Snails' species are associated with transmission parasitic disease as intermediate
host. Biological control stands to be a better alternative to the chemical controls
aimed against snails. The search of herbal preparations that do not produce any adverse
effects in the non-target organisms and are easily biodegradable remains a top research
issue for scientists associated with alternative molluscicides control. Solvent extracts
of fresh mature leaves of Solanum nigrum L., S. villosum Mill., and S. sinaicum Boiss. were tested against Biomphalaria alexandrina, a common intermediate host of Schistosoma mansoni. A phytochemical analysis of chloroform: ethanol extract was performed to search
for active toxic ingredient. The lethal concentration was determined. Extracts isolated
from mature leaves of Solanum species were found to be having molluscicidal properties. S. nigrum extract was recorded
as the highest mortality rate. When the mortality of different solvent extracts was
compared, the maximum (P<.05) mortality was recorded at a concentration of 90 ppm
of ethanol extract of S. nigrum. Extract of mature leaves of S. nigrum exhibited molluscicidal activity followed by S. sinaicum and the less one was S. villosum. The study provides considerable scope in exploiting local indigenous resources for
snails' molluscicidal agents.
Acknowledgement:
The authors thank all the participants who shared their time for working on this
study.
References: Ahmed AH, Kamal IH, and Ramzy RM (2001) Journal of the Egyptian Society of Parasitology,
31(3): 843–852.
Massoud AM and Habib FS (2003) Journal of the Egyptian Society of Parasitology, 33(2):
585–596.
