Experiments were conducted under laboratory conditions to study certain biological aspects of the pink bollworm, Pectinophora gossypiella (Saund.), and (predacious insect) eleven spotted ladybird, Coccinella undecimpunctata (L.), when adult stage treated by half recommended concentrations of Emamectin benzoate, Lufenuron, and Chlorpyrifos. The mean numbers of deposited eggs were 103.0, 142.7, and 70.0 eggs/female treated by three compounds, respectively compared with 234.0 eggs/females in control. All treatments caused increased in the time required for all developmental stages of P. gossypiella resulted from adults' treatment with the three insecticides; in addition, total immature stage, life cycle, and generation time were increased in all treatments than control. Also, data recorded that emamectin benzoate, lufenuron, and chlorpyrifos; reduced the predator eggs hatchability to 56.0, 61.0, and 48% compared with 98.0% in control.  On the other hand, data recorded that effect of three compounds on C. undecimpunctata (predacious insect), mean numbers of deposited eggs (fecundity) were 126.0, 133.0 and 99.0 eggs/female when the predacious insect treated by the three compounds, respectively, compared with 190.0 eggs/female in control.