Abstract:In order to evaluate thermal adaptation of Bemisia tabaci B-biotype eggs, survival and fecundity of B.tabaci after heat stress at 39℃ and 41℃ for 1h, 2h and 4h, respectively, at egg stage were compared with the untreated control treatment at constant 27℃. The results showed that both heat shock temperature and duration of exposure affected the survival, percentage of females, female longevity and fecundity significantly. Survival rates of B.tabaci from egg to adult after exposure at 41℃ for 1h and 4h at egg stage were 73.0% and 72.3%, respectively, which were significantly lower than that of control (84.2%). Survival of other heat shock treatments did not differ significantly with the control. Percentage of B.tabaci females was 61.3% after exposure at 41℃ for 1h, which was significantly higher than that of control (52.0%). Percentage of females of other heat shock treatments did not differ significantly with the control. After heat shock at 41℃ for 2h or 4h, adult longevity was 23.9d, which was significantly longer than that of control (19.9d); pre-oviposition period was 0.1d, which was significantly shorter than that of control (0.6d); average fecundity was 138.6 eggs or 149.1 eggs per female, which was significantly higher than that of control (126.2 eggs). Adult longevity was also significantly prolonged in other heat shock treatments than that of control. The oviposition rhythms and age-specific adult survival rates also changed significantly in these heat shock treatments, with prolonged survival duration and oviposition peak period.