Evaluation of four cowpea lines for bruchid (Callosobruchus maculatus)
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Date
2013
Authors
Amusa, O. D.
Ogunkanmi, L. A.
Bolarinwa, K. A.
Ojobo, O.
Journal Title
Journal ISSN
Volume Title
Publisher
International Institute for Science, Technology and Education, University of North Carolina, USA
Abstract
Cowpea, an important legume in many developing countries, is face by varieties of biotic stresses. Among them
is the infestation of stored grains by Callosobruchus maculatus, an insect pest capable of causing high grain loss
both in quantity and quality. However, resistant genotypes were developed to reduce the damages on stored seed
grains by this insect pest. The study evaluated the level of resistance in four cowpea genotypes collected from
the International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria. These cultivars were infested with
bruchids for three days in four replicates. Comparative data were then collected from the samples study for
analysis. This study showed that there was a positive perfect correlation between percentage pest tolerance and
the number of undamaged seeds. The study also showed that most of the resistant genotypes were susceptible
with TVx 3236 being the most susceptible. IT99K-494-6 and IT84S-2246-4 suggested in earlier literatures to be
resistant to bruchid attack were also susceptible. However, IT81D-994 showed a moderate tolerance to the
infestation with percentage pest tolerance of 60. It is therefore imperative that bruchid tolerance evaluation be
done periodically on released resistant genotypes to ascertain the stability and durability of their resistance
against bruchid infestation
Description
Cowpea bruchid, Callosobruchus maculatus Fab., is a major pest of cowpea in storage. Identifying resistance/tolerant varieties among cowpea genotypes will play a major role in improving cowpea production. Sample accessions of cowpea were screened for bruchid resistance and yield a moderately resistant genotype IT81D-994 that can be incorporated in bruchid resistance breeding programs in cowpea improvement.
Keywords
Research Subject Categories::FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING::Plant production , Cowpea , Callosobruchus maculatus , Pest tolerance , Pest infestation , Susceptibility
Citation
Amusa O.D., Ogunkanmi, L.A., Bolarinwa, K.A. and Ojobo, O. (2013). Evaluation of four cowpea lines for bruchid (Callosobruchus maculatus) Tolerance. Journal for Natural Sciences Research, 3(11): 46-52 (University of North Carolina, USA).