Resistance of Culex quinquefasciatus to selected chemical and biological pesticides.

Resistance of 3 organophosphorous insecticides (malathion, temephos, and chlorpyrifos), one carbamate (propoxur), and one pyrethroid (permethrin and permethrin + piperonyl butoxid), DDT and two microbial insecticides: Bacillus thuringiensis and B. sphaericus was investigated on Culex quinquefasciatus in Ougadougou, Burkina Faso, in 1996-97. The results showed that there was little or no resistance to the bio-larvicides, to the OP-compounds and the carbamate, but significant resistance to the pyrethroid and very high resistance to DDT. OP compounds were used in the 70s in less extensive campaigns, whereas DDT was used in Ouagadougou in the malaria campaign in the 60s. The data provide background for a follow-up on resistance measurements in C. quinquefasciatus that like Anopheles gambiae bites humans by night and therefore are expected to be impacted by and impact the LLIN campaigns realized in the town since 2004.