A Meta-Analysis of Transgenic Bt Cotton Efficacy: 1996-2015, Preliminary Data

Transgenic Bt cotton resistant to lepidopteran pests was released for commercial production in 1996. Since that time, there have been five commercialized technologies (Bollgard, Bollgard 2, Widestrike, Twinlink, and Widestrike 3) available for planting in the United States. A systematic review and meta-analysis was conducted to evaluate the efficacy of these technologies against Helicoverpa zea across a large geographic region and with various lepidopteran pest management tactics. This paper will discuss the current finding of this on-going analysis.