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Effect of Commiphora molmol on adults, egg masses and egg-deposition of Biomphalaria arabica under laboratory conditions.

Commiphora molmol (Myrrh) has molluscicidal effect on Biomphalaria arabica snails at low concentration (40 ppm) after 48 hours exposure. The number of dead-snails increased with increasing the time of exposure. One day-old egg masses were more susceptible (death 100% with 80ppm) to the ovicidal effect of C. molmol than the five-day old ones (Death 95% with 80ppm). However, the eggs were more resistant to the C. molmol effect than the adult snails, embryogenesis began to stop at 20 ppm and eggs were all killed at 60 & 80 ppm. B. arabica fecundity decreased at 1 ppm. Based on safety to man and animals, C. molmol is recommended as a safe molluscidide.