Pathogenic Variability of Angular Leaf Spot Disease of Common Bean in Western Kenya
International Journal of Applied Agricultural Sciences
Volume 2, Issue 6, November 2016, Pages: 92-98
Received: Sep. 29, 2016; Accepted: Oct. 20, 2016; Published: Nov. 8, 2016
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Authors
Robert Kiptabut Leitich, Biological Sciences Department, Masinde Muliro University of Science and Technology (MMUST), Kakamega, Kenya
D. O. Omayio, Biological Sciences Department, Masinde Muliro University of Science and Technology (MMUST), Kakamega, Kenya
B. Mukoye, Biological Sciences Department, Masinde Muliro University of Science and Technology (MMUST), Kakamega, Kenya
B. C. Mangeni, Biological Sciences Department, Masinde Muliro University of Science and Technology (MMUST), Kakamega, Kenya
D. W. Wosula, Biological Sciences Department, Masinde Muliro University of Science and Technology (MMUST), Kakamega, Kenya
W. Arinaitwe, International Centre for Tropical Agriculture (CIAT), Kawanda, Uganda
R. M. Otsyula, Kenya Agricultural and Livestock Research Organisation (KALRO), Kakamega, Kenya
H. K. Were, Biological Sciences Department, Masinde Muliro University of Science and Technology (MMUST), Kakamega, Kenya
M. M. Abang, Food and Agriculture Organisation (FAO) of the United Nations, Addis Ababa, Ethiopia
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Abstract
Common bean (Phaseolus vulgaris L.) is the most important legume and is second only to maize as a food crop in Kenya. Despite its importance, bean productivity is declining in western Kenya due to several biotic and abiotic constraints including several fungal diseases. Among these diseases, angular leaf spot (Phaeoisariopsis griseola (Sacc.) is one of the most damaging and widely distributed diseases of common bean, causing yield losses as high as 80%. Furthermore, the problem is compounded by limited information on pathogen distribution and variability in western Kenya hindering breeding for angular leaf spot (ALS) resistance. Therefore, this study was carried out to characterise the ALS pathogen (Phaeoisariopsis griseola) (Sacc.) into different pathotypes. Forty-two isolates of P. griseola were collected from different bean growing areas of western Kenya and characterized into six pathotypes (63:11, 30:26, 33:23, 63:7, 31:10 and 63:63) by use of 12 differential cultivars. Advanced lines and commercial varieties obtained from KALRO-Kakamega were separately inoculated with six pathotypes of P. griseola and evaluated for disease reaction in the screenhouse. A screening trial of Mesoamerican and Andean bean genotypes showed that two varieties were tolerant (disease scores 1 to 3), fourteen varieties were moderately resistant (scores 4 to 6) and four varieties were susceptible (7 to 9). The tolerant varieties were small-seeded, while the susceptible varieties were mostly large-seeded.
Keywords
Beans, Pathotypes, Phaeoisariopsis griseola, Severity
To cite this article
Robert Kiptabut Leitich, D. O. Omayio, B. Mukoye, B. C. Mangeni, D. W. Wosula, W. Arinaitwe, R. M. Otsyula, H. K. Were, M. M. Abang, Pathogenic Variability of Angular Leaf Spot Disease of Common Bean in Western Kenya, International Journal of Applied Agricultural Sciences. Vol. 2, No. 6, 2016, pp. 92-98. doi: 10.11648/j.ijaas.20160206.13
Copyright
Copyright © 2016 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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