BMB171-15 is Bt acrystalliferous strain BMB171 harboring cry6Aa2 (GenBank Acc. No. AF499736) cloned in Escherichia coli- Bt shuttle vector pHT304 (Yu et al., 2008), which was used for preparation of Cry6Aa2 toxin. BMB171-16 is BMB171 harboring empty vector pHT304, which was used as control in pot experiment.