الفهرس 
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Abstract
fruit trees, so it was important to get information about them concerning their ecology and different biological control methods. In this study, extensive survey was carried out on land snails infesting field crops, vegetables and fruit trees in Sharkia Governorate during two successive years stated from March 2008 to Feb. 2009. The survey resulted in six species of terrestrial snails belonging to order pulmpnata were distributed at different districts in Sharkia Governorate. These species were the glassy clover snail , Monacha cartusiana Müller ; the Kentish snail , the small sand snail , Helicella vestalis( Preiffer) ; the brown garden snail, Eobania vermiculata (Müller) ; the conical snail, Cochlicella acuta(Müller) , and this study concerned on the determination of population density of thees snails on field crops , vegetable crops and fruit trees . The population dynamics of the land snail, H. vestalis is studied on fruit trees as , guava , mango, navel orange during the period from March 2008 to February , data indicated that the snail , H. vestalis infest the fruit tree guava, mango , navel orange , orchards throughout the year months . The population recorded that the maximum number was (17.6) on guava at May at 26.1 T0c, and 64.8 RH, on mango (25.1) on September at 35.5T0c and (66.7) RH. and and recorded ( 27.6) on navel orange on August at 30.9T0c and 60.1 RH also the population dynamics of E. vermiculata was done on the fruit trees , and studying the Food consumption and damage caused by H. vestalis and E.vermiculata on leaves of certain host plants. In the present study we used microbial control to land snails as alternatives to chemical control by using two bacterial isolates of Bacillus thuringiensis with three methods of application and four strains of E. Coli under laboratory condition also the green muscle fungus, Metahrizium anisopliae var acridum was used on two concentrations 5× 1010 and 2.5 ×1010 and that under laboratory and field conditions which caused high mortality percent on the two snails , H. vestalis and E.vermiculata, and so B.t. and M. anisopliae var acridum are excellent biological control of land snail.