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Insecticide resistance and cross-resistance in Aedes nigromaculis.

Laboratory tests on a strain of irrigated pasture mosquitoes, Aedes nigromaculis (Ludlow), collected from locations where control attempts with numerous insecticides failed during 1968 and 1969 show high resistance to commercial organophosphorus insecticides. This report includes the 1st confirmed case of mosquito resistance to naled, which is normally a very potent adulticide. The resistant strain shows less tolerance to carbamates than to other types of compounds that have been studied. A new carbamate, RE-11775 (m-sec -butylphenyl N -methyl-N-(phenylthio) carbamate) shows very promising larvicidal and adulticidal activity against the organophosphorusresistant strains.