EFFICIENCY OF CHEMICAL AND BIOLOGICAL TRE ATMENTS ON CULICIDAE LARVAE- LETHAL EFFECT OF TEMEPHOS AND CONSUMPTION RATE BY GAMBUSIA-AFFINIS

In this work, we carried out a laboratory study on chemical control of larvae of two species of Culicidae : Anopheles hispaniola, a potentia l vector of malaria (Guy 1963) and Culex pipiens using Temephos, an or gano-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 in star was 21 mu g.l(-1) in A. hispaniola and 10 mu g.l(-1) in C. pipien s. The LC50 (60min.) at LA instar was 23 mu g.l(-1) and 12 mu g.l(-1) respectively. Consumption rate of A.hispaniola larvae (instar IA) by t he mosquitofish Gambusia affinis varies according to the media but rem ains higher in females than in males.