Research Report

Biotoxic Efficacy of Different Fractions of Acalypha godseffiana Oil Extract against Callosobruchus maculatus Infesting Stored Cowpea  

M. O. Oni1 , O. C. Ogungbite2 , T. I. Ofuya1
1 Department of Crop, Soil and Pest Management, Federal University of Technology, Akure, P. O. Box 704, Akure, Nigeria
2 Department of Plant Science, University of Ado-Ekiti, Ado-Ekiti, Nigeria
Author    Correspondence author
Medicinal Plant Research, 2018, Vol. 8, No. 2   doi: 10.5376/mpr.2018.08.0002
Received: 31 Jul., 2017    Accepted: 15 Jan., 2018    Published: 27 Feb., 2018
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This is an open access article published under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Preferred citation for this article:

Oni M.O., Ogungbite O.C., and Ofuya T.I., 2018, Biotoxic efficacy of different fractions of Acalypha godseffiana oil extract against Callosobruchus maculatus infesting stored cowpea, Medicinal Plant Research, 8(2): 8-13 (doi: 10.5376/mpr.2018.08.0002)

Abstract

The insecticidal efficacy of different fractions of Acalypha godseffiana was studied under the laboratory conditions at ambient temperature of 28±2°C and relative humidity 75±5%. The oil of the plant was fractionated into different fractions of 2; 3; 4; 5; 6 and 7 was tested for its insecticidal activity against Callosobruchus maculatus (F.) at 50; 60; 70; 80 and 90 µl dosages. All the fractions showed high insecticidal efficacy against the insect. However, fraction 3 and 4 appeared to be the most effective as they were the only fractions that achieved 100% weevil mortality within 72 hours of application. The probit analysis showed that fraction 4 of the oil extract of this plant had the highest mortality effect on the insect as only 5.57 and 11.68 µl was required to achieve 50 and 95% insect mortality within 72 hours respectively. In addition, the characterization of the active compound of the two fractions (3 and 4) as well their toxicology study is still going on. However, since the fractions have shown high insecticidal effect against the survival of the adult C. maculatus, they could be introduced into pest management strategies.

Keywords
Repellency; Toxicity; Callosobruchus maculatus
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