author(s)
Zunnu Raen Akhtar, Zain Saeed, Ahmad Ali Anjum, Hasooba Hira, Arbab Ihsan, Aqsa Noreen and Muhammad Abubakar Salman

abstract
An experiment was conducted on pink boll worm larvae reared on sprayed Bt cotton as compared to sprayed non-Bt cotton. Pesticide used was triazophos which was sprayed in bioassay on Bt cotton as compared to non-Bt control. Varieties used for bioassay of pink boll worm wereFH-146 and FH-Lalazar as compared to control MNH-786.Three concentrations including low, standard and high were used for bioassay. Results found that there was less mortality of pink boll worm when sprayed lower concentration of pesticides on FH-146 and FH-Lalazar as compared to control. While there was medium mortality of pink boll worms on standard concentration on FH-146 and FH-Lalazar as compared to control. Higher mortality was observed in higher concentration sprayed Bt cotton as compared to control variety. As conclusion it can be asserted that if spray Bt cotton infested with pink boll worm can result in better control and can result in higher yield.