This small bowl contains three cotton balls, laced with my homemade ant bait-poison. You can see some black ants on those cotton balls, and I am sure that some ants have returned to their nest to be eaten by the queen, thereby destroying the colony.
RECIPE FOR ANT BAIT-POISON
1 cup of water
6 tablespoons of white sugar
1/2 teaspoon of boric acid (purchased at the pharmacy; not on the shelf in a store)
Mix thoroughly. Place 3 cotton balls in a small bowl (or more bowls). Pour enough poison over the balls to saturate them. Place the bowl in the area where you have seen ants, and leave it there for 3-4 days. Do not move the bowl, because you might chase the ants away. When the balls start to dry out, discard them.
Throw out the leftover poison, if any. It is best to make a fresh batch each time you have an ant problem.