Insecticide application for economic production of cowpea grains in the northern Sudan savanna of Nigeria

Amatobi, C. I.

doi:10.1080/09670879509371914

Cited by 19 publications

(18 citation statements)

References 5 publications

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“…Results from this study therefore, clearly indicate that insect pest infestations at flowering and podding stages are a significant limiting factor to increased and sustainable cowpea grain production in the Transkei. This corroborates the findings of Asiwe (2009c), Karungi et al (2000), Kyamanywa (1996) and Amatobi (1995), who have shown that pod borers and pod-sucking bugs are important insect pests of cowpea. Pod borers are important pest of the reproductive structures of cowpea with early feeding leading to flower bud and flower abortions, hence poor pod set (Tamo et al, 1997).…”

Section: Discussionsupporting

confidence: 80%

“…To enhance the efficacy of insecticides and reduce their indiscriminate use, their application should be carefully timed and managed to coincide with stages in crop phenology where pest pressure is high. Several studies in tropical Africa have suggested that spraying twice (once at flowering and podding) is sufficient to control insect pests and increase cowpea grain yield (Alghali, 1992;Amatobi, 1995;Kyamanywa, 1996;Parh, 1993;Ajeigbe and Singh, 2006). In Transkei, no insect pest control studies or spray schedules as in the tropical agro-ecosystems has been conducted, especially for the arid grassland agroecological zone of the Transkei where subsistence and rural farmers are being encouraged and empowered to cultivate indigenous food crops and vegetables that are rich in nutritive plant protein and other macro-nutrients such as cowpea.…”

Section: Introductionmentioning

confidence: 99%

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Effects of insecticide spray application on insect pest infestation and yield of cowpea (Vigna unguiculata (L.) Walp.) in the Transkei, South Africa

Dzemo¹,

Niba²,

Asiwe³

2010

Afr. J. Biotechnol.

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Field studies were conducted during the 2008 -2009 cropping season to determine the minimal insecticide application which can reduce cowpea yield losses on the field due to insect pest infestations in the Transkei region of South Africa. Treatments consisted of five cowpea varieties and four regimes of insecticide spray which were laid out with a split-plot experimental design with four replications. Observations were taken on the incidence of major insect pests, cowpea pod and seed damage by insects as well as growth and yield parameters of the cowpea varieties. Results showed that spray regimes had significant effects on insect population counts, pod and seed damage and consequently on cowpea yield parameters. Application of insecticide once each at flower budding and early podding significantly reduced pod borers and pod-sucking bugs infestations by 44 and 56%, respectively, compared to the untreated control. Application of insecticide, once at flower budding, early podding and pod filling significantly reduced pod and seed damage, resulting in substantial increase in number of pods, pod weight and seed weight per plant, and also number of seeds per pod of cowpea compared to the untreated control. This study provides information on the incidence of major insect pests of cowpea as well as the minimum insecticide control intervention necessary for effectively reducing cowpea yield losses on the field. Two insecticide spray regimes (once at flowering and podding) significantly reduced insect population and damage of cowpea.

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Section: Discussionsupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Effects of insecticide spray application on insect pest infestation and yield of cowpea (Vigna unguiculata (L.) Walp.) in the Transkei, South Africa

Dzemo¹,

Niba²,

Asiwe³

2010

Afr. J. Biotechnol.

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“…*Significant at P 5 0.05; n.s., not significant at P 5 0.05. Amatobi (1995) and Kamara et al (2007). Pest population levels were higher in 2006 than 2007 because of higher rainfall in September 2006 when cowpea was flowering.…”

Section: Discussionmentioning

confidence: 92%

Integrating planting date with insecticide spraying regimes to manage insect pests of cowpea in north-eastern Nigeria

Kamara

Ekeleme

Omoigui

et al. 2010

International Journal of Pest Management

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We sought to establish the most effective combination of planting dates with insecticide spraying regimes for the management of insect pests of cowpea in the savannas of northeast Nigeria. The results after 3 sprays, made once each at the bud initiation, flowering, and podding stages, did not differ significantly from those after 2 sprays, made once each at flowering and podding, in terms of reducing insect pest population and increasing grain yield. Despite the reduction in insect infestation, delaying planting beyond mid-August reduced cowpea grain yield by 12.3%, on average. The yield of the medium-maturing variety IT89KD-391 was significantly higher when planted in mid-August and sprayed twice than when planted on the earlier or later dates. The yield of the indeterminate late-maturing variety ITKD89-288 was higher when planted in early August and sprayed thrice. Early-and mediummaturing cowpea varieties should therefore be planted in mid-August and sprayed twice. Late-maturing indeterminate varieties should be planted in early August and sprayed thrice.

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“…Insect pests are a major constraint in cowpea production and storage (Singh & Allen, 1980;Youdeowei, 1989). Insecticide applications have proven to be economically profitable (Amatobi, 1995). However, under subsistence farming conditions, pesticide applications in cowpea remains beyond the reach of most farmers, mainly due to lack of cash and because farm chemicals are not readily available.…”

Section: Introductionmentioning

confidence: 99%

The impact of the egg parasitoid Uscana lariophaga on Callosobruchus maculatus populations and the damage to cowpea in a traditional storage system

Huis¹,

Schütte²,

Sagnia

1998

Entomologia Exp Applicata

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In West Africa, Uscana lariophaga (Hymenoptera: Trichogrammatidae) parasitizes the eggs of Callosobruchus maculatus (Coleoptera: Bruchidae), an important pest of stored cowpea. The impact of the egg parasitoid on pest populations was evaluated in clay pots used in traditional storage in Niger. At the beginning of the storage period cowpeas were infested with different densities of larval instars and adults of C. maculatus and inoculated with one density of U. lariophaga. The higher the initial densities of C. maculatus, the better the egg parasitoid was able to establish itself and to control the population of C. maculatus, limiting the damage to cowpea. After three months of storage, the egg parasitoid significantly reduced the number of C. maculatus adults by 68 at the lowest and 86 percent at the highest initial density of the beetle; the percentage of damaged beans was reduced by 13 and 19% respectively.

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Insecticide application for economic production of cowpea grains in the northern Sudan savanna of Nigeria

Cited by 19 publications

References 5 publications

Effects of insecticide spray application on insect pest infestation and yield of cowpea (Vigna unguiculata (L.) Walp.) in the Transkei, South Africa

Effects of insecticide spray application on insect pest infestation and yield of cowpea (Vigna unguiculata (L.) Walp.) in the Transkei, South Africa

Integrating planting date with insecticide spraying regimes to manage insect pests of cowpea in north-eastern Nigeria

The impact of the egg parasitoid Uscana lariophaga on Callosobruchus maculatus populations and the damage to cowpea in a traditional storage system

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