Toicity of neem (Azadirachta Indica a, juss) Leaf extracts on fresh water snail, Bellamya bengalensis (Lamarck, 1882)

Present study was undertaken to determine toxicity of crude leaf extracts of neem (Azadirachta indica A. Juss) on freshwater snail, Bellamya bengalensis Lamarck, 1882. The values of median lethal concentration (LC₅₀) for 24, 48, 72 and 96 h were estimated as 15.663, 13.202, 9.539 and 7.902 g/L respectively. The mortality of snails was significantly increased with increasing concentrations of neem extract and the time of exposure. Behavioral changes with respect to crawling, , tentacle movement, clumping tendency, touch reflex and mucous secretion were noticed in the snails exposed to neem leaf extract.