Toxicological tests were undertaken with a normal and an Or-resistant strain (Leverkusen-N and -R) of Tetranychus urticaeKoch using 2 phosphorus esters and a formamidine acaricide. The ratios at LC30-values between N and R were 410 for oxydemetonmethyl, 52.6 for parathion, and 0.0093 for chlorphenamidine (N'- (4-chloro-o-tolyl) - N,N-dimethylforl1lal1lidine). These data strongly indicate a negative correlation of OP resistance with the toxic action of chlorphenal1lidine in the above strains. The applicability of these findings for control of resistant strains in the field is discussed.
Document Type: Research Article
Publication date: February 1, 1969
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