Organophosphate Resistance and Esterase Pattern in a Natural Population of the Southern House Mosquito from California1

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Abstract
The esterase pattern of locus Est-B and the oregano phosphate (OP) resistance genotype of single mosquitoes from a natural population of Culex quinquefasciatus Say were investigated. The Est-B polymorphism was found to involve: a) allozymes with different electrophoretic mobilities (Esterase-1 and -2), and b) allozymes with different staining intensities (Esterase-2a, -2b, and -2c). The most active allozyme (Esterase-2c) is always associated with OP-resistant genotypes, while the less active allozymes (Esterase-1 and -2a) with OP-susceptible genotypes. It also appears that Esterase-2b, which has a slightly higher activity than Esterase-1 or Esterase-2a, is associated with a small decrease in OP susceptibility. The role of Est-B locus in OP resistance is discussed.