Kill fire ant queens and mounds with Ortho Fire Ant Killer Mound Bait. Just sprinkle the bait in a 4-foot diameter around the mound. Fire ants think it's food and bring it back to the mound for feeding. It's a deep-reaching solution that requires no watering. Ortho Fire Ant Killer Mound Bait kills both visible and hidden mounds and prevents mound relocation.