“…Field level studies of the performance of Bt cotton have been completed in the USA (Falck-Zepeda et al, 2000a, 2000b, 2000c, Mexico (Traxler et al, 2003), Argentina , Australia (Fitt, 2003), South Africa (Ismael et al, 2001), China , and India (Qaim and Zilberman, 2003). In all three NSAm countries, Bt cotton varieties had higher effective yields, were more profitable, and saved on pesticide expenditures.…”