To clarify how transgenic cotton contributes to these outbreaks, a four-year field
investigation of population dynamics and laboratory life table studies were carried out from 2007 to
2010 to evaluate the impact of two transgenic cotton cultivars (SGK321 expressing Cry1Ac þ CpTI and
GK12 expressing Cry1Ac) and their corresponding parental non-transgenic lines (Shiyuan321 and
Simian3) on A. lucorum.