Phytochemical Screening and Effectiveness of Alstonia boonei De Wild oils as an Entomocides in the Management of Cowpea Bruchid, Callosobruchus maculatus (Fab.) [Coleoptera: Chrysomelidae].  

Kayode David Ileke1 , Olusola Olasunmbo Odeyemi2 , Michael Olufemi Ashamo2
1.Department of Environmental Biology and Fisheries, Faculty of Science, Adekunle Ajasin University, PMB 001, Akungba Akoko, Ondo State, Nigeria
2.Food Storage Technology Programme, Department of Biology, School of Science, Federal University of Technology, PMB 704, Akure, Ondo State, Nigeria
Author    Correspondence author
International Journal of Horticulture, 2014, Vol. 4, No. 6   doi: 10.5376/ijh.2014.04.0006
Received: 05 Mar., 2014    Accepted: 25 Mar., 2014    Published: 28 Mar., 2014
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Preferred citation for this article:

Ileke et al., 2014, Phytochemical Screening and Effectiveness of Alstonia boonei De Wild oils as an Entomocides in the Management of Cowpea Bruchid, Callosobruchus maculatus (Fab.) [Coleoptera: Chrysomelidae], International Journal of Horticulture, 2014, Vol.4, No.6 24-31 (doi: 10.5376/ijh.2014.04.0006)

Abstract
Oils prepared from Alstonia boonei De Wild were tested as entomocide in the management of cowpea bruchid, Callosobruchus maculatus (Fab.) [Coleoptera: Chrysomelidae].The oil of A. boonei stem barkhad the highest mortality of 100% after 4 days of application at all level of concentrations tested. The survival of the cowpea bruchid from egg to adult when treated with the plant oils showed significantly greater mortality. Oils of  the tested plant were toxic to adult insects and also prevent adult emergence of C. maculatus. The phytochemicals present in the petroleum ether extracts of A. boonei leaf, stem bark and root were identical. Flavonoids is absent in A. boonei leaf and root but present in A. boonei stem bark and this may be responsible for it high insecticidal property. The effectiveness of the plant could be arranged in this order of efficacy thus; stem bark oil>leaf oil>root oil.
Keywords
Callosobruchus maculate; Adult emergenc; Soxhlet extraction, Entomocide; Alstonia boonei; Phytochemicals
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