Organophosphorus-resistance and Its Inheritance in the Predaceous Mite Amblyseius fallacis12

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Abstract
A strain of Amblyseius fallacis (Garman) from Belding, MI, with a 75-fold resistance to azinphosmethyl and a 120-fold resistance to diazinon was strongly cross-resistant to parathion and dimethoate, moderately cross-resistant to azinphosethyl, malathion, phosmet, methyl parathion, fenitrothion, fenthion, demeton, and phosphamidon, and slightly cross-tolerant to carbophenothion, phosalone, ethion, and tepp. When crossed and back-crossed with a susceptible strain, azinphosmethyl-resistance proved to be partially dominant and showed a clear segregation indicating that it was principally due to a single gene allele.

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