Evaluation du pouvoir biocides de l’extrait aqueux de Citrullus colocynthis L. schard (Cucurbitaceae)

Abstract

This study focuses on the study of larvicide to aqueous extracts of Citrullus colocynthis (Cucurbitaceae) harvested in northern Sahara region in eastern Algeria Metlili (Ghardaia) vis-à-vis the L3 larvae of Culex pipiens (Culicidae) of moustique.il is noted that larvae treated with the aqueous extract of Citrullus Colocynthis (Cucurbitaceae), a mortality rate which varies with the concentration of extract. After five (5) days Larvae treated with concentrations of 100%, 90%, 80%, 70%, 60%, 50%, 40% and 30% exhibit a maximum mortality rate of 100%. While in concentrations of 20% and 10% are of the order of 75%; And 70% respectively. 50 The lethal concentration (LC50) and the estimated third stage larvae (L3) of Culex pipiens LC90 showed that the extract is interesting in terms of toxicity since it has a LC50 and LC90 expressed as a 0 , 0041g / ml and 0.0151 g / ml, respectively. The evaluation of the light of the lethal time values TL50 and TL90 shows that the aqueous extract Citrullus colocynthis to100%, 90%, 80%,70%, 60%, 50%, 40% and 30% showed a rapid onset particular vis-à-vis the L3 larvae of Culex pipiens. Ces well what are preliminary results, they show a good larvicide activity of aqueous extract of Citrullus colocynthis.