Extinguish Plus combines the power of hydramethylnon with an insect growth regulator (IGR) to kill fire ant workers and prevent queens from laying fertile eggs. The result is complete fire ant colony control. Extinguish Plus Fire Ant Bait is best used in the spring or early fall, or whenever fire ants are active. The ants will feed off Extinuish Plus and spread the bait throughout the entire colony, halting the infestation within weeks. Extinguish Fire Ant Bait can be used indoors and outdoors on lawns, pasture land, rangeland, landscaped areas, and golf courses.