Effects Of Host Plant On Development And Reproduction Of B Biotype Bemisia Tabaci

Bemisia tabaci (Gennadius) first draw major attention in the mid-1980s when severe crop losses were observed in Israel and the southern USA, now it has become an important invasive species that has caused severe damage in many regions of the world. B.tabaci is considered as a complex species comprising a large number of biotypes, among which the B biotype is a particularly aggressive one. The B-biotype spread fast in China since mid-1990 and was listed one of most invasive creatures by quarantine authority. B.tabaci destroys crops by feeding host plants directly, also contains the known whitefly vector of plant-infecting begomoviruses, which were the causal agents of mosaic diseases of many vegetables and flowers.B.tabaci was transferred from the primary host plant (cabbage) to other four secondary or alternative host plants, poinsettia, cotton , cucumber and tomato.2 or 3 years late, body size, development , longevity , fecundity and survivorship of 5 B.tabaci populations on cabbage were studied in the laboratory.2 years late, results showed that first,second and third instars of poinsettia population B.tabaci significantly shorter than the correspondent stages of other four populations B.tabaci ;Cabbage or poinsettia population B.tabaci had a significantly longer developmental time from egg to adult than tomato population B.tabaci. Adult females of cabbage population B.tabaci lived significantly shorter than other four populations B.tabaci. The fecundities of poinsettia population B.tabaci were significantly greater than other four populations B.tabaci. There was no significant in percentage of survival from egg to adult stage among the five populations B.tabaci.3 years late, individuals fed on cabbage developed significantly faster than those on any other host plant during the immature stages. In contrast, the individuals fed on poinsettia had a significantly longer developmental time (20.15d) from egg to adult than did insects fed on cucumber or tomato. B.tabaci fed on cabbage had the highest percentage of survival from egg to adult (72.92%), whereas the populations fed on tomato had significantly lower survivorship (58.15%). Adult females lived significantly longer on poinsettia or cotton than on tomato or cabbage. The females reared on poinsettia and cabbage laid more eggs than those reared on cotton or cucumber.Individuals fed on the five host plant except poinsettia had a longer development time after 3 years then those did after 2 years. B.tabaci fed on five host plants except cabbage had lower of survival from egg to adult after 3 years than those did after 2 years. Adult females lived longer on poinsettia or cabbage after 3 years than those did after 2 years. The females reared on all the five host plants laid less eggs.We concluded that host plants had a significant effect on development time and so on. We also demonstrated that oinsettia had the most effects on B.tabaci under the same environmental conditions.