A synthetic chemical, 0.5% granules of pyriproxyfen (S-31183), which acts as a juvenile hormone, was tested against Culex pipiens pallens and Cx. tritaeniorhynchus under field conditions. This compound was extremely effective against larvae of both species which showed high resistance to organophosphorus insecticides. Complete inhibition of adult emergence continued for 3 weeks or more in open polyethylene containers and irrigation ditches at a dosage of 0.01ppm, in cesspools at 0.05ppm and in sewers with inflow of house wastewater at 0.1ppm (AI). Activity of the compound was retained after a drying of the test site for several days. For evaluation of the effect of IGRs in the field, pupal isolates are preferable to larval isolates.
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Kamimura et al. (1991) studied this question.