field experiment was carried out during April, 2014 in pear orchard at Ismailiya Governorate to evaluate the efficiency of four insecticides against the pear psyllid, Cacopsylla Agricola (Foerster) (Hemiptera: Psylloidea, Psyllidae) on pear trees. Obtained results showed that the tested insecticides were highly effective in the insect population. The statistical analysis of the nymphal reduction population showed that Acetamiprid was the most efficient compound (97.2%) followed by Phosmet (97.1%), Mineral oil (93.0%) and Pyriproxyfen (92.8%). Also, Acetamiprid was the highest effective insecticides in the adult population showing (96.7%) followed by Pyriproxyfen (95.6%) then Phosmet (94.8%) and Mineral oil (92.9%), respectively. The reduction of the insect population reached its maximum by the 5 th week, by more than (97.0%) for the nymph and adult populations. The obtained results revealed that the post-spraying must continue 5 weeks after application to reach the efficiency of the evaluated insecticides for controlling the pear psyllid, C. Agricola on pear trees.