Volume 3, Issue 2, June 2019, Page: 30-35
Impact of a Local Nigerian Rice Variety and Wheat on the Tolerance of Geographical Strains of Sitophilus oryzae to Dichlorvos
Olajire Ayodele Gbaye, Biology Department, Federal University of Technology, Akure, Nigeria
Emmanuel Ayobami Oyeniyi, Biology Department, Federal University of Technology, Akure, Nigeria
Muyideen Folorunsho, Biology Department, Federal University of Technology, Akure, Nigeria
Graham Holloway, Centre for Wildlife Assessment and Conservation, School of Biological Sciences, University of Reading, Berkshire, UK
Received: Mar. 30, 2019;       Accepted: May 5, 2019;       Published: Jun. 10, 2019
DOI: 10.11648/j.aje.20190302.11      View  22      Downloads  12
Abstract
Rice weevil, Sitophilus oryzae, a cosmopolitan pest of stored cereals (including wheat and rice) is moved around inadvertently through global cereal trade. In this study, we consider the effect of strain origin and host food on the tolerance of S. oryzae to dichlorvos, a common insecticide used to protect stored grains in Nigeria. Three geographical strains of S. oryzae (Nigeria, Trinidad and Morocco) were bred separately on Ofada rice (a Nigerian local rice variety) and wheat and then exposed to dichlorvos. The data were analyzed using analysis of variance and General Linear Model, probit analysis was used to estimate LC50 and LC95 values. The strain by food combinations varied significantly in their tolerance to dichlorvos. Overall, the Nigerian strain was the least tolerant. Nonetheless, for all strains novel host food influenced their tolerance positively; wheat in the case of the Nigerian strain and Ofada rice for the exotic strains. The results were discussed in terms of varying body size among the strains and physiological effect when insects find themselves in novel environments. The risk posed to local Nigerian rice varieties is considered through the import of exotic strains of S. oryzae, especially when entering the country on wheat.
Keywords
DDVP, Ofada Rice, Exotic Strain, Insecticide Tolerance, Cereal Import, Novel Environment, Pest Management
To cite this article
Olajire Ayodele Gbaye, Emmanuel Ayobami Oyeniyi, Muyideen Folorunsho, Graham Holloway, Impact of a Local Nigerian Rice Variety and Wheat on the Tolerance of Geographical Strains of Sitophilus oryzae to Dichlorvos, American Journal of Entomology. Vol. 3, No. 2, 2019, pp. 30-35. doi: 10.11648/j.aje.20190302.11
Copyright
Copyright © 2019 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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