Abstract:Phloem-feeding insects are highly specialized in their mode of feeding and present a unique stress on plant fitness. Not only do these insects feed for prolonged periods of time on host photoassimilates, but also they pose a threat as vectors of plant viruses and deposit honeydew to encourag the growth of mold. There are approximately 1500 described species of whitefly (Homoptera: Aleyrodidae), which are divided into two subfamilies: Aleyrodinae (of world-wide origin) and Aleyrodicinae (originating mostly in Central and South America), with most species occurring in the warmer, tropical, and subtropical regions. Since the emergence of several polyphagous pest species, such as the spiraling whitefly, the greenhouse whitefly and the sweetpotato whitefly, whiteflies have received much attention. The wide whitefly-plant associations resulting from their extensive geographical and host plant ranges provide ample opportunities for complex interactions with organisms at all trophic levels. Bemisia tabaci (Gennadius) biotype B is an important pest which has erupted and caused severe worldwide damage the last 20 years. Whitefly (Homoptera: Aleyrodidae) comprise tiny phloem-sucking insects. The sessile development of their immature and their phloem-feeding habits (with minimal physical plant damage) often lead to plant-mediated interactions with other organisms. Whiteflies are phloem-feeders that excrete excess sugars as honeydew. The life cycle of whitefly comprises an egg, four nymphal instars, and winged adults. The eggs hatch into crawlers, which is the only mobile immature stage. Once settled, crawlers molt to sessile second instars with dysfunctional legs. Following two additional molts, the pharate adults develop within the cuticle of the fourth instars, emerging aswinged adults (1-2 mm) that live up to several weeks.The life cycle is mainly regulated by temperature (taking 2-3 weeks to several months to complete) but may include a long diapause. Ninety percent of B. tabaci adults emerged from their pupal cases between 6:00 am and 9:30 am. Few emerged during hours of darkness. Recent progress in studying mechanisms of its invasion indicates the greater ability of competitive displacement which involves the competition of ecological niche, reproduction interference, the interactions of whitefly and virus with indigenous B. tabaci and other competing herbivores, is the most important factor. The successful invasion and spread is affected by the pesticide resistance. In the meantime, the ecological environment such as host, climatic factor, over wintering sites also affected B. tabaci. Temperature affected the development, survivorship, and fecundity of Bemisia tabaci (Gennadius) biotype B significantly. Most of the vegetables and ornamental plants affected by this pest. Thereby, much attention to the infestation of whiteflies or increase of whitefly populations should be taken. The developmental time of Bemisia tabaci (Gennadius) biotype B was studied at 5 different constant temperatures. The temperature threshold of egg, first, second, third, fourth instars and total generation was 12.93、12.66、11.83、12.38、12.82, and 12.20℃ respectively, while the effective temperature was 99.53、61.81、47.39、36.73、81.95 and 329.96 degree. Base on these data and weather data, the pattern of appearance in spring and disappearance in autumn of Bemisia tabaci in China were forecast using ArcGis software. The results can offer important reference to forecast and management of Bemisia tabaci biotype B in China. Temperature is important in the successful establishment of insect population.