Control of Grapevine Leafroll Disease Spread at a Commercial Wine Estate in South Africa: A Case Study

2013 ◽  
Vol 64 (2) ◽  
pp. 296-305 ◽  
Author(s):  
G. Pietersen ◽  
N. Spreeth ◽  
T. Oosthuizen ◽  
A. van Rensburg ◽  
M. van Rensburg ◽  
...  
2010 ◽  
Vol 100 (8) ◽  
pp. 830-834 ◽  
Author(s):  
Chi-Wei Tsai ◽  
Adib Rowhani ◽  
Deborah A. Golino ◽  
Kent M. Daane ◽  
Rodrigo P. P. Almeida

To understand ecological factors mediating the spread of insect-borne plant pathogens, vector species for these pathogens need to be identified. Grapevine leafroll disease is caused by a complex of phylogenetically related closteroviruses, some of which are transmitted by insect vectors; however, the specificities of these complex virus–vector interactions are poorly understood thus far. Through biological assays and phylogenetic analyses, we studied the role of vector-pathogen specificity in the transmission of several grapevine leafroll-associated viruses (GLRaVs) by their mealybug vectors. Using plants with multiple virus infections, several virus species were screened for vector transmission by the mealybug species Planococcus ficus and Pseudococcus longispinus. We report that two GLRaVs (-4 and -9), for which no vector transmission evidence was available, are mealybug-borne. The analyses performed indicated no evidence of mealybug–GLRaV specificity; for example, different vector species transmitted GLRaV-3 and one vector species, Planococcus ficus, transmitted five GLRaVs. Based on available data, there is no compelling evidence of vector–virus specificity in the mealybug transmission of GLRaVs. However, more studies aimed at increasing the number of mealybug species tested as vectors of different GLRaVs are necessary. This is especially important given the increasing importance of grapevine leafroll disease spread by mealybugs in vineyards worldwide.


Author(s):  
Melanie SARANTOU ◽  
Satu MIETTINEN

This paper addresses the fields of social and service design in development contexts, practice-based and constructive design research. A framework for social design for services will be explored through the survey of existing literature, specifically by drawing on eight doctoral theses that were produced by the World Design research group. The work of World Design researcher-designers was guided by a strong ethos of social and service design for development in marginalised communities. The paper also draws on a case study in Namibia and South Africa titled ‘My Dream World’. This case study presents a good example of how the social design for services framework functions in practice during experimentation and research in the field. The social design for services framework transfers the World Design group’s research results into practical action, providing a tool for the facilitation of design and research processes for sustainable development in marginal contexts.


2019 ◽  
Vol 29 (1) ◽  
Author(s):  
N G Mugovhani ◽  
Lebogang Lance Nawa

This article discusses and raises awareness about the socio-economic plight of indigenous musicians in South Africa. Through a qualitative case study of the Venda musician, Vho-Talelani Andries Ntshengedzeni Mamphodo, dubbed the “Father of mbila music,” the article highlights the fact that the welfare of Black South African artists, particularly indigenous musicians in South Africa, is generally a precarious affair. Their popularity, at the height of their careers, sometimes masks shocking details of exploitation, neglect, and the poverty they are subjected to, which are exposed only after they have died. Empirical data identifies this as a symptom of, among other things, cultural policy and arts management deficiencies in the promotion of indigenous music. The article aims to find ways to redress this unfortunate situation, which is partially a product of general apathy and scant regard that these artists have perennially been subjected to, even by their own governments, as well as some members of their societies. All these factors mentioned are compounded by ignorance on the part of South African artists. Part of the objective of this study was to establish whether the exposition of the Vhavenda musicians is a typical example of all Black South African indigenous musicians and, if this is the case, whether the suggested ways to redress this unfortunate situation could contribute to or play a role in alleviating the plight of such artists in the entire country.


2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Sanction Madambi

The migration of Zimbabweans into South Africa is shaped by several factors and processes. Traditionally, the decision to migrate was mostly based on family considerations (where gender stereotypic roles were a priority), although in some cases the migrants exercised individualism and personal agency. This led to migration trends that were male dominated. Current Zimbabwean migration trends reflect large volumes of women as the socio-economic crisis forces them to leave their country. These migrant women encounter a myriad of challenges in their host countries. This paper explores Zimbabwean women’s migration to the town of Mthatha in South Africa, highlighting their challenges and the strategies they employ to overcome these, as found in a recent case study. Applying a qualitative research design and using questionnaires and interviews to gather data from the 100 purposively sampled women, the study found that many Zimbabwean migrant women in Mthatha encountered numerous challenges. They lacked the required documents to live and work in South Africa, experienced exploitation and marriage constraints, and had broken ties with their families back in Zimbabwe. According to the study, these women managed to navigate these challenges, rising above the stereotypic norms and values that used to label them as non-productive citizens to superheroes who were supporting their families and the country’s economy—thus breaking the shackles of gender stereotyping to create new norms. These findings underline the importance of shifting from the traditional approaches to women migration and pursuing perspectives that present migration as a critical component of the process of social change and development to all migrants.


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