The most effective way to kill the queen is to use a bait. Irresistibly attracted by the bait, worker ants carry it into the mound and feed it to other ants. By the time the delayed-action bait begins to kill ants in the mound, it's been passed to the queen. Field observations by the Texas Extension Service show that the larger the treated area is, the longer it takes for reinfestation to occur. In addition, broadcast applications eradicate new nests before they become visible.
Broadcasting is also more economical and less labor intensive than treating individual mounds.
In response, quail populations and fawn production per doe nearly doubled on treated pastures. Always read and follow label directions.