Common pistachio psylla (CPP), Agonoscena pistaciae is a key pest of pistachio gardens. In the current situation, chemical control is the effective method of control for reduces the damage of this pest in pistachio gardens. The use of different insecticides in gardens has made the pest resistant. The purpose of this study, is investigate the effect of several pesticides on CPP. In order to investigate the effect of insecticides on the mortality of this pest, two separate experiments were conducted in 2014 in a randomized complete block design with four treatments and four replications. The treatments included spirotetramate 0.5*1000, Euforia® 0.3 *1000, Sumithion® 2 *1000 and water as control treatment. Sampling of leaf was done one day before of spraying and 2, 7, 14, 21 and 30 days after spraying. In each sampling the 5 complete leaves from each tree was selected and total number of leave nymph were countered. Data were corrected by Handerson-tilton formula and analyzed by SPSS software. In the 2 days after spraying, no significant difference was observed in the average percentage of treatments effect. The highest mean of mortality (%) was observed in spirototetramate (99.24 ± 0.06) in 7 days after spraying. The average percentage of effect of Euforia and Sumithion in this time were (90.22 ± 0.14 and 85.12 ± 0.17) respectively. Mean comparison of percentage effect of insecticides on 14 days after spraying showed that spirototetramate and euphoria were 87.38 ± 0.25 and 99.75± 0.03, respectively, which compared to Fenitrothion (49.43 ± 0.56) have the higher efficacy on common pistachio psylla. At 21 and 30 days after spraying, the effect of spirototetramate was more than other treatments.