The research was conducted during kharif 2016 at CCSHAU, Hisar. Transgenic cotton RCH 650 BGII and variety H 1098 i was evaluated for their reaction to cotton leafhopper under unsprayed condition. Observations on cotton leafhopper were recorded at weekly intervals. | Population dynamics of Amrasca biguttula biguttula on Bt and Non Bt cotton and its correlation with abiotic factors