Efficacite des traitements chimique et biologique sur les Culicidae: Effet letal du temephos et taux de consommation par Gambusia affinis

Abstract

In this work, we carried out a laboratory study on chemical control of larvae of two species of Culicidae: Anopheles hispaniola, a potential vector of malaria (Guy 1963) and Culex pipiens using Temephos, an organo-phosphorus liquid-state EC500 (Emultion Concentation) larvicide. Under these conditions one litre of Temephos contains 500 g of active product (500 g.L-1). This study showed that the LC50 (30min.) at L2 instar was 21 μg.l-1 in A. hispaniola and 10 μg.l-1 in C. pipiens. The LC50 (60min.) at L4 instar was 23 μg.l-1 and 12 μg.l-1 respectively. Consumption rate of A. hispaniola larvae (instar L4) by the mosquitofish Gambusia affinis varies according to the media but remains higher in females than in males.