Present research was carried out to evaluate the comparative efficacy of five new insecticides viz., diafenthiuron (polo 50%SC), thiamethoxam (actara 25%WG), acetamiprid (diamond 20%SP), imidacloprid (confider 20%SL) and thiacloprid (calypso 24% OD) at field recommended doses against jassid, Amrasca devastans on cotton variety Bt- 121 grown at farmer field Chak No. 253/R.B, Faisalabad. Insecticides sprayed when population of jassid reached to economic threshold level (ETL) i.e., 1- 1.5/leaf. The data regarding mean number of jassid per leaf was taken and converted in to mean percentage mortality to find out differences among the treatments. The results of present study showed that lmidacloprid, diafenthiuron, acetamiprid and thiamethoxam were most effective insecticides against jassid up to seven days after application. While, lmidacloprid and diafenthiuron gave maximum mortality during first spray (92.42 and 88.56%) and second spray (90.87 and 85.67%) after 72 h of application.