Four isolines of cotton differing in leaf (okra vs. normal) and bract (frego vs. normal) types in all combinations were evaluated under four insecticide regimes consisting of two rates of permethrin (.1 vs. .05 a.i./a) at each of two spray intervals (5 day vs. 10 day). The tests were conducted near Baton Rouge in 1983 and 1984. The objectives of the study were to investigate relative effects of leaf and bract isolines on spray penetration and insecticidal efficacy. Data on spray penetration were obtained for the 1983 test only. Paper targets were positioned at three levels within the canopy (upper 1/3, mid-plant, and ground) and the cotton (4 ft. tall) was sprayed with a non-active, purple color, agricultural dye with a J.D. Hy-Cycle sprayer equipped with 12X cone-tip nozzles, delivering 8 gal/a at 40 p.s.i. Cards were evaluated for drops per sq.in. (DPSI) and percent area covered (PAC) using an Immage Analyzer. Okra leaf was found to significantly increase spray penetration as measured by both DPST (64%) and PAC (26%) as an average of replications, insecticide regimes, positions and bract types. Insecticide regimes, bracts and interaction of leaf x bract had nonsignificant effects. Insecticidal efficacy was studied by comparing the isolines for yield, Heliothis spp. damage/population, and boll weevil damage/population at the four insecticide regimes. It was difficult to separate trait effects from increased efficacy, but there was evidence, though nonconclusive, that okra leaf and frego bract may have increased insecticidal efficacy for bollworm control and that frego bract may have increased insecticidal efficacy for boll weevil control.