I use the caps from the putified water garafones with a ratio of approximately 1 boric acid to 5 sugars (I've read recipes using 3-10 times the amount of sugar). I DON'T ADD ANY WATER. I tried in the past adding water to the mix, but found this works way better. Might take a few minutes for the ants to find it, but they will and hopefully will take it back to their nest where it will ultimately kill the queen.
All my trees have lots of ants going up and down. Not so good for the fruit trees. I put one of those at the base of the tree, where usually there's a nest. Depending on the number of ants, the mi.x can be gone in as little as a day. If it's in a humid place you can cover it with a can, otherwise with the humidity it can get hard.
Good luck!
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