ORGANOPHOSPHOROUS AND CARBAMATE RESISTANC E IN A POPULATION OF CULEX-QUINQUEFASCIATUS

The population of Culex quinquefasciatus breeding in the Pinheiros Riv er (S. Paulo, Brazil) has been controlled with organophosphates since 1980. However, the biting has constituted a continual nuisance to the human population who live in the vicinity of the river. The occurrence of insecticide resistance to at least two organophosphates and one ca rbamate (malathion, fenitrothion and propoxur, respectively) to this i nsect population is reported. The results show the need to develop an insecticide management program. Tile suscetibility to permethrin (pyre troid) suggests the possibility of using tills class of insecticide sh oul the need Sor replacement of the insecticide in the arise.