Journal of the Egyptian Society of Parasitology, Vol. 39, No. 1, April 2009 J. Egypt. Soc. Parasitol., 39 (1), 2009: 121-139 A STUDY ON BIOLOGICAL CONTROL OF SIX FRESH WATER SNAILS OF MEDICAL AND VETERINARY IMPORTANCE By KARIM F. ABD-ALLAH1, MOHSEN M. NEGM-ELDIN2, MOHAMED H.SALEH1, AZZA M.S. EL-HAMSHARY1, BOTHINA M.R. EL-GOZAMY3 AND NAGWA S.M. ALY1. Departments of Parasitology, Faculties of Medicine13 and Veterinary2 Medicine, Benha University12, Benha, and Ain Sbams University, Cairo 115663 Egypt Abstract This study evaluated the moUuscicidal effect of Commiphora molmol oil extract (Myrrh), on control of six fresh water snails (Lymnaea natalensis, Bu¬linus truncatus, Biomphalaria alexandrina, Physa acuta, Melania tuberculata and Cleopatra bulimoides). Also, the extract effect on the egg masses of L na¬talensis, B. truncatus, B. alexandrina and Ph. acuta was evaluated. Snails and egg masses were exposed at 16-20°C to various concentrations (cone). LD50 after 24 hours expo-sure were 264/132, 283/195, 230/252, 200/224, 241/246 & 241/246 ppm for young/adult of L natalensis, B. truncatus, B. alexandrina, Ph. acuta, M. tuberculata and C. bulimoides respectively. LDJOO after 24 hours ex¬posure were 400/400 for L natalensis, B. truncatus, B. alexandrina, M. tuber¬culata and C. bulimoides, and 300/300 for Ph. acuta. Also, complete mortality (100%) was achieved for the egg masses of L. natalensis, B. truncatus, B. alex¬andrina and Ph. acuta at concentrations of 300, 200, 300 & 400 ppm respec¬tively. Lower concentrations gave the same results after longer exposure. LDioo of C. molmol oil extract (Myrrh) had a rapid lethal effect on the six snail species and their egg masses in high cone, of 300 & 400 ppm. Commiphora molmol is a promising plant to be included with the candidate plant mollus-cicides. The oil extract of this plant showed a remarkable moUuscicidal activity against used snail species. Key words: Commiphora molmol oil extract, moUuscicidal effect, egg masses, young and adult of Lymnaea natalensis, Bulinus truncatus, Biomphalaria alex¬andrina, Physa acuta, Melania tuberculata and Cleopatra bulimoides. |
