Abstract: Based on the observation of free diffusion in petri dish and biology, the selectio
n behavior and biological parameters of Bemisia tabaci Gennadius biotype B o
n host plants cucumber, eggplant, pepper, cotton, and sweet potato were invest
igated. No difference was observed in the individual number of B. tabaci on
the five host plant leaves during the early period of free diffusion (within 2 h
), but changes were found within the following periods (4〖KG-*2〗-〖KG-*7〗48 h), i.e., the B.
 tabaci individuals increased on cucumber, decreased on pepper, and were rel
atively stable on eggplant, cotton, and sweet potato, which indicated that there
 were significant differences in the selectivity of B. tabaci on the five ho
st plants, with the highest selectivity to cucumber and the lowest selectivity t
o pepper. Pretreatment by starvation and imidacloprid did not affect the selec
tivity of B. tabaci. There were significant differences on the honeydew excr
etion of female B. tabaci adults on the host plants, which was in the order
of cucumber>sweet potato>cotton>eggplant>pepper. The average longevity of B.
tabaci adults on cucumber, eggplant, sweet potato, and cotton was significantl
y longer than that on pepper, and the total number of eggs laid per female on
cucumber, eggplant, sweet potato, and cotton (22433, 18233, 19173, and 172
60 respectively) was significantly larger than that on pepper (only 4783).
 No significant differences were observed in the hatching rate and development p
eriod of the eggs on the five host plants. The development period of nymphs on c
ucumber, eggplant, sweet potato, and cotton was 1060 d, 1196 d, 1111 d, and 1320 d, and the mortality was 521%, 2778%, 1724%, and 3711%, respective
ly. The nymphs failed to develop normally on pepper.

Key words: Bemisia tabaci Gennadius biotype B, host plant, selectivity, biological parameter, soil moisture and temperature effect, plastic film mulching with double ridges and furrow planting, yield, dryland farming, soybean.