Abstract: The duration of development, hatch rate, survival and fecundity of Tetranychus kanzawai were investigated by keeping the mites individually in the Constant temhumidity cabinets of 15℃ and 80% RH, 20℃ and 75% RH, 25℃ and 70%, 30℃ and 65% RH, and 35℃ and 60% RH respectively. The results showed that under 35℃ and 60% RH the mites exhibited the shortest generation (6.23±0.44) days. The average number of eggs laid per day by an adult was 7.18-t-1.56 with the highest number of 13.95± 3.72, and the oviposition period was (9.65±1.53) days, being the shortest. Under this condition, the hatch rate of eggs and the survival rate of young mites were 72.4% and 84. 5% respectively. While under the condition of 15℃ and 80% RH the mites had the longest generation (27.49±2.33) days, the mean number of eggs laid per day was 2.04±0.55, with the highest of 5±1.21, and the longest oviposition period was (28.4±4.06) days. The hatch rate of eggs and the survival rate of young mites were 85.6% and 97.0% respectively. It is manifested that the development of mites isinfluenced by both temperature and humidity. The mites developed faster under 35℃ but slower at 15℃, the optimal temperature for their development is considered to be within 25-30℃.

Key words: Tretranychus kanzawai, influences of temperature and humidity, generation period, oviposition quantity