Abstract
Varying degrees of cross-resistance in a permethrin-resistant ( R ) strain of Amblyseiusfallacis Garman were found to four pyrethroid compounds which had acaricidal activity to both organophosphate R and S strains of the twospotted spider mite, Tetranychus urticae Koch. Toxicities to T. urticae at the LC50 level were in the range of 0.008 to 0.50% AI; however, all compounds showed a shallow slope in the id-p response curve. LC50 values to permethrin R and S strains of predatory mites showed a greater range of toxicities (0.0001 to 0.03% AI); however, LC response curves showed steeper slopes to all compounds tested as compared to the prey mites. With regard to prey-predator selectivity ratios, SD 57706 was the most selective to the organophosphate-resistant T. urticae strain vs. the resistant A. fallacis strain (0.63 resistance ratio value at the LC50 level), there being a 46-fold cross-resistance difference between the permethrin R and S strain of A. fallacis . The possibilities for developing selective acaricides and Insecticides from this chemical class of compounds are discussed.
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