Transmission of Resistance Between Strains of Two-Spotted Spider Mites1

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Abstract
In cross-mating individuals from an acaricide-resistant strain of Tetranychus telarius and of a non-. resistant strain, the F1 females from all crosses were resistant. The haploid male progeny from the cross between a resistant female and a non-resistant male were resistant, whereas all the haploid males of the non-resistant female and resistant male crosses were non-resistant. Characters for resistance were transmitted by either sex. In crosses between F1 females of resistant-nonresistant matings and haploid males from a resistant parent all backcross females were resistant, but where similar F1 females were mated with nonresistant males the backcross females were resistant in a 1 to 1 ratio. Resistance appears to be a dominant characteristic and probably involves a simple factor. Females in F1 and F2 generations, and back-crosses, produced eggs in abundance, indicating that the 2 strains were of the same species. In matings between males or females of resistant T. telarius mites and individuals of the opposite sex of T. cinnabarinus mitei, the F1 female progeny were sterile hybrids that produced no eggs; yet both resistance and the red coloration of cinnabarinus were transmitted to the F1 female progeny.

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