Effects of plant extracts on fecundity and fertility of mosquitoes

Rearing of Culex quinquefasciatus, Anopheles stephensi and Aedes aegypti la rvae in water at concentrations less than the critical concentration for in hibition of adult emergence in 50% of treated larvae (EC50) of the ethyl ac etate fractions of Calophyllum inophyllum seed and leaf. Samadera suratense and Samadera indica leaf extracts and the petrol ether fraction of Rhinoca nthus nasutus leaf extract, from hatching to emergence significantly decrea sed the fecundity of the mosquitoes and the hatchability of their eggs. At the highest concentration of 50% EC50 of the extracts, the decrease in the fecundity over the control ranged between 62.4 and 87.4%. Sterility index o f the mosquitoes reared in the media with the different extracts at this co ncentration ranged between 82.8 and 93.3%.