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dc.contributor.authorGitahi, Stephen Maina
dc.contributor.authorNgugi, Mathew Piero
dc.contributor.authorMburu, David Nganga
dc.contributor.authorMachocho, Alex Kingori
dc.date.accessioned2021-09-21T05:32:46Z
dc.date.available2021-09-21T05:32:46Z
dc.date.issued2021
dc.identifier.citationGitahi, S. M., Ngugi, M. P., Mburu, D. N., & Machocho, A. K. (2021). Contact Toxicity Effects of Selected Organic Leaf Extracts of Tithonia diversifolia (Hemsl.) A. Gray and Vernonia lasiopus (O. Hoffman) against Sitophilus zeamais Motschulsky (Coleoptera: Curculionidae). International Journal of Zoology, 2021.en_US
dc.identifier.issn1687-8477
dc.identifier.urihttps://downloads.hindawi.com/journals/ijz/2021/8814504.pdf
dc.identifier.urihttp://ir-library.ku.ac.ke/handle/123456789/22546
dc.descriptionA research article published in International Journal of Zoologyen_US
dc.description.abstractMaize weevil (Sitophilus zeamais) infestation results in a substantial reduction in the quantity and deterioration of the quality of stored maize. Most farmers control weevils using conventional pesticides which are usually associated with several human health risks as well as intoxication of the fauna and flora. However, bioinsecticides form an alternative intervention since they possess fewer side effects on human health, are ecofriendly, and are readily available. 'is study sought to validate and document, in a systematic way, the pesticidal properties of the species Tithonia diversifolia and Vernonia lasiopus used for many years by many people of the world on S. zeamais. 'e plant leaf samples were obtained from Embu County, Kenya. Dichloromethane and ethyl acetate solvents were used to extract active phytochemicals from the dried plant sample powder. 'e GC-MS analysis of the obtained extracts was performed at ICIPE laboratories to identify their phytochemical compositions. Twenty grams of maize grains were put in 50 ml plastic vials and admixed with different treatments. 'e positive control group was treated with Actellic Super™, while the negative control was treated with the respective extracting solvent only. 'e experimental groups were separately treated with the plant leaf extracts at doses of 25, 50, 75, and 100%. After treatment, each of the six groups was infested with 10 male S. zeamais and weevil mortality as a result of contact toxicity of the treatments was assessed at 6, 24, 48, 72, and 96 hours after the insects were exposed to the extracts. Results of the study indicate that the selected organic leaf extracts of T. diversifolia and V. lasiopus possessed significant contact insecticidal effects that ranged between 1.67 to 99.98%. Furthermore, the GC-MS analysis revealed several active biocompounds in T. diversifolia and V. lasiopus extracts, which are known for their considerable insecticidal effects. Our data suggest that the organic leaf extracts of T. diversifolia and V. lasiopus have considerable insecticidal properties and would, therefore, be a valuable bioprotective agent for stored maize grains against S. zeamais.en_US
dc.language.isoenen_US
dc.publisherHindawien_US
dc.subjectLeaf Extracts of Tithonia diversifoliaen_US
dc.subjectTithonia diversifoliaen_US
dc.subjectVernonia lasiopusen_US
dc.subjectS. zeamaisen_US
dc.subjectEmbu Countyen_US
dc.subjectKenyaen_US
dc.titleContact Toxicity Effects of Selected Organic Leaf Extracts of Tithonia diversifolia (Hemsl.) A. Gray and Vernonia lasiopus (O. Hoffman) against Sitophilus zeamais Motschulsky (Coleoptera: Curculionidae)en_US
dc.typeArticleen_US


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