Abstract: Influence of five host plants on development and reproduction of Tetranychus truncatus Ehara was investigated at 28℃ in the laboratory. The results Indicated that there were significant differences in the durations of different developmental stages, fecundity, egg production per day, net reproductive rate (R₀), finite rate of increase (λ), intrinsic rate of increase (r_m), mean generation time (T) and the days needed to double population size (DDP) when reared with these host plants. The time needed by females to complete a generation on cucumber, kidney bean, soybean, eggplant and corn were 9.3, 9.3, 9.6, 11.0 and 11.6 days, respectively. The viposition time lasted 9.9, 11.2, 12.9, 15.8 and 17.9 days, respectively on eggplant, cucumber, kidney bean, corn and soybean. Both fecundity and R0 of the mite were the highest on soybean, and the lowest on eggplant. The survival rates on soybean, corn, cucumber, kidney bean and eggplant were 93.6%, 91.7%, 89.8%, 84.3% and 61.6%, respectively. The survival curves fell into DeeveyⅠ. The mite displayed a decreasing preference on the five host plants in the following order: soybean, corn, cucumber, kidney bean and eggplant.

Key words: Tetranychus truncatus, host plant, survival curve, population parameters