Mosquito nets impregnated with insecticides are recommended for the control of the vectors of
malaria, particularly in Sub-Saharan Africa where their effectiveness is no longer to be demons -
trated (Lines, 1996). Nowadays, only the pyrethroid insecticides are used, because of their speed of action,
their high repulsive and irritating capacity towards mosquitoes, and their low toxicity for humans. However,
Anopheles gambiae s.l., the main vector of malaria in Africa, has become resistant to the majority of these
insecticides (Chandre et al., 1999; Koffi et al, 1999).One strategy suggested for the management of resistance
consists in combining a pyrethroid with an insecticide which has a different mode of action