The advantages of an economic threshold system for the cotton jassid,Amrasca biguttula(Shir) and the spotted bollworm,Earias vittella(F.) on cotton were evaluated. Two years’ results revealed that under recommended and currently followed practice (schedule spray system), six to eight insecticidal sprays were required to control the cotton jassid and the spotted bollworm, while following an economic threshold system, only one or two insecticidal sprays were required to keep their populations within tolerable limits. The amounts of insecticide and their application costs in the schedule spray system were much higher than in the economic threshold system, but the yield variations of seed cotton between these treatments were statistically insignificant. The benefit:cost ratios were much higher in the economic threshold system than the schedule spray system for both years.