Abstract：The bioassay research of spirotetramat in Bemisia tabaci egg，nymph and adult were investigated．96 % movento showed high toxicity to egg and nymph of B.tabaci，which had no significant difference compared with that of 95 % imidacloprid used as a controlling pesticide and LC50 were 18.91 mg?L-1 and 14.97 mg?L-1，respectively．However，96 % movento showed low toxicity to adult of B.tabaci and LC50 were up to 453.34 mg?L-1，which was significantly higher than that of 95 % imidacloprid．On the other hand，24 % movento SC has good control effect and persistence to B.tabaci through field experiment．The combinations effect of movento and biopower were obviously better than that of movento used alone．The results showed that control effects of 24 % movento SC biopower 0.2 %（3.6 g?hm-2）were 64.91 %-66.92 %，82.00 %-82.59 %，88.11 %-89.97 %，89.99 %-93.94 % and 91.10 %-93.56 % after spaying 1-28 days，respectively．
