Abstract: 【Objective】The effects of brief exposure to high temperature on survival and fecundity of two whitefly species, Trialeurodes vaporariorum and Bemisia tabaci B-biotype, (Homoptera: Aleyrodidae) were studied to understand occasional changes in the biological characteristic of whitefly species encountered high temperature stress. 【Method】The survival rate, longevity, reproduction and survival rate from egg to adult of F1 progeny of Bemisia tabaci B-biotype and Trialeurodes vaporariorum were evaluated after the adults were exposed to five degrees of temperature, 37, 39, 41, 43 and 45℃, for 1 hour in climatic incubators. 【Result】The survival rates of adults of both whitefly species decreased with the increase of temperature. Within the range of 37 to 45℃, the survival rate of B-Biotype B. tabaci adults decreased from 99.1% to 42.6%, and T. vaporariorum adults varied from 95.0% to 13.5%. The survival rates of adults of B-biotype B. tabaci were higher than that of T. vaporariorum when these two whitefly species was compared. After brief exposure to high temperatures, the longevity of both sexual adults of two whitefly species became shorter than the controls, and the males lived a shorter time than the females. The reproduction per female of B. tabaci B-biotype varied with the exposure temperature, but there were no significant differences between the treated and the control female individuals. In the case of T. vaporariorum, the number of eggs reproduced by per female was strongly affected after exposure to high temperature and the female adults ceased oviposition activity after exposure to 45℃ for 1h. The total survival rate from egg to adult of F1 progeny that produced by adults of both whitefly species was significantly affected by experience of brief exposure to high temperature and F1 progeny of B-biotype B. tabaci had higher survival rate than that of T. vaporariorum. 【Conclusion】The adults of T. vaporariorum were found to be less adaptability to high temperature than that of B-biotype B. tabaci adults. And the adaptability to high temperature may be the important reason that leads to two whitefly species interspecific differentiation in seasonal dynamics in China.

Key words: Bemisia tabaci B-biotype, Trialeurodes vaporariorum, high temperature, survival, fecundity