EFFECT OF NEEM EXTRACT, NEEMAZAL T.S. ON TWO LAND SNAIL SPECIES UNDER LABORATORY CONDITIONS

The effect of neem extract (Neemazal T.S.) on the eggs hatchability and adult snails of two land snail species, Monacha cartusiana and Eobania vermiculata as well as its effect on food consumption of Juvenile snails M. cartusiana under laboratory conditions was also evaluated. Results revealed that the hatchability of the two tested snail eggs decreased to reach 50, 42.5% on the highest concentration (400 ppm.), respectively. Regarding the effect of neem extract (Neemazal T.S.) against adult snail Monacha cartusiana mortality percentages reached to 20, 40, 55% in the end of experiment for the three tested concentration 0.625, 1.250 and 2.5%, respectively. Neemazal T.S. exhibited antifeeding effect on the juvenile snails of M. cartusiana. Food consumption reached to 9.6 mg. (after 3 days) for the highest concentration (200 ppm.) compared with 31.9 mg. for untreated juveniles.