Abstract
Parathion resistant and parathion susceptible strains of the Pacific spider mite, Tetranychus pacificus McG., were derived from certain field populations and established as laboratory colonies. The two colonies were characterized by dosage-mortality curves for the effect of parathion and also Aramite® (2-( p-tert butylphenoxyl)-1-methylethyl 2-chloroethyl sulfite). One generation selection experiments for parathion resistance and for Aramite resistance were performed on the susceptible colony. The colony responded to both acaricides. The colony responded to selection for parathion resistance by not only an increase in LC-50 but also by producing a population partitioned into susceptible and resistance classes, thus providing evidence for the existence of a major gene for resistance. The latter genetic hypothesis was then tested by performing conventional crosses between the original susceptible and resistant colonies. The results of these crosses produced further strong evidence For a major mendelian dominant with resistance to parathion dominant to susceptibility.
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