Remember the saying about "the meek shall inherit the Earth?" I think they meant those crazy ants! Here, we're calling them Caribbean Crazy Ants because we just like to blame every imported pest on the Caribbean. I don't know what the entomological name of our strain is, but you sure don't want them!
I have two ant bait stations that hold a cup of ant bait each. I think it's called a K&M Ant Pro and they make what they call "gourmet ant bait" for them. So far, they work great on the little black sugar ants we have in fair numbers. Have not yet had the 'big invasion' of crazy ants, but as you say it's probably only a matter of time.
We had a wonderful entomologist we called "Dr. Fred" here at our Extension office until a couple of years ago. He was like a little kid that just loved to talk about bugs, and used to give a terrific ant seminar a couple of times a year. He says some ants will always take sweet bait, and some ants change their diet according to the season. No matter, though, you must find what bait they will take back to the nest to effectively control them. Just killing the trails of ants you see won't work. In fact, as I recall he said that can make matters worse, as the ants then perceive a dangerous area, create a new queen and new nests in another area. It's called 'budding'.
So don't just spray and pour boiling water to kill the ones you see, Bait! Bait! Bait!
He also said that Terro sweet bait is 'way too strong, the ants die before they can get back to the nest with it. You need to cut it by 4 parts distilled* or bottled water to 1 part Terro so they can survive to get it home. *the ants can taste the chlorine in tap water
