Distance IGR Insect Growth Regulator. Break the life cycle. A successful control program should do more than attack the adults—it should break the life cycle. Distance IGR controls whitefly, fungus gnat, scale and other insects by preventing eggs, larvae and pupae from maturing into breeding adults. Its unique, targeted mode of action makes Distance Insect Growth Regulator a natural for integrated pest management (IPM) or insect resistance management (IRM) programs.