Cross-Resistance Pattern and Genetic Studies in Spirotetramat-Resistant Citrus Red Mite, Panonychus citri (Acari: Tetranychidae)

In the laboratory, an acaricide-susceptible strain of citrus red mite, Panonychus citri (McGregor) (LS-FJ), was used to screen for resistance spirotetramat. A spirotetramat-resistant (ST-NK) obtained after continuous selections through 15 selection cycles (45 generations) exhibited 1668.4-fold greater when compared parent generation. Instability spirotetramat in mites observed during 11 months under spirotetramat-free laboratory conditions. Cross-resistance spirodiclofen and spiromesifen detected both eggs larvae, but not five other tested acaricides. Probit lines F1 heterozygous progeny indicated that autosomal with neither sex linkage nor maternal effects. The degrees dominance were 0.15 0.23 diploid LS-FJ♀ × ST-NK♂ ST-NK♀ LS-FJ♂, 0.07 0.13 haploid F2 respectively, which incompletely dominant. χ2 analyses from response a backcross crossed ST-NK showed multiple genes are responsible