The seasonal abundance of three injurious land snail species, Theba pisana (Müller), Helicella vestalis (Pfeifer) and Monacha obstructa (Férussac) (Pulmonata: Helicida) on pear trees was monitored during two successive years from December 2012 up to or till November 2014 in AL-Amriah region at Alexandria Governorate. The results showed that the more or less higher means numbers of T. pisana were recorded during the elapsed period of March-Aug. in the first year and Feb.-July in the second one. More ever, the higher means numbers of H. vestalis and M. obstructa were recorded during the lasted periods of March-June and March-May respectively, in both following years. These data revealed that T. pisana was the most abundant snail in the inspected orchards during the experimental period. In concern to the performed chemical control, the obtained results exhibited the comparative higher and faster molluscicidal activity of methomyl and/or methomyl/boric acid and mixture against T. pisana than boric acid alone.