Insecticidal and knock-down activities of fenvalerate optical isomers against the German cockroach, Blattella germanica, were determined. [S, S]-isomer showed about 4times higher insecticidal and knock-down activities than racemic fenvalerate. However, the insecticidal activity of [R, S]-isomer was only one-tenth that of racemic fenvalerate, and it showed no knock-down activity. [S, R]- and [R, R]-isomers did not show insecticidal activity. Electrophysiological study showed that only [S, S]-isomer was effective against the central nervous system of the insect. These results suggested that only [S, S]-isomer was the active component of fenvalerate. It was assumed that the insecticidal activity of [R, S]-isomer was due to [S, S]-isomer contained in the [R, S]-isomer sample as impurities or [S, S]-isomer isomerized from [R, S]-isomer in the body.
CITATION STYLE
UMEDA, K., YANO, T., & HIRANO, M. (1990). Esfenvalerate : Its biological activity against German cockroach, Blattella germanica (Orthoptera : Blattellidae). Medical Entomology and Zoology, 41(4), 347–351. https://doi.org/10.7601/mez.41.347
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