AbstractThe effect of the insecticide endosulfan on the predatory efficiency of the green lacewing,Chrysoperla carneaStephens (Neuroptera: Chrysopidae) on the eggs of tobacco budworm,Heliothis virescens(Fabricius) (Lepidoptera: Noctuidae) and fall armyworm,Spodoptera frugiperda(Smith) (Lepidoptera: Noctuidae) was measured with Holling’s disc equation. Though the type II functional response was maintained inC. carneaexposed to endosulfan, the functional response parameters: attack rate (a′), handling time (Th), total handling time (Tht), searching time (Ts), and search efficiency (E) were affected for both prey offered. The predator took more time to identify, pursue, capture, consume, and digest the prey, and in general, the efficiency of the predator as a biological control agent was adversely affected.