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Historically, conventional breeding has been the primary strategy used to develop a number of Striga-resistant varieties currently grown in the Sahel of Western Africa. In this study, we have successfully developed and applied a marker-assisted selection strategy that employs a single backcross p...


Omoigui, L.O.Kamara, A.Y.Moukoumbi, Y.D.Ogunkanmi, L.A.Timko, M.P.[Breeding cowpea for resistance to striga gesnerioides in the Nigerian dry savannas using marker-assisted selection]Breeding cowpea for resistance to striga gesnerioides in the Nigerian dry savannas using marker-assisted selection

Weed seed bank size and composition were analysed in 1995 and 1996 in maize fields mulched with pruning from Gliricidia sepium, Leucaena leucocephala, and Senna siamea in South Western Nigeria. Plots mulched with pruning from the three trees had a lower weed seed bank in the first year of croppin...


Kamara, A.Y.Akobundu, I.O.Chikoye, D.Jutzi, S.C.[Weed seed bank size and composition in an arable crop mulched with pruning from three multipurpose trees in southwestern Nigeria]Weed seed bank size and composition in an arable crop mulched with pruning from three multipurpose trees in southwestern Nigeria

Field trials were conducted in 2005 and 2006 in Tilla (northern Guinea savanna) and Sabon-Gari (Sudan savanna) in northeast Nigeria to determine the performance of two improved cowpea varieties when relay-intercropped with early and late maize, 6 and 8 weeks after planting the maize. Grain yield,...


Kamara, A.Y.Omoigui, L.O.Ewansiha, S.U.Ekeleme, F.Chikoye, D.Ajeigbe, Hakeem A.[Performance of semideterminate and indeterminate cowpeas relaycropped into maize in Northeast Nigeria]Performance of semideterminate and indeterminate cowpeas relaycropped into maize in Northeast Nigeria

Striga gesnerioides is considered a major constraint to improving cowpea productivity in the semi arid region of Africa. A field survey was conducted in a farmer participatory process in 100 cowpea fields to determine farmers’ crop production practices that influence infestation by the parasitic ...


Dugje, I.Y.Kamara, A.Y.Ekeleme, F.[Evaluation of farmers crop production practices that determine Striga gesnerioides infestation of cowpea fields in Nigerian savannas]Evaluation of farmers crop production practices that determine Striga gesnerioides infestation of cowpea fields in Nigerian savannas

Cowpea is an important food crop in the dry savannas of West and Central Africa because of its high protein content. Yields are, however, considerably reduced by the parasitic angiosperm Striga gesnerioides. Field trials over 2 years in two localities in northeast Nigeria evaluated the performanc...


Kamara, A.Y.Chikoye, D.Ekeleme, F.Omoigui, L.O.Dugje, I.Y.[Field performance of improved cowpea varieties under conditions of natural infestation by the parasitic weed Striga gesnerioides]Field performance of improved cowpea varieties under conditions of natural infestation by the parasitic weed Striga gesnerioides

The success of most crop improvement programs largely depends upon the genetic variability and the heritability of desirable traits. The magnitude and type of genetic variability help the breeder to determine the selection criteria and breeding schemes to be used for improvement purposes. A scree...


Omoigui, L.O.Ishiyaku, M.F.Kamara, A.Y.Alabi, S.O.Mohammed, S.G.[Genetic variability and heritability studies of some reproductive traits in cowpea (Vigna unguiculata (L.) Walp.)]Genetic variability and heritability studies of some reproductive traits in cowpea (Vigna unguiculata (L.) Walp.)

The goal of this research was to evaluate diverse cowpea genotypes developed over the past 4 decades in the Nigerian Sudan Savannas for their agronomic performance and to identify groups of cultivars with similar quantitative characters. Characterization would facilitate the efficient synthesis o...


Kamara, A.Y.Ewansiha, S.U.Ajeigbe, Hakeem A.Omoigui, L.O.Tofa, A.I.Karim, K.Y.[Agronomic evaluation of cowpea cultivars developed for the West African Savannas]Agronomic evaluation of cowpea cultivars developed for the West African Savannas

This study sought to identify new sources of resistance to cowpea aphids (CPA) using molecular and phenotypic approaches and the inheritance pattern. Sixty cowpea genotypes were phenotyped for resistance to CPA using insect proof cages and further confirmed using markers linked to aphid resistanc...


Omoigui, L.O.Ekeuro, G.C.Kamara, A.Y.Bello, L.L.Timko, M.P.Ogunwolu, G.O.[New sources of aphids [Aphis craccivora (Koch)] resistance in cowpea germplasm using phenotypic and molecular marker approaches]New sources of aphids [Aphis craccivora (Koch)] resistance in cowpea germplasm using phenotypic and molecular marker approaches

A field study was conducted to determine the rate of genetic improvement in grain and fodder yields and associated agronomic and physiological changes of determinate and semideterminate cowpea [Vigna unguiculata (L.) Walp.] genotypes developed in the Nigerian Sudan savannas in 1974 to 2004. Resul...


Kamara, A.Y.Tefera, H.Ewansiha, S.U.Ajeigbe, Hakeem A.Okechukwu, R.U.Boukar, O.Omoigui, L.O.[Genetic gain in yield and agronomic characteristics of cowpea cultivars developed in the Sudan savannas of Nigeria over the past three decades]Genetic gain in yield and agronomic characteristics of cowpea cultivars developed in the Sudan savannas of Nigeria over the past three decades

Striga gesnerioides (Willd) Vatke, is a major destructive parasitic weed of cowpea (Vigna unguiculata (L.) Walp.) which causes substantial yield reduction in West and Central Africa. The presence of different virulent races within the parasite population contributes to significant genotype × envi...


Omoigui, L.O.Kamara, A.Y.Ajeigbe, Hakeem A.Akinwale, R.O.Timko, M.P.Oyekunle, M.Bello, L.L.[Performance of cowpea varieties under Striga gesnerioides (Willd.) Vatke infestation using biplot analysis]Performance of cowpea varieties under Striga gesnerioides (Willd.) Vatke infestation using biplot analysis

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