الفهرس 
Shell diameter
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Abstract
Recently, land snails are considered one of the most destructive agricultural pests causing economic damage to a wide variety of plants including horticulture, field crops and forestry. In addition to their medical and veterinary importance, since they serve as intermediate hosts for certain parasitic worms of man and his domestic animals (Godan, 1983).
In Fgypt, the destructiveness of land snails is far greater today than in former times (Kassab and Daoud, 1964; El-Okda, 1983 and Abd Allah et ai, 1992). Their spread are greatly differed from place to another depending on food supply and weather conditions (Mahrous, 2002).
Many plants are subjected to snails attack, particularly at the peak of their activity which occur during spring (E\-Deeb el aL, 1996). They attack leaves, buds, flowers and even the trunk of trees and cause a great damage to vegetables, ornamentals, shrubs and a wide variety of crops, fruits and other plants in most of the areas of their distribution (Malec, 1985 and EI-Deeb etai, 1999).