Abstract
Log dosage-probit lines were established for 2 strains of Tetranychus mcdanieli McGregor with binapacryl and Union Carbide 19786 (2-sec-butyl-4,6-dinitrophenyl isopropyl carbonate). The increase in LC50 values and changes in slope indicated that the strain of mites from the Yakima Valley was resistant to these 2 compounds.

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