Abstract:During 1996~1997,the components of diversity of the community in transgenic Bt cotton were studied in three plots i.e.,integrated pest management(IPM),natural enemies control(NEC)in transgenic Bt cotton and natural enemies control in traditional cotton(Control).Path analysis of composition of species diversity showed that it was dominant concentration and evenness that mainly decided the change of diversity index for pest natural enemy communities.Diversity index( H ‘)would be reduced with increasing of ...