Principal objectives of this study were to demonstrate the resistance to pink bollworm of cotton varieties with the Bollgard gene, ''NuCOTN 33^B'', "NuCOTN 35^B", ''H‑1220 B" y "H‑1244 B"), and to determine the differences in yield compared with conventional varieties.
In order to evaluate the differences on yield, the test included the recurrent parents of each transgenic variety (varieties without the Bollgard gene).
Varieties ''NuCOTN 33^B'' and ''NuCOTN 35^B'' were the most productive, with 3.175 kg/ha and 3.129 kg/ha, respectively. All the transgenic varieties had superior yields compared with their conventional varieties. It was because pink bollworm caused damage in the yield components of conventional cultivars: boll weight, fiber percent and seed index in conventional varieties, and not in varieties with the Bollgard gen.