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Green nanoparticle synthesis was achieved using environmentally acceptable plant extracts and eco-friendly reducing and capping agents. In the present study, activity of silver nanoparticles (AgNPs) synthesized using <em>Cadaba indica</em> lam plant against <em>Anopheles stephens</em>i and <em>Culex quinquefasciatus</em> was determined. A range of concentrations of synthesized AgNPs (3.125, 6.25, 12.5, 25, 50 ppm) and crude extract (50, 100, 150, 200, 250 ppm) were tested against <em>A. stephensi </em>and <em>C. quinquefasciatus</em>. The synthesized AgNPs from <em>C. indica</em> lam were much more toxic than crude extract in both mosquito species. The cured extract high mortality values were 50% lethal concentration (LC₅₀)=88.22, 90.84 ppm; 90% lethal concentration (LC₉₀)=172.94, 178.55 ppm, and the AgNPs high mortality values were LC₅₀=3.90, 4.39 ppm; LC₉₀=19.04, 17.35 ppm against <em>A. stephensi</em> and <em>C. quinquefasciatus</em>, respectively. The results recorded from ultraviolet-visible spectrophotometer, scanning electron microscopy, energy dispersive X-ray and Fourier transformed infrared support the biosynthesis and characterization of silver nanoparticles. These results suggest that the leaf cured extracts of <em>C. indica</em> lam and green synthesis of silver nanoparticles have the potential to be used as an ideal eco-friendly approach for the control of <em>A. stephensi</em> and <em>C. quinquefasciatus</em>.