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Responses of tropical maize landraces to damage by Chilo partellus stem borer

Author: Munyiri, S.W.
Author: Mugo, S.
Author: Otim, M.
Author: Tadele Tefera
Author: Beyene, Y.
Author: Mwololo, J.K.
Author: Okori, P.
Year: 2013
ISSN: 1684-5315
URI: http://hdl.handle.net/10883/3415
Abstract: The potential to manage insect pests using host-plant resistance exists, but has not been exploited adequately. The objective of this study was to determine the resistance of 75 tropical maize landraces through artificial infestation with Chilo partellusSwinhoe. The trial was laid in alpha-lattice design and each seedling was infested with five neonates three weeks after planting, over two seasons in 2009 and 2010. The number of exit holes, tunnel length, ear diameter, ear length, plant height, stem diameter, stem lodging and grain yield were measured and a selection index computed. GUAT 1050 was the most resistant with an index of 0.56, while BRAZ 2179 was the most susceptible with an index of 1.66. Ear characteristics were negatively correlated with damage parameters. The principal component biplot suggested that exit holes, cumulative tunnel length, leaf damage, cob diameter, stem lodging, selection index, ear and plant height contributed 71.2% of the variation in resistance. The mean number of exit holes and tunnel length for resistant landraces and resistant hybrid checks were similar; at 5.5 and 2.48 cm, respectively. The identified resistant landraces (GUAT 1050, GUAT 280, GUAT 1093, GUAT 1082, GUAT 1014, CHIS 114, and GUAN 34) could be used to develop C. partellus stem borer-resistant maize genotypes.
Language: English
Copyright: CIMMYT manages Intellectual Assets as International Public Goods. The user is free to download, print, store and share this work. In case you want to translate or create any other derivative work and share or distribute such translation/derivative work, please contact CIMMYT-Knowledge-Center@cgiar.org indicating the work you want to use and the kind of use you intend; CIMMYT will contact you with the suitable license for that purpose.
Type: Article
Pages: 1229-1235
Journal issue: 11
Journal: African Journal of Biotechnology
Journal volume: 12
DOI: 10.5897/AJB12.1802
Keywords: Chilo partellus
Keywords: ear length
Keywords: exit holes
Keywords: stem borer resistance
Keywords: tunnel length
Publisher URI: http://www.academicjournals.org/journal/AJB/article-abstract/530B94624212


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  • Maize
    Maize breeding, phytopathology, entomology, physiology, quality, and biotech

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