Adults of Rhyzopertha dominica were treated by filter paper impregnation method with five doses of pesticides of different groups such as cypermethrin, lorsban, Acorus calamus extract, trend and shogun, and LC50 was calculated. Biochemical analysis revealed that after treatment with LC50 of pesticides, cypermethrin inhibited 80% alkaline phosphatase activity, lorsban 44.17%, A. calamus extract 49.87%, trend 25% and shogun inhibited 20% activity as compared to control. Acid phosphatase activity was inhibited upto 42.8%, 11.12%, 14.25%, 28.62% and 33%, respectively. Similarly, cholinesterase...