Take control of fire ants with Amdro Fire Ant Killer for Mounds. This dual action formula contains bait to attract fire ants and starts to kill ants immediately. These granules are ideal for mound treatment and are an easy & effective way to control fire ants. The worker ants carry it into the mound as food for the colony. They eat it and feed it to the queen. In about a week, the queen is dead, which destroys the mound. Also effective against bigheaded ants and harvester ants.