Impact of environmental resistance factors on abundance of spotted bollworm, Earias vittella Fabricius and Helicoverpa armigera Hubner on Bt and Non-Bt Cotton in Odisha

The field study aimed to assess impact of environmental resistance factors on population dynamics of Earias vittella Fabricius and Helicoverpa armigera Hubner on Bt and non-Bt cotton was conducted at the Regional Research and Technology Transfer Station, Bhawanipatna, Kalahandi. The results revealed that the transgenic Bunny Bt cotton incorporated with Cry 1Ac and Cry 2Ab remained absolutely free from bollworms infestation throughout the crop season in 2013 and 2014.