Toxicities of Selected Synthetic Pyrethroids to Two Species of Phytophagous Mites1

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Abstract
Laboratory experiments using the standard slide dip technique were conducted for selected synthetic pyrethroids and an organophosphorous insecticide to establish dosage-mortality data for the European red mite, Panonychus ulmi (Koch), and the twospotled spider mite, Tetranychus urticae Koch. After treatment, microscope slides containing mites were held under a photoperiod of LD 16:8 at 27°C and 95% relative humidity for 24 h before evaluation for mortality. Resulting mortality data were subjected to Finney’s log-probit analysis. All chemicals tested were more toxic to P. ulmi than to T. urticae. The effectiveness of the chemicals against P. ulmi based on LC50 values was fenvalerate > SD 47443 > flucythrinate > SD 41706 > permethrin (Ambush) > permethrin (Pounce) > phosmet. Effectiveness against T. urticae based on LC50 values was fenvalerate > SD 47443 > permethrin (Ambush) > SD 41706 > fenpropathrin > permethrin (Pounce) > flucythrinate > phosmet.