Abstract
Biomphalaria alexandrina snails play a central role in transmission of schistosomiasis. The present study evaluates the molluscicidal effect of two plants as aqueous suspensions, Cestrum diurnum and Casimiroa edulis. LC50 values were 66 and 195 ppm, respectively after 24 hours. Exposure of snails to sub-lethal concentrations of C. diurnum and C. edulis resulted in significant alterations in the activities of some haemolymph enzymes (alanine aminotransferase, aspartate aminotransferase and alkaline phosphatase). The digestive gland cells were highly vacuolated in all tested concentrations. The secretory cells were atrophied and degenerated at LC25 of C. diurnum, while in snails treated with LC0 of C. edulis; they were densely colored without differentiation between nucleus and nucleolus.
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