Abstract: For understanding the changing of biological characteristics of Tetranychus cinnabarinus  (Boiduval) which had developed resistance to acaricides, the biological characteristics of the susceptible strain (S), the abamectin-resistant strain (AR) and the fenpropathrin-resistant strain (FR) at different temperatures were assayed and compared. The relationship between temperature and growth speed of the three strains was simulated using the Wang-Lan-Ding Models. The results showed the eggs of the S and FR strains did not hatch at the high temperature of 36℃ while that of the AR strain could complete generation development. Compared to the S strain, the AR and FR strains extended generation developmental time 7.98 and 6.15 days, respectively, and shortened the pre-oviposition duration about 2 days at  the low temperature of 15℃. The fecundity of the S strain was higher than that of the two resistant strains within the temperature range of 20℃-28℃ while lower than that of the AR strain at 34℃. The maximum boundary temperatures of S, FR and AR strains were 36.0℃, 36.1℃and 42.4℃, respectively. The results suggest that the AR strain has stronger tolerance  to high temperature than the other two strains.

Key words: Tetranychus cinnabarinus, resistance, temperature, developmental duration, fecundity