Recherche de capacité biologique des extraits obtenue à partir des différentes parties de Capparis spinosa L. (Capparidaceae)

Abstract

The study on the toxicity of leaf extracts of Capparis spinosa L. plant (Capparidaceae) harvested in the northern Sahara, Algerian East against the L 3 larvae of Culex pipiens L. (Diptera, Culicidae). It is noted that larvae of Culex pipiens treated with the aqueous extract Capparis spinosa, a mortality rate which varies with the concentration of extract. In effect the percentage of the maximum mortality is reported for the larvae treated with plant extract concentrated to 100%, 90%, 80%, 70%, 60%, 50%, 40% and 30% mortality rate 100% after five days of exposure. While extracts 20%, 10% where mortality is around 50% and 33.3% respectively were recorded. The CE50% and CE 90% calculated for the third-stage larvae (L 3 ) of Culex pipiens, have shown that the extract has proved advantageous in terms of toxicity, it has in effect an EC 50 and EC90% low, it is 0.08 mg / ml and 0.04 mg / ml respectively. Evaluation of lethal time 50 (LT50% ) and lethal time 90 (TL90% ), shows that the extract of C. spinosa 100%, 90%, 80%, shows a particular speed of action vis-à towards larvae of Culex pipiens. Well what these results are preliminary, they show a good larvicidal activity of aqueous extracts of leaves Capparis spinosa.