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This study was conducted on the land snail Monacha cartusiana to determine the influence of four different degrees of temperature (18, 20, 22 and 24 0C) treated with four levels of soil moisture (25,50,75 and 100% field capacity) on egg hatching and developmental period and to define the activity of snails during aestivation and food consumption under the effect of seven temperature degree ranges (5,10,15, 20,  25,30 and 350C) under laboratory conditions. The present data revealed that the optimum temperature (220C) for the highest percent of egg hatching was (78 and 76%) treated with 75 and 100% of soil field capacity and the shortest incubation and hatching period were 4.6 and 0.8 days at 240C with 75% soil moisture and at 200C with 50% soil moisture, respectively.  Food intake by M. cartusiana on cabbage leaves was directly related to temperature and the land snail sizes. Feeding was maximal at 20 and 35 0C for juveniles (8-9, 10-11mm) and at 5 and 35 0C for all sizes of adults. All juveniles sizes showed higher food intake rate (general mean,31.14mg) than the adult sizes (general mean,30.20mg), as it increased by increasing only the shell size of all juveniles indicated by the general mean which could be arranged in an ascending order as follows,29.03, 31.04 and 33.37 mg for the size of (8-9), (9-10) and (10-11 mm), respectively, during three days. When the aestivated snails were exposed to serial levels of temperature degrees (starting from 10 to 400C,15 to 400C, 20 to 400C, 25 to 40 0C and 30 to 400C), were more active (19.2, 50, 17.2, and 3.6%) at temperature 25 0C and became less active with increasing temperature (0.4, 6.4, 7.6, 5.6 and 4%) at 40 0C. By the end of the experiment, all the aestivated snails become epiphragmed and only died when exposed suddenly to a lower temperature, while it still alive when exposed to higher temperature.

journal of plant protection and pathology /journal of plant protection and pathology

Some Ecological Factors Influencing Egg Hatching, Incubation Period, Food Consumption and Aestivation of Monacha cartusiana Snails Under Laboratory Conditions