Abstract: The assessment on the effect of Bt rice on nontarget arthropods is one of the important items in the ecological safety assessment of Bt rice. So far， many studies on the effect of Bt rice on nontarget insect pests were conducted. However， most of experiments were focus on the assessment for only one generation of nontarget organisms， which could not completely simulate the field condition. In present study， the nontarget pest， white backed planthopper (WBPH)， Sogatella furcifera(Horvth)， was successively reared on Bt rice varieties， T1C19 with cry1C gene and T2A1 with cry2A gene， and their parental rice MH63 for four generations and the multigeneration effects of Bt rice on survival， development and reproduction of WBPH were evaluated to assess the potential impact of Bt rice on WBPH. The results indicated that the nymph duration and survival rate， female adult weight， longevity and fecundity， and the egg hatchability of WBPH on Bt rice did not significantly differ from those on MH63 over four generations. It implies that T1C19 and T2A1 had no significant effect on nontarget pest WBPH．

Key words: transgenic Bt rice, Sogatella furcifera, development, reproduction, safety assessment