The survival and fecundity of the scale insect,Melanaspis glomerata (Green) varies according to the sugarcane varieties on which they feed. When the sugarcane setts infested with scale insect crawlers were maintained on different nutritional bases, high survival and fecundity were observed in distilled water as the medium. The nutrition of immature stages and adults of the egg parasite,Trichogramma spp. was found to influence the longevity and reproduction. The eggs ofCorcyra reared on groundnut kernels had appreciable quantities of growth promoting amino acids like glysine, analine and tyrosine and this influenced the size of the adult parasites. The higher fecundity of the parasites obtained from the eggs ofCorcyra reared on greengram was attributed to the maximum level of nutrients. The individuals which emerged from superparasitized eggs showed reduction in mating and fecundity because of the sharing of the nutrients. The adult longevity and fecundity increased when fed with different sugars in the presence of host eggs. Increase in the protein content in adult diet decreased the fecundity.
In the larval parasite,Sturmiopsis inferens the qualitative variation in the nutrient contents due to interspecific variation and quantitative variation as influenced by the size of the host influenced the reproductive capacity of the parasite.