Gentrol aerosol is an I.G.R. (Insect Growth Regulator) now labeled for fruitflies. Gentrol interrupts the life cycle of a variety of insects. In roaches it stops them from reproducing. In stored grain insects and fruitflies it kills them in the pupal stage. Either way, it puts a stop to future insects. It is used as is applied to drains and any area fruitflies are breeding. Gentrol is safe and recommended for hospitals, schools, and residences. Cost per 16 oz.