Further Studies on the Toxicity of Insecticides to Diazinon-Resistant Musca domestica1

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Abstract
A strain of house fly, Musca domestica L., which had developed resistance to Diazinon®(O,O-diethyl O-(2-isopropyl-4-methyl-6- pyrimidinyl) phosphorothioate) in the field and then was subjected to further selection on Diazinon in the laboratory, showed increased tolerance to the following materials: heptachlor (468- fold), heptachlor epoxide (809), barthrin (3), demeton (12), phorate (17), dimethoate (3), DDVP (4), dicapthon (18), Dibrom® (1,2-dihromo-2,2-dichloroethyl dimethyl phosphate) (4), Phosdrin® (1-methoxycarbonyl-l-propen-2-yl dimethyl phosphate) (7), Am. Cyanamid 18706 (O,O-dimethyl S(N-ethyl carbamoyl methyl) phosphorodithioate (technical) (5), Thiodan® (6,7,8,9,10,10-hexachloro-1 ,5,5a,6,9,9a- hexahydro-6,9-methano- 2,4,3-benzodioxathiepin-3-oxidc) (58), Bayer 29493 (O,O-dimethyl O-(4-methylthio-m-tolyl) phosphorothioate) (8),G-30494 (S-2(2,5-dichlorophenylthio)methyl O,O-dimethyl phosphorodithioate) (12), Dimetilan® (3-methyl-5-pyrazolyl dimethylcarbamate) (6), Dipterex® (dimethyl 2,2,2-trichloro-1-hydroxyethylphosphonate) (7), Delnav® (2,3-p-dioxancdithiol S,S-bis (O,O-diethyl phosphorodithioate) (89), DMBC (2,4,-dimethyl benzyl chrysanthemumate) (3), and Thanite® (isobornylthiocyanoacetate) (34-fold).