Extinguish Plus Fire Ant Baits are most effective when used during the spring or early fall. This product is a long lasting fire ant control bait that kills the worker ants and sterilizes the queen ants. The Extinguish Plus Fire Ant Bait also prevents reproduction from occurring in the colony; for it contains an insect growth regulator (IGR). The ants will feed off Extinuish Plus and spread the bait throughout the entire colony, shrinking the infestation within weeks. Extinguish Fire Ant Baits can be conveniently used indoors and outdoors on lawns, pasture land, golf courses, landscaped areas, and range land.