Induction effects of different host plants on the insecticide susceptibilities and detoxification enzymes of the spider

mite, Tetranychus cinnabarinus (Boisduval)were measured in mites that had been reared on beans, cucumbers, cabbages, and

eggplants for 3 generations. The founders of each mite population had been obtained from bean plants. Mites fed on cucumber,

cabbage, and eggplant displayed increased susceptibility to abamectin, whereas susceptibility to bifenthrin was more

variable. The LC50 values of mites on cabbage and eggplant were, respectively, 0.27 times and 0.44 times that of those on

beans. The activities of mites’ detoxification enzymes differed on different host plants. The activities of MFO and CarE in

mites on cucumbers were significantly higher than in those on the other 3 host plants and GST activity of mites on beans was

significantly higher than in those on other plants. The AchE activity of T. cinnabarinus on cabbage was 3.37 times higher

than that of those on beans. These results show that shortterm rearing of T. cinnabarinus on different vegetable crops can

induce different insecticide susceptibilities and detoxifying enzyme activity.