[the use of the shell of the cashew nut, anacardium occidentale, as an alternative molluscacide].bioassays using hexanolic extracts of cashew nut shells, of anacardium occidentale, collected in ceará in 1972 (sample 1) and 1987 (sample 2) were undertaken with adult snails and egg masses of biomphalaria glabrata, b. tenagophila and b. straminea both in the laboratory and in the field. non extracted shells, 18.5 g, sample 1, were also tested with adult snails and egg masses of the three species. the toxicity of extract was tested with fish (poecilia reticulata) and tadpoles. the lethal concen ...19921342111
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