An investigation was made into the effect of transgenic cotton on the life table parameters of Tetranychus turkestani

(Ugarov et Nikolskii), which is the dominant mite species in northern Xinjiang. Experiments were conducted to construct life

tables for T. turkestani on univalent transgenic cotton Xinmian 33B(Bt), the bivalent transgenic cotton Zhongmian 41

(Bt+CpTI) and conventional cotton Zhongmian 49 Univalent transgenic cotton or bivalent transgenic cotton had no obvious

effects on mites developmental period or fecundity parameters. Furthermore, there was no significant difference in the net

reproductive rate, intrinsic rate of increase, mean generation time, doubling time and finite rate of increase between T.

turkestani fed on transgenic cotton and and T. turkestani fed on conventional cotton, suggesting that transgenic cotton does

not affect the development, fecundity and populations of cotton mites.