author(s)
Subash Singh

abstract
A global adoption of transgenic cotton resulted in around 42 per cent rise in area in 2017-18 since last two decades. The bollworms (BW) were the most serious problem on non-transgenic cotton causing around 20-66 per cent yield loss in India. However, its adoption involved several benefits such as low insecticidal load, control of BW and more productivity but the farmers due to higher seed rates have been using illegal and low tolerance Bt cultivars that not even resulted into a heavy crop damage but also resistance in secondary pests that are not susceptible to the expressed toxin have become an increasing concern in some agro-ecosystems where Bt cotton is grown. The success of transgenic cotton is still an unanswered task in the developing countries.