Amdro Granular Ant Bait is effective against specific destructive ant species, namely Singapore ant, Coastal Brown ant, Tropical Fire ant (Ginger ant), Red Imported Fire ant and Green Headed ant. It works by attracting worker ants from target species to its palatable bait matrix. The worker ants then carry Amdro back to the nest and it is consumed by the queen to achieve total colony elimination. No queen, no colony.