Abstract
Disruptive selection has been used to obtain the inbred two-spotted spider mite strains resistant to four insectoacaricides—dimethoate, bifenthrin, abamectin, and bromopropylate. The resistance ratios (RRs) for the mites in families of the selected strains are 1000-, 2600-, 2000-, and 2000-fold, respectively. The distribution according to mortality rate of the F1 families in the crosses of resistant and susceptible mite strains and Fa backcrosses has shown a monogenic dominant inheritance of the dimethoate resistance, digenic dominant inheritance of the abamectin resistance, and digenic incompletely recessive inheritance of the bifenthrin and bromopropylate resistances. The data on the cross-resistance to acaricides of different chemical classes suggest that the genomes of the selected mite strains carry mutations conferring resistance to the corresponding toxicants.
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