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New, more expensive gel and granular baits may be needed for large, stubborn infestations however. Ant Control Suggestions – general information about ant control in homes. House Ants – basic information about the ants that invade homes. Baits are made from some type of sugar and this slow-acting insecticide. Ants that can be managed with these simple baits are odorous house ant, Argentine ant, pharaoh ant, pavement ant and a few others so long as the infestation is not too large. Some species, however, such as carpenter ants, fire ants and harvester ants must be managed in other ways, see the Index for control of these other ants.
Worker ants feeding on liquid ant bait. Ants consume bait and take it back to their nest where it disrupts the colony. After a few days you can replace this with bait that has insecticide in it. A small amount of vegetable oil can be added to the syrup for times when ants seems to be more interested in fats than sugars. If ants seem to be ignoring the bait try adding a little vegetable oil.
See How To Control Nuisance Ants for more suggestions regarding using baits to control ants. While these new baits are relatively expensive they are vastly superior to simple borate baits for tough infestations. Gel baits come in tubes that are squeezed out with a plunger into individual bait placements. Since the gel can be a bit messy gel baits are also packaged in individual bait stations at a somewhat higher cost.
Place baits near ant activity, do not contaminate area with insecticide. If ants appear to be feeding on bait, as in photo above, replace plain bait with one laced with insecticide. For small infestations use ready-made, or home-made, liquid boric acid baits. Replace individual stations when they are exhausted or completely consumed.