[The enzyme systems in natural populations of the housefly Musca domestica highly resistant to organophosphate insecticides].

Two natural population of house flies from the Podol'sk District, Moscow Province have been studied. The both natural populations proved to be highly resistant to organophosphorus insecticides and sensitive to pyrethroids. The activity of esterases and glutathione-S-transferase has been studied, as well as the sensitivity of the enzymes of esterase complex in vitro to TBTP, DDVP and paraoxon, as compared with that of the sensitive strain SRS.