the tangletrap gets so "crowded" that it can't catch more ants. You will inevitably get this nasty stuff on your skin -- use baby oil or mineral oil to remove it.
I also suggest boric acid baits to get to the heart of the colony. Best of luck!
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