Abstract
Of 81 insecticides tested in the laboratory as contact sprays against a suceptible and a resistant strain of house flies, Musca domestica L., only Stauffer B-10341 (O-Ethyl methy]phosphonothioate O-ester with p-hydroxybenzoni- trile); Bay 62863 (2,3-Dihydro -2 -methyl -7 - benzofuranyl methylcarbamate); CELA K-41 (O- (4-Bromo-2,5-dichloro- phenyl) O-methyl ethylphosphonothioate); Stauffer B- 10095 (O-Ethyl (ch]oromethyl) phosphonothioate O-ester with p-hydroxybenzonitrile); mecarbam; and Bay 78182 (O,O.Diethyl phosphorothioate O-ester with (O-chloro phenyl) glyoxylonitrile oxime) were more effective against both strains than the standard ronnel when compared on the basis of LC50values. Also, 16 other insecticides were more effective than ronnel against the resistant strain but less effective than ronnel against the susceptible strain. None of the 22 were so effective against the resistant strain as against the susceptible strain.
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