Mode of inheritance of resistance to three new acaricides in the Kanzawa spider mite, Tetranychus kanzawai Kishida (Acari : Tetranychidae)

The genetics of resistance to three new types of acaricide - tebufenpyrad, fenpyroximate and pyridaben - was studied by crossing a resistant (R) with a susceptible (S) strain of Tetranychus kanzawai Kishida. The resistance ra tios calculated from the LC(50)s of the R and S strains were 97, 1265 and 1 34 for tebufenpyrad, fenpyroximate and pyridaben, respectively. The respons es to the three acaricides in F-1 females from reciprocal crosses between t he R and S strains showed that the modes of inheritance of resistance to te bufenpyrad, fenpyroximate and pyridaben were intermediate, incompletely dom inant and completely recessive, respectively. Furthermore, the responses of F-2 females from the reciprocal crosses indicated that the resistance to t he three acaricides was under monogenic control. Exp Appl Acarol. 22: 699-7 08 (C) 1998 Kluwer Academic Publishers.