The bio efficacy of insect growth regulators is generally manifested during ecdysis as it disturbs the process of chitin deposition, thus effecting growth and development of the insects. It also results in failure to feed, due to displacement of mandibles, maxillae and labrum and blockage of the gut. These insect growth regulators also produce delayed symptoms, in which the adults fail to escape from pupal skin and therefore can not fly, feed and mate. These insecticides also induce the fertility and fecundity as observed by many entomologists. The insect growth regulator, a fourth generation insecticide, accidentally came in the existence in the Laboratory of Philips, Duphar, The Netherlands, while preparing the herbicides. First insect growth regulator synthesized, was diflubenzuron, which belong Benzoyl phenyl urea group. Later, different groups of insect growth regulators, having chitin biosynthesis inhibiting property, were identified. The present study is designed to study any correlation between reproductive success and sterility in novaluron treated insects.