Table 1.

Insecticide-resistant and susceptible strains used in the isogenic strain experiment. The overproduction of esterases is controlled by the Ester superlocus. Alleles for this locus are the wild-type susceptible Ester⁰ and the insecticide-resistant Ester⁴ allele (most common allele in the Montpellier region which overproduces the esterase A4 and B4 isozymes). The modification of the acetylcholinesterase is controlled by the locus ace-1. Alleles for this locus are the wild-type susceptible ace-1^S and the insecticide resistant ace-1^R. For more details on these strains, see Berticat et al. (2002). Since their creation, the SLAB, SA4B4, and SR mosquito strains have been kept in culture in the laboratory. To avoid genetic drift and due to the occasional contamination of the lines, they have been regularly backcrossed over the years (to obtain newly crossed SA4B4 and SR lines). The lines used in this study had been last crossed <1 year before the beginning of the experiment

Strain	IR mechanism	Alleles	Genetic background
SLAB	None	Ester0, ace-1S	SLAB
SA4B4	Overproduction of esterases A4 and B4	Ester4, ace-1S	SLAB
SR	Insensitive acetylcholinesterase	Ester0, ace-1R	SLAB