The bioecology of the cowpea pod weevil, Piezotrachelus varius, and post-harvest seed losses were studied in the laboratory and in cowpea fields in the Western Highlands of Cameroon during the first and second cropping seasons of 1999 and 2000. Adult weevils appeared before flowering and fed on c...
Ntonifor, N.
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Edimengo, P.
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Tamo, M.
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[Bioecology of the cowpea pod weevil Piezotrachelus varius Wagner (Coleoptera: Curculionidae), and cowpea seed damage]
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Bioecology of the cowpea pod weevil Piezotrachelus varius Wagner (Coleoptera: Curculionidae), and cowpea seed damage
The effects of cowpea, Vigna unguiculata (L.) Walp. canopy structure and pod position in relation to infestation and damage by the legume pod borer, Maruca testulalis Geyer were investigated. Defoliated cultivars sustained significantly less infestation and damage (P < 0.05) than those undefoliat...
Oghiakhe, S.
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Jackai, L.E.N.
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Makanjuola, W.A.
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[Cowpea plant architecture in relation to infestation and damage by the legume pod borer, Maruca testulalis Geyer (Lepidoptera: Pyralidae) 1. effect of canopy structure and pod position]
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Cowpea plant architecture in relation to infestation and damage by the legume pod borer, Maruca testulalis Geyer (Lepidoptera: Pyralidae) 1. effect of canopy structure and pod position
The possibility of the involvement of pod wall toughness in the resistance of cowpea, Vigna unguiculata (L.) Walp., to the legume pod borer, Maruca testulalis was studied. The toughness of non-intact and intact pod wall increased with age, but the rate varied at different growth stages of the pod...
Oghiakhe, S.
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Jackai, L.E.N.
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Makanjuola, W.A.
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[Podwall toughness has no effect on cowpea resistance to the legume pod borer]
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Podwall toughness has no effect on cowpea resistance to the legume pod borer
The growth and development of Clavigralla tomentosicollis Stäl (Hemiptera: Coreidae) and Maruca testulalis Geyer (Lepidoptera: Pyralidae) were studied under laboratory conditions using three cultivated Vigna varieties (IT84E‐124, TVu 1890, MRx 10‐85S) and one wild variety (TVNu 72) under a range ...
Jackai, L.E.N.
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Inang, E.E.
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[Development profiles of two cowpea pests on resistant and susceptible Vigna genotypes under constant temperatures]
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Development profiles of two cowpea pests on resistant and susceptible Vigna genotypes under constant temperatures
Land clearing of a tropical rainforest implies cutting and felling of existing vegetation by manual or mechanized techniques, with or without windrowing, followed by burning in situ or in windrows. The objective of this study was to evaluate effects of land clearing at three levels of initial soi...
Ghuman, B.S.
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Lal, R.
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[Effects of soil wetness at the time of land clearing on physical properties and crop response on an Ultisol in southern Nigeria]
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Effects of soil wetness at the time of land clearing on physical properties and crop response on an Ultisol in southern Nigeria
Two parasitic fl owering plants, Striga gesnerioides (Wild.) Vatke and Alectra vogelii (Benth.), cause substantial yield reduction in cowpea in the dry savannas of sub-Saharan Africa. Alectra is more prevalent in the northern Guinea savanna and southern Sudan savanna of West Africa, as well as in...
Singh, B.B.
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[Breeding cowpea varieties with combined resistance to Striga gesnerioides and Alectra vogelii]
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Breeding cowpea varieties with combined resistance to Striga gesnerioides and Alectra vogelii
Two pot experiments were conducted, one to evaluate the levels of tolerance of fifteen cowpea [Vigna unguiculata (L.) Walp] lines to aluminum (Al) application, and the second to determine the effect of phosphorus (P) addition on the performance of Al‐tolerant lines (IT 91K‐93–10, IT 93K‐2046–1, a...
Kolawole, G.O.
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Tian, G.
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Singh, B.
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[Differential response of cowpea lines to aluminum and phosphorus application]
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Differential response of cowpea lines to aluminum and phosphorus application
Artificial feeding assays were used to study the effect of purified galactose-specific lectins from African yam beans (Sphenostylis stenocarpa) on development of larvae of the cowpea weevil, Callosobruchus maculatus (Coleoptera: Bruchidae) and the legume pod-borer, Maruca vitrata (Lepidoptera: Py...
Machuka, J.
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Okeola, O.
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Chrispeels, M.
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[The African yam bean seed lectin affects the development of the cowpea weevil but does not affect the development of larvae of the legume pod borer]
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The African yam bean seed lectin affects the development of the cowpea weevil but does not affect the development of larvae of the legume pod borer
This study was undertaken to elucidate the nature of inheritance of the two types of drought tolerance in cowpea {Vigna unguiculata (L.) Walp} so that the drought tolerant can be effectively used in breeding programme. Three cowpea lines viz TVu 11986 willi ‘Type l' drought tolerance, Dan IIa wit...
Mai-Kodomi, Y.
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Singh, B.
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Terao, T.
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Myers, O.
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Yopp, J.H.
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Gibson, P.J.
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[Inheritance of drought tolerance in cowpea]
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Inheritance of drought tolerance in cowpea