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Abstract
The molluscicidal activity of bark powder of Saraca asoca, leaf powder of Thuja orientalis
against the snail Lymnaea acuminata was studied. The molluscicidal activity of all
the plant products was found to be both time and concentration dependent. The 96 h
LC(50) of T. orientalis leaf powder against L. acuminata was 250.5mg/l. Ethanol extracts
were more toxic than other organic extracts. The ethanol extract of T. orientalis
leaf (24h LC(50): 32.74 mg/l) was more effective than that of S. asoca bark (24h LC(50):
82.38 mg/l). The 24h LC(50) of column purified fraction of T. orientalis leaf and
S. asoca bark powder was 29.25 and 64.89 mg/l, respectively. Saponin and thujone were
identified as active molluscicide components in the bark of S. asoca and leaf of T.
orientalis, respectively. The product of S. asoca and T. orientalis may be used as
potent molluscicides.