Abstract One test was conducted to evaluate the efficacy of selected insecticides against cotton aphids in non-irrigated no-till cotton planted 5 May. Plots consisted of 3 rows (40 inch centers) X 45 ft. Treatments were arranged in a RCB design with 4 replications. No insecticides had been previously applied to the test area. Treatments were applied 21 Jun. Insecticides were applied with a hand-boom and compressed air system calibrated to deliver 10 gpa through Teejet 80015 flat fan nozzles (2/row) at 25 psi. Treatment efficacy was evaluated by sampling five terminals (all apical shoot growth above and including the first fully expanded leaf) from each plot at 3, 7, 10, and 14 DAT. Treatments were evaluated on 24, 28 Jun and 1, 5 Jul. Cotton aphids were washed from the plant foliage onto 300 mesh wire sieves, backwashed onto ruled filter paper (7 cm), and counted using a binocular dissecting scope. These plots received 0.03 and 0.08 inch rainfall on 22 and 24 Jun, respectively. Data were analyzed with ANOVA, and means were separated according to DMRT.