Bengal Gold Roach spray takes our technology a step further. Through the use of an Insect Growth Regulator (IGR), the long-term effectiveness of the product is increased. The IGR breaks the life cycle by sterilizing adult cockroaches - makes them unable to reproduce. It prevents immature roaches from developing into breeding adults. Birth control for roaches! Cockroaches that have been affected by the IGR will sometimes be mutated and have twisted or bent wings. These roaches are sterile. If you see these roaches, it is evidence the product is working and has sterilized the pests.