Studying the Effect of some Nanoparticles on the Percentage of Mortality of Larval Stages of Mosquitoes Culex Pipiens L.

Abstract

The effect of different concentrations of silver nanomaterials and nano-titanium dioxide on the percentages of larval stages of Culex pipiens mosquitoes was studied. The results indicated that there was a direct relationship between each of the concentrations and exposure time on the one hand, and the mortality rates of larval instars on the other hand. Whereas silver nanoparticles outperformed titanium dioxide in achieving the highest rates of killing rates reaching (84.99, 74.16, %) respectively for both treatments at Concentration (2000) ppm after exposure period (48) hours. We also note an increase in the rates of killing rates after an exposure period of 48 hours (56.15 ,49.82) % compared to the rates of killing after an exposure period (24) hours, which amounted to 37.16%, 31.49) respectively for both treatments. Killing and the age of the larva, as the killing rates decrease with the increase in the age of the larva, so it was the highest killing rate in the first larval stage, reaching (50.33%) , (55.66%) respectively for both treatments.