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    Field evaluation of improved cowpea lines for resistance to bacterial blight, virus and striga under natural infestation in the West African savannas

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    ajeigbe-field-2008.pdf (79.20Kb)
    Date
    2008-10
    Author
    Ajeigbe, Hakeem A.
    Singh, B.B.
    Emechebe, A.M.
    Type
    Journal Article
    Metadata
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    Abstract/Description
    The average productivity of cowpea in the existing traditional systems is low due to a complex of biotic and abiotic stresses. The biotic factors include insect pests, parasitic plants, and viral, fungal and bacterial diseases. Concerted efforts are being made to develop improved cowpea varieties with combined resistance to these constraints. Twenty five cowpea lines including two local land-races were grown at three locations in the first year (2002) and at six locations in the second year (2003) in Nigeria and Niger for field screening for resistance to Bacterial blight. Many of the improved varieties had significantly higher grain and fodder yields than the local checks. There was genotype x environment interactions for grain and fodder yields. About 44% of the varieties tested were resistant to bacterial blight while 20% showed moderate resistance and others were susceptible. Bacterial blight was more important in the Sahel, and several improved cowpea breeding lines, IT98K-506-1, IT97K-1113-7, IT97K- 1069-6, IT97K-1092-2, IT97K-1069-5, IT98K-131-2 and IT97K-568-18 produced higher grain and fodder yields than the other varieties and showed combined resistance to the disease. These varieties should therefore be evaluated on-farm for onward release to farmers where there seed types meet the farmers preferred seed type other wise they can be used as parent lines as source of important genes for resistant to the diseases and high grain and fodder yields.
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/2840
    IITA Subjects
    Plant Breeding; Cowpea; Plant Production; Plant Genetic Resources; Farming Systems; Food Security; Farm Management; Plant Diseases; Genetic Improvement; Disease Control; Pests Of Plants; Crop Husbandry; Handling, Transport, Storage And Protection Of Agricultural Products
    Agrovoc Terms
    Bacterial Blight; Cowpeas; Virus; Striga; Yield; West Africa Savanna; Biotic And Abiotic Factors; Pathogen
    Regions
    Africa; Acp; West Africa; East Asia
    Countries
    Nigeria; India
    Collections
    • Journal and Journal Articles4842
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