Comparative Efficacy of new Insecticides against Whitefly, Bemisia tabaci (Genn.) and Jassid, Amrasca devastans (Dist.) on Cotton, Bt-121

The study was conducted to determine comparative efficacy of new insecticides against whitefly, Bemisia tabaci (Genn.) and jassid, Amrasca devastans (Dist.) on cotton Bt- 121 grown at farmer field on 25 th May, 2009 at Chak No. 253/R.B, Faisalabad. The insecticides viz., diafenthiuron (polo 50%SC), thiamethoxam (actara 25%WG), acetamiprid (diamond 20%SP), imidacloprid (confidor 20%SL) and thiacloprid (calypso 24% OD) at the rate of 200 ml, 24gm, 125gm, 250ml and 250ml/ acre, respectively, were sprayed when population of whitefly and jassid reached to economic threshold level (ETL) i.e. jassid 1-1.5/ leaf and whitefly 4-5/ leaf. Imidacloprid, diafenthiuron, acetamiprid and thiamethoxam proved to be the most effective insecticides against whitefly up to seven days after application. While, Imidacloprid, diafenthiuron and acetamiprid proved to be the