Chemical composition and effect of (L.) mosyakin & clemants essential oil on (D'Orbigny, 1835).

(L.) Mosyakin & Clemants, known as santa maria herb, is a medicinal plant used on pest control and to treat parasitic diseases. Due to its potential for pest control, the aim of this work was to determine the chemical composition of essential oil and evaluate its molluscicidal effect on , which is an intermediate host for the trematode, that is responsible for causing human schistosomiasis. The essential oil extracted from its leaves showed 87% of (Z)-ascaridole and 100% of mortality against at 10 ppm after 24 h of experiment. LC50 and LC90 values were, respectively, 2.40 (1.90-2.99) ppm and 8.75 (6.39-14.12) ppm. essential oil proved to be a promising natural molluscicide against schistosomiasis when compared with commercial products.