Field studies were carried out to survey, population density and importance value of terrestrial molluscs infesting some vegetable and field crops . Survey studies revealed that five species were found infesting different crops in Ismailia and Sharkia governorate. These species were Monacha cartusiana, Cochlicella acuta, Succinea putris, Deroceras leave and Deroceras reticulatum,.The last species was recorded for the first time in Ismailia governorate. Population density were counted on host plants at three districts of Sharkia and Ismailia governorate during two successive growing seasons February to May 2008 and 2009 respectively. Generally, It is clear that the glassy clover snail M. cartusiana was the predominant species on field and vegetable crops. On the other hand population density of land snails differed from host plant to another and also from locality to another. Finally,. The land snail species can be arranged descedingly according to its importance values at Sharkia and Ismailia as follows: M. cartusiana > S. putris > D. reticulatum and M. cartusiana > S. putris > D. reticulatum> D. leave> C. acuta, respectively.