Molluscicidal Activity of SomeSolanumSpecies Extracts against the SnailBiomphalaria alexandrina

Abstract

Background. 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. Method. Solvent extracts of fresh mature leaves of S. nigrum, S. villosum, and S. sinaicum 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. Results. 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. Conclusion. 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.

Plant extracts and compounds for combating schistosomiasis

“…Despite all recent research and development current synthetic molluscicides also raise serious environmental concerns and threats to both human health and income (particularly in areas where fishing is a major source of food and income) due to their lack of specificity (Andrews et al 1982;He et al 2017). Thus, identifying or developing more selective molluscicidal herbal preparations that do not have adverse effects (or at least acceptably weak effects) in non-target aquatic organisms and are biodegradable remains a high priority (El-Sherbini et al 2009).…”

Resource Description and Access (RDA)

“…Sokkal szorosabb az RDA kapcsolata az 1998-ban publikált Functional Requirements for Bibliographic Records (FRBR) elnevezésű ajánlásokkal, 5 ahogy El-Sherbini fogalmaz: "az egész RDA az FRBR-gondolaton alapul". 6 Az FRBR filozófiája az entitások gondolatára és a köztük lévő kapcsolatrendszerre épül. Korábban a katalogizálók csak a megjelenési formákat írták le, figyelmen kívül hagyva a mű és a kifejezési forma szintjét, valamint a köztük lévő összefüggéseket.…”

“…"A katalogizáló tevékenységnek nem az a célja, hogy a könyvet levegyük a polcról, azt meg is kell találnia valakinek.". 7 Ha a katalogizálás legnagyobb eredménye a használók és a könyvtári források közti kapcsolat megteremtése, akkor ezek a változtatások a kapcsolatot könnyebbé, szorosabbá és erősebbé teszik.…”

Potential molluscicidal activity of the aqueous extracts of some plants and their powders against terrestrial snail Monacha obstructa (L. Pfeiffer, 1842) under laboratory and field conditions

“…has been reported by many re searchers) Farag 2017; Ibrahim et al 2022). El-Sherbini et al (2009) studied the molluscicidal activity of Solanum nigrum against Biomphalaria alexandrina (Ehrenberg). They found that extracts from mature leaves of Solanum species exhibited molluscicidal activities.…”