Ovicidal and Larvicidal Effects of Ricinus communis L. (Euphorbiaceae) Extracts on Phlebotomus duboscqi

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dc.contributor.authorMong’are, Samuel
dc.contributor.authorNg’ang’a, Zipporah
dc.contributor.authorNgumbi, Philip
dc.contributor.authorIngonga, Johnstone M.
dc.contributor.authorNgure, Peter
dc.date.accessioned2024-05-08T13:11:04Z
dc.date.available2024-05-08T13:11:04Z
dc.date.issued2015-11-07
dc.description.abstractAims: To evaluate the Ovicidal and larvicidal effects of Ricinus communis (Euphorbiaceae) extracts on Phlebotomus duboscqi. Study Design: A comparative experimental design using extracts obtained from the leaf and bark of Ricinus communis plant. Study Site: Kenya Medical Research Institute, Centre for Biotechnology Research and Development (CBRD), Nairobi Kenya from January to July, 2015. Methodology: Aqueous, methanol and ethyl acetate extracts were prepared from Ricinus communis plant. Freshly laid eggs were moistened with 1 ml of each extract separately during the incubation period. Larvae were also fed on larval food mixed with the powdered crude extract and a second group was fed on larval food sprinkled with 5 ml of each extract daily. Results: No significant difference when bark and leaf extracts were compared (P=0.061). 250 μg/ml and 500 μg/ml of extract eroded all the chorionic membranes of the egg shell while egg hatchability was significantly inhibited with only 7%, 9% and 26% of eggs hatching at 500 μg/ml of aqueous, methanol and ethyl acetate extracts respectively (P<0.001). 100% larval mortality noted when at 500 μg/ml methanol extract. The larval period was prolonged to 87 days with the life cycle lasting for 101 days. Conclusion: R. communis extracts have deleterious effects on hatching of eggs, larval and pupal development and adult emergence of P. duboscqi; hence R. communis should be used against sand flies and Leishmania in situ.
dc.description.sponsorshipJomo Kenyatta University of Agriculture and Technology, P.O.Box 62000, Nairobi, Kenya. South Eastern Kenya University, P.O.Box 170-90200, Kitui, Kenya. Kenya Medical Research Institute, KEMRI, P.O.Box 43640 – 00100 Nairobi, Kenya. Technical University of Kenya, P.O.Box 52428-00200, Nairobi, Kenya. African Population and Health Research, P.O.Box 10787-00100, Nairobi, Kenya.
dc.identifier.issn2231-0894
dc.identifier.urihttps://repository.daystar.ac.ke/handle/123456789/4563
dc.language.isoen
dc.publisherEuropean Journal of Medicinal Plants
dc.relation.ispartofseries11(3): 1-14, 2016; EJMP.22241
dc.subjectP. duboscqi
dc.subjectRicinus communis
dc.subjectovicidal
dc.subjectlarvicidal
dc.subjectmortality
dc.subjectsculpturing.
dc.titleOvicidal and Larvicidal Effects of Ricinus communis L. (Euphorbiaceae) Extracts on Phlebotomus duboscqi
dc.typeArticle

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