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dc.contributor.authorHassanali, Ahmed
dc.contributor.authorWekesa, I.
dc.contributor.authorOnek, L. A.
dc.contributor.authorDeng, A. L.
dc.contributor.authorOthira, J. O.
dc.date.accessioned2014-01-22T13:12:51Z
dc.date.available2014-01-22T13:12:51Z
dc.date.issued2011-06
dc.identifier.citationJournal of Stored Products and Postharvest Research Vol.2(6) , pp. 113-119 , June 2011en_US
dc.identifier.issn2141-6567
dc.identifier.urihttp://ir-library.ku.ac.ke/handle/123456789/8804
dc.description.abstractBush mint, Hyptis spicigera has been used traditionally as a cereal and legume protectant against storage insect pests. The objective of this study was to evaluate the toxic and repellant activity of H. spicigera extracts against Sitophilus zeamais, a major insect pest of stored cereal grains in the tropics. Essential oils and solvent extracts were tested against the maize weevil in fumigation, contact and repellence bioassays. Results obtained showed that essential oils had strong fumigant toxicity against S. zeamais with a LC50 value of 48.11 µL/l air at 48 h. Contact toxicity assay gave more than 50% mortality at 48 h of exposure for methanol extracts and not hexane extracts. Hexane extracts had higher repellant activity than the methanol extracts at the same dosage. GC-MS revealed that essential oils is composed of at least fifteen mono- and sesquiterpenoids, with the major constituents being α-pinene (27.4%), β-pinene (17.6%), L-phellandrene (12.2%), α-thujene (12.2%), isocaryophyllene (9.2%), and limonene (9.4%). Bush mint may be exploited for the development of botanical insecticides to be used in weevil management.en_US
dc.language.isoenen_US
dc.publisherJournal of Stored Products and Postharvest Researchen_US
dc.subjectHyptis spicigeraen_US
dc.subjectessential oilen_US
dc.subjectsolvent extracten_US
dc.subjectpesticidal potencyen_US
dc.subjectSitophilus zeamaisen_US
dc.titleToxicity and repellant potency of Hyptis spicigera extracts on Sitophilus zeamais motschulsky (Coleoptera: Curculionidae)en_US
dc.typeArticleen_US


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