The inset growth regulators are in vogue for many time because of their specific mode of action. Crop protection has become an indispensable component in the latest technology of crop production and much emphasis has been given to chemical insecticides for the control of noxious crop pests. This has posed a burning and alarming situation due to the indiscriminate use of chemicals on various agricultural commodities, resulting resistance in insects to insecticides and adverse effects on beneficial insects and human beings through food chain. 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 cannot fly, feed and mate. These insecticides also induce the fertility and fecundity as observed by many entomologists. The study highlights the comparative effect of two insect growth regulators selected on biomass index of experimental insect.