Mortality of imported entomopathogenic nematodes, Heterorhabditis bacteriophora (HP88),H. indica, and Steinernema carpocapsae (All) compared with local EPNs isolates, H. bacteriophora   (Ar-4), H. bacteriophora (Serag1), and H. bacteriophora (Ht) alone or combined with the recommended dose of abamectin and fenamiphos on juvenile mortality percentages of two land snail species, Eobania vermiculata (Müller) and Monacha cartusinana (Müller) have been studied in a series of laboratory experiments.
            Results exhibited that, mortality percentages and combined effect in the two land snail species were obviously influenced by EPNs species/strains, concentrations and exposure time. Among EPNs, H. bacteriophora HP88, H. indica, and H. bacteriophora (Ar-4) achieved the highest means of mortality percentages (66.67 & 70.0, 65.33 & 68.67 and 54.67 & 62.0 %) after three weeks of exposure with E. vermiculata and M. cartusinana. Whereas, S. carpocapsae (All) achieved the least mortality means (46.0 & 49.33 %) respectively.
            On the other hand, application of 500 IJs of EPNs conjunction with RD of abamectin and fenamiphos surpassed use EPNs or RD alone to reach (69.00, 70.00, 62.67 %), in fenamiphos and abamectin reached 71.33, 67.33 and 62.67 % in E. vermiculata with H. bacteriophora HP88, H. indica and H. bacteriophora (Ar-4), respectively.
           While the parallel values with M. cartusinana were 81.33, 84.00, 76.00 % in fenamiphos treatments and 72.00, 46.67, 67.33 % with abamectin treatments. CF of the tested EPNs with nematicides and their response varied according to periods of exposures. Synergistic and additive effects were exposed with EPNs and tested nematicides after one week, whereas additive or antagonistic effects were recorded after two and three weeks with examined land snail species.