Survey, population dynamics and importance value of certain land snail species infesting some vegetable and field crops as well as fruit trees ware determined at some localities in Sharkia Governorate. Results revealed that the glassy clover snail Moncha. cartusiana (Muller) and the amber snail, Succinea. putris (linues) were surveyed at Awlad-Sakr and Abo-Kapeer counties. M. cartusiana snails were found with higher density than S. putris. The majority of the examined crops were found with heavy infestation with M. cartusiana snail while S. putris were recorded with moderate or light infestation in the examined localities. Regarding population dynamics, it found that M. cartusiana snail was recorded with high density at the tested winter crops during spring months (March, April and May) as compared with winter or autumn months. Finally, when importance value was determined, it found that frequency occurrence and population density gave different results. The land snail species can be arranged descedingly,according to its importance values as follow: E. vermiculata>, M. cartusiana >, C. acuta, > H. vestalis. It may be useful to combine frequency of occurrence, population density and biomass in the form of importance value.

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Effect of timing application of three pesticides belonging to carbamate group (oxamyl and methomyl) and organophosphorous group (dimethoate) were evaluated against Monacha cartusiana ( Muller)snails under field conditions during three different seasons (Autumn, winter and spring) . Results revealed that the molluscicidal activity of the two tested pesticides oxamyl and m ethomyl fluctuated from season to another. Autumn and spring seasons exhibited the highest molluscicidal activity against M. cartusiana, while dimethoate noticed the lowest one. On contrary, winter season exhibited the lowest molluscicidal activity for the two tested p esticides (oxamyl and methomyl) comparing with the other two seasons (autumn and spring) while dimethoate gave the lowest one. It could be recommended that control of these snails pests must be carried out during autumn season where few number of snails were found in the begging of the breeding season. It could not wait to spring season where the numbers of snails reach its maximum values.

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