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The comparative efficacy of malathion and Argemone mexicana extract against armored scale, Abgrallaspis cyanophylli (Signoret) incidence on Psidium guajava plants were studies in field. The above insecticide and plant extract tested against this pest on heavily infested plant of Psidium guajava orchard in different month of year which is located at Hasanapur Agra. The insecticides and plant extract were sprayed on different groups of Plant with knapsack sprayer after spray the counting of the living and dead stages of the pest has been done by the sampling counting method. The plant’s product was found to be less toxic as compared to synthetic Pesticide. The synthetic pesticide is harmful for environment than plant product extract.