Mosquitocidal and oviposition deterrent effects in medicinal and other plant extracts on Culex pipiens L.

الملخص EN

Mosquitocidal effect of neem seed kernels, A.

indica, R.

stricta, H.

bacciferum, S.

aromaticum cloves and orange peels extracts were tested on Culex pipiens L.

All materials significantly deterred oviposition at 0.05 and 0.1 % concentrations of water or methanol extracts.

Up to 100 % inhibition of oviposition was obtained in 0.05 % A.

indica and R.

stricta aqueous or methanol extracts ; 0.05 % citrus peels methanol extract and 0.1 % methanol extracts of all materials.

Acute LC50s were 270, 950, 941 and 1131 ppm, water extract, for R.

stricta, A.

indica, H.

bacciferum and S.

aromaticum, respectively.

Chronic toxicities caused by R.

stricta at 0.02 and 0.04 % concentrations, reached up to 70 % and 100 % larval mortality, respectively.

All materials conferred significant negative influence on larval development, consequently reducing pupation and adult emergence.

R.

stricta and S.

aromaticum caused severe impact on development where only 10 and 16.7 % of the larvae reared in media containing 200 ppm of their water extracts completed their development to pupal stage, and none reached adulthood.

Application of such compounds, if proved environmentally safe, to mosquito breeding sites may have great practical significance on management of C.

pipiens field populations.