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Potted cowpea, Vigna unguiculata (L.) Walp., plants were used to determine the effects of defoliation and pod position relative to the leaf canopy on infestation and damage by the coreid pod-bugs Clavigralla tomentosicollis Stål and Anoplocnemis curvipes (F.). Temperature measurements were taken ...


Koona, P.Osisanya, E.Jackai, L.E.N.Tonye, J.[Infestation and damage by Clavigralla tomentosicollis and Anoplocnemis curvipes (Hemiptera: Coreidae) in cowpea plants with modified leaf structure and pods in different positions relative to the canopy]Infestation and damage by Clavigralla tomentosicollis and Anoplocnemis curvipes (Hemiptera: Coreidae) in cowpea plants with modified leaf structure and pods in different positions relative to the canopy

‘Monitored' sprays are applied when the action threshold (AT) has been reached or exceeded, based on monitoring of crop damage or pest infestation, whereas ‘calendar' sprays are applied at specific days after planting without taking into account continued presence or absence of the pest. In this ...


Afun, J.Jackai, L.E.N.Hodgson, C.[Calendar and monitored insecticide application for the control of cowpea pests]Calendar and monitored insecticide application for the control of cowpea pests

Field surveys were conducted on cowpea and pigeon pea in 1995 and 1996 to assess the effect of indigenous egg parasitoids on populations of Clavigralla tomentosicollis Stål in northern Nigeria. From the egg masses of C. tomentosicollis, three species of Hymenoptera belonging to three families, na...


Asante, Stephen K.Jackai, L.E.N.Tamo, M.[Efficiency of Gryon fulviventris (Hymenoptera: Scelionidae) as an egg parasitoid of Clavigralla tomentosicollis Stal. (Hemiptera: Coreidae) in northern Nigeria]Efficiency of Gryon fulviventris (Hymenoptera: Scelionidae) as an egg parasitoid of Clavigralla tomentosicollis Stal. (Hemiptera: Coreidae) in northern Nigeria

The insecticidal activity of neem, Azadirachta indica A. Juss., was tested on two major cowpea pests using different concentrations of aqueous extracts, and powders of both neem seed and kernel. The pests were larvae of Maruca testulalis Geyer (Lepidoptera: Pyralidae), the legume pod borer and Cl...


Jackai, L.E.N.Inang, E.E.Nwobi, P.[The potential for controlling postflowering pests of cowpea, Vigna unguiculata Walp., using neem, Azadirachta indica A. Juss]The potential for controlling postflowering pests of cowpea, Vigna unguiculata Walp., using neem, Azadirachta indica A. Juss

A novel method for screening cowpea varieties for resistance to the postharvest insect pest Callosobruchus maculatus (F.) (Coleoptera: Bruchidae) was compared to conventional screening techniques at the International Institute for Tropical Agriculture (IITA) laboratory in Ibadan, Nigeria. The new...


Deverau, A.D.Jackai, L.E.N.Olusegun, T.B.Asiwe, A.N.J.[Evaluation of a novel technique for screening cowpea varieties for resistance to the seed beetle Callosobruchus maculatus]Evaluation of a novel technique for screening cowpea varieties for resistance to the seed beetle Callosobruchus maculatus

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.Jackai, L.E.N.Makanjuola, W.A.[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]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.Jackai, L.E.N.Makanjuola, W.A.[Podwall toughness has no effect on cowpea resistance to the legume pod borer]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.Inang, E.E.[Development profiles of two cowpea pests on resistant and susceptible Vigna genotypes under constant temperatures]Development profiles of two cowpea pests on resistant and susceptible Vigna genotypes under constant temperatures

Studies were conducted at the International Institute of Tropical Agriculture, (IITA) to study the incidence and spread of the Spiralling whitefly (SWF) (Aleurodicus dispersus) at the IITA campus in lbadan, Nigeria, and the response of some of IITA's elite cassava germplasm to infestation by this...


Asiwe, J.Dixon, A.Jackai, L.E.N.Nukenine, E.[Investigations on the spread of the spiralling whitefly (Aleurodicus dispersus, Russell) and field evaluation of elite cassava populations for genetic resistance]Investigations on the spread of the spiralling whitefly (Aleurodicus dispersus, Russell) and field evaluation of elite cassava populations for genetic resistance

Trials were conducted in Kano, northern Nigeria, during 1996 and 1997 cropping seasons to determine the influence of date of planting and two well-timed insecticides sprays on the incidence of major insect pests namely, the legume pod-borer, Maruca vitrata Fab., legume flower thrips, Megalurothri...

Des essais ont été conduits durant les saisons culturales de 1996 et 1997 à Kano au nord du Nigeria pour déterminer l'influence de la date de plantation et la pulverization de deux insecticides bien connus sur l'incidence des principaux insectes à savoir les boreurs des gousses des légumineuses, ...


Asante, S.Tamo, M.Jackai, L.E.N.[Integrated management of cowpea insect pests using elite cultivars, date of planting and minimum insecticide application]Integrated management of cowpea insect pests using elite cultivars, date of planting and minimum insecticide application

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