Study of toxicological activity of the essential oil of Ocimum basilicum L. against Culicidea larvae in Algeria

The present study aims to assess larvicidal activity of essential oil of Ocimum basilicum leaf (Lamiaceae) against larvae of the most abundant mosquito species, Culex pipiens L., 1758 (Diptera, Culicidae). The essential oil of Ocimum basilicum was tested on larvae of the 4th instar Culex pipiens at different concentrations. The results obtained indicated a sensitivity of Culex pipiens larvae for the plant species. This sensitivity is even greater when the exposure of larvae to insecticides is prolonged. the highest mortality rate was checked in for the dose of 2mg/l, indeed after 24 hours of contact with the insecticide the maximum of mortality (56%) is recorded for the dose of 2mg/l against 13% of mortality for 1mg/l. After 48 hours of exposure at 2mg/l of concentration, the mortality was 72%. The highest mortality (91%) was observed after 72 hours of exposure at a dose of 2 mg/l.Thus, these results can provide an opportunity to develop alternatives of chemicals, because, which they are generally safe for the environment, as well as for the other living organisms.The present study aims to assess larvicidal activity of essential oil of Ocimum basilicum leaf (Lamiaceae) against larvae of the most abundant mosquito species, Culex pipiens L., 1758 (Diptera, Culicidae). The essential oil of Ocimum basilicum was tested on larvae of the 4th instar Culex pipiens at different concentrations. The results obtained indicated a sensitivity of Culex pipiens larvae for the plant species. This sensitivity is even greater when the exposure of larvae to insecticides is prolonged. the highest mortality rate was checked in for the dose of 2mg/l, indeed after 24 hours of contact with the insecticide the maximum of mortality (56%) is recorded for the dose of 2mg/l against 13% of mortality for 1mg/l. After 48 hours of exposure at 2mg/l of concentration, the mortality was 72%. The highest mortality (91%) was observed after 72 hours of exposure at a dose of 2 mg/l.Thus, these results can provide an opportunity to develop alternatives of chemicals, because, which they are generally safe fo...