Vegetable Production in Tropical Africa: Status and Strategies for Sustainable Management

Olasantan, F. O.

doi:10.1300/j064v30n03_05

Cited by 16 publications

(11 citation statements)

References 26 publications

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“…Thus, vegetable production receives comparatively less attention. Studies by Olasantan (2007) on the status of vegetable production in Tropical Africa support this view. This may be related in part to the degree to which households are knowledgeable about the nutritional value of vegetables and to the scale of investments in irrigation infrastructure needed during prolong absence of rain and extreme temperatures (Olasantan 2007).…”

Section: Vegetable Farmingmentioning

confidence: 92%

“…Studies by Olasantan (2007) on the status of vegetable production in Tropical Africa support this view. This may be related in part to the degree to which households are knowledgeable about the nutritional value of vegetables and to the scale of investments in irrigation infrastructure needed during prolong absence of rain and extreme temperatures (Olasantan 2007). However, with vegetable production having the potential to improve livelihood (Olasantan 2007) there is a need to promote the many high-value traditional vegetables that can be exported as well as used locally.…”

Section: Vegetable Farmingmentioning

confidence: 92%

“…This may be related in part to the degree to which households are knowledgeable about the nutritional value of vegetables and to the scale of investments in irrigation infrastructure needed during prolong absence of rain and extreme temperatures (Olasantan 2007). However, with vegetable production having the potential to improve livelihood (Olasantan 2007) there is a need to promote the many high-value traditional vegetables that can be exported as well as used locally. Even the exotic vegetables such as cauliflower, carrots, lettuce and cucumber grown mostly around the cities under irrigation can be promoted among the rural farmers as they do well throughout the year.…”

Section: Vegetable Farmingmentioning

confidence: 99%

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Dependence on forest resources and tropical deforestation in Ghana

Appiah

Blay

Damnyag

et al. 2007

Environ Dev Sustain

144

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In Ghana, forests provide many products on which the local population subsists. However, these resources are depleting due to a variety of factors including agricultural expansion and over-exploitation of forest resources. This paper presents an analysis of the level of local dependence on forest resources and its implications for forest management in Ghana. The paper also outlines the causes of continuing deforestation in the studied region from the perspective of the local residents and discusses what role they could play in addressing the problem. The aim is to share more light on the current causes of deforestation and make suggestions for improved community-based forest management practices that could help to reduce deforestation. Primary data was collected through personal interviews and focus group discussions with 431 household heads randomly selected from three Forest Districts in Ghana. The survey showed that income from agriculture constituted 60% of the average total rural household income. Forest income provided 38% of total household income, and off-farm income 2%. The four most highly ranked causes of deforestation are poverty-driven agriculture, lack of alternative rural wage employment other than farming, household population levels, and conflict in traditional land practices. This shows a shift in the view of local people who in the past were quick to blame logging companies and government policies for deforestation. The majority of the respondents depended on wild animals like snail, bush meat, wild honey and wild and cultivated vegetables. Given the reasons for deforestation, much thought needs to go into Readers should send their comments on this paper to: BhaskarNath@aol.com within 3 months of publication of this issue.

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Section: Vegetable Farmingmentioning

confidence: 92%

Section: Vegetable Farmingmentioning

confidence: 92%

Section: Vegetable Farmingmentioning

confidence: 99%

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Dependence on forest resources and tropical deforestation in Ghana

Appiah

Blay

Damnyag

et al. 2007

Environ Dev Sustain

144

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“…In Nigeria, early planting of pepper or tomato has been found to reduce disease incidence [79]. Practices suggested for vegetable production in tropical Africa have also been intercropping to divert whiteflies or changed sowing times to avoid periods of peaks with pest populations [93]. The best-suited practices for control of begomovirus infections will depend on the local conditions, and different types of management methods will have to be tested.…”

Section: Agricultural Practicesmentioning

confidence: 99%

Begomovirus disease complex: emerging threat to vegetable production systems of West and Central Africa

et al. 2015

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Vegetables play a major role in the livelihoods of the rural poor in Africa. Among major constraints to vegetable production worldwide are diseases caused by a group of viruses belonging to the genus Begomovirus, family Geminiviridae. Begomoviruses are plant-infecting viruses, which are transmitted by the whitefly vector Bemisia tabaci and have been known to cause extreme yield reduction in a number of economically important vegetables around the world. Several begomoviruses have been detected infecting vegetable crops in West and Central Africa (WCA). Small single stranded circular molecules, alphasatellites and betasatellites, which are about half the size of their helper begomovirus genome, have also been detected in plants infected by begomoviruses. In WCA, B. tabaci has been associated with suspected begomovirus infections in many vegetable crops and weed species. Sequencing of viral genomes from crops such as okra resulted in the identification of two previously known begomovirus species (Cotton leaf curl Gezira virus and Okra yellow crinkle virus) as well as a new recombinant begomovirus species (Okra leaf curl Cameroon virus), a betasatellite (Cotton leaf curl Gezira betasatellite) and new alphasatellites. Tomato and pepper plants with leaf curling were shown to contain isolates of new begomoviruses, collectively referred to as West African tomato-infecting begomoviruses (WATIBs), new alphasatellites and betasatellites. To study the potential of weeds serving as begomovirus reservoirs, begomoviruses and satellites in the weed Ageratum conyzoides were characterized. Sequence analyses showed that they were infected by isolates of a new begomovirus (Ageratum leaf curl Cameroon virus) that belong to the WATIBs group, a new betasatellite (Ageratum leaf curl Cameroon betasatellite), an alphasatellite and two types of defective recombinants between a begomovirus and an alphasatellite. Putative recombinations were detected in begomovirus genomes for all four plant species studied, indicating that recombination is an important mechanism for their evolution. A close relationship between the begomoviruses infecting pepper and tomato and A. conyzoides and the detection of the same alphasatellite in them support the idea that weeds are important reservoirs for begomoviruses and their satellites. With this high diversity, recombination potential and transmission by B. tabaci, begomoviruses and ssDNA satellites pose a serious threat to crop production in West and Central Africa.

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“…Host-free periods could be a successful way to control begomovirus infection [53,147] but practically difficult since the knowledge about alternative hosts of begomoviruses is very limited. Other agricultural practices for control of begomoviral diseases include eradication of source plants, use of reflective mulches and physical barriers, intercropping or delayed sowing time to divert whiteflies and use of virusfree transplants [53,102,112]. The best-suited practices for control of begomovirus infections depend on the local conditions.…”

Section: Management Strategiesmentioning

confidence: 99%

Emerging threats of begomoviruses to the cultivation of medicinal and aromatic crops and their management strategies

Saeed

Samad

2017

VirusDis.

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Begomoviruses (family Geminiviridae) are responsible for extreme yield reduction in a number of economically important crops including medicinal and aromatic plants (MAPs). Emergence of new variants of viruses due to recombination and mutations in the genomes, modern cropping systems, introduction of susceptible plant varieties, global trade in agricultural products, and changes in climatic conditions are responsible for aggravating the begomovirus problems during the last two decades. This review summaries the current research work on begomoviruses affecting MAPs and provides various traditional and advanced strategies for the management of begomoviruses and vector in MAPs.

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Vegetable Production in Tropical Africa: Status and Strategies for Sustainable Management

Cited by 16 publications

References 26 publications

Dependence on forest resources and tropical deforestation in Ghana

Dependence on forest resources and tropical deforestation in Ghana

Begomovirus disease complex: emerging threat to vegetable production systems of West and Central Africa

Emerging threats of begomoviruses to the cultivation of medicinal and aromatic crops and their management strategies

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