Inheritance of Resistance to Cyhexatin in the Kanzawa Spider Mite, Tetranychus kanzawai KISHIDA : Acarina : Tetranychidae

Abstract

The genetics of resistance to cyhexatin in Tetranychus kanzawai, one of the major pests of tea plants in Japan, was investigated using homogeneously resistant and susceptible strains of the mite. Similar dosage-mortality lines obtained in the F₁ progenies from reciprocal crosses indicated the absence of sex-linked inheritance. The dosage-mortality line in the F₂ progeny from backcrossing the F₁ hybrid to susceptible males was significantly different from that in the expected response estimated on the basis of monogenic inheritance. These results for F₁ and the backcross indicate that cyhexatin resistance in T. kanzawai is due to autosomal, polyfactorial genes.