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The Theses collection

The theses collection contains theses and dissertations published at South African universities, contained in the CREST South African Theses Database, covering the complete value chain of table grapes.

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About the Theses collection

The theses collection contains theses and dissertations published at South African universities, contained in the CREST South African Theses Database, covering the complete value chain of table grapes.

Theses (109)

Economic aspects of losses and waste : case study of the South African table grape supply chain
By: Louw, L
Year Awarded: 2017   Source: University of Pretoria   View thesis
Globally, 1.3 billion tons of edible food is wasted per annum. Having regard for the economic, social and environmental consequences, the management of food losses and waste is an obvious priority in pursuing a sustainable, sovereign global food system. A study was undertaken to explore the phenomenon of food losses …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Food safety risks associated with the use of contaminated agricultural water in the production of table grapes
By: Mahafha, MM
Year Awarded: 2012   Source: University of Pretoria   View thesis
Most agricultural water sources are often considered contaminated, due to poorly maintained sanitation systems, polluted river streams and other water catchment areas. Agricultural water used for irrigation and reconstitution of pesticides is suspected to play a direct or indirect role in the transmission of human pathogens to fresh produce. The …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
The role of organophosphate exposure in the aetiology of depression and suicidality amoungst farm workers on wine and table grape farms in the Worcester area of the Western Cape Province, South Africa
By: Major, VJ
Year Awarded: 2010   Source: University of Cape Town   View thesis
Despite the obligatory requirements of the Occupational Health and Safety Act (Act 85 of 1993, Section 8(1)) that âevery employer shall provide and maintain a working environment that is safe and without risk to the health of its employeesâ, farm workers in South Africa are exposed to numerous occupational health …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Development of a pest management system for table grapes in the Hex River Valley
By: De Villiers, M
Year Awarded: 2006   Source: Stellenbosch University   View thesis
A study was performed to develop a generic pest monitoring system for sampling the main table grape pests in vineyards in the Hex River Valley, Western Cape Province of South Africa. The presence of phytophagous and predatory mites on cover crop plants was also investigated as this may contribute to …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Effect of varying levels of nitrogen, potassium and calcium nutrition on table grape vine physiology and berry quality
By: Raath, PJ
Year Awarded: 2012   Source: Stellenbosch University   View thesis
A lack of defects is required for successful table grape marketing, which pre-suppose optimal vine performance, berry development and post-harvest quality. The supply of mineral nutrients affects vine development, physiology and berry quality. Despite a vast amount of research conducted over decades, there remain many unresolved issues regarding table grape …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Resistance to airflow and moisture loss of table grapes inside multi-scale packaging
By: Ngcobo, MEK
Year Awarded: 2013   Source: Stellenbosch University   View thesis
Postharvest quality of fresh table grapes is usually preserved through cooling using cold air. However, cooling efficiencies are affected by the multi-scale packaging that is commercially used for handling grapes after harvest. There is usually spatial temperature variability of grapes that often results in undesirable quality variations during postharvest handling …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Thin monolithic slow-release devices for optimum in-package preservation of export table grape varieties
By: Opperman, WJ
Year Awarded: 2002   Source: Stellenbosch University   View thesis
Prototypes of a new polymer S02 gas-generating sheet for the control of Botrytis cinerea during the post-harvest storage of table grapes, were developed and manufactured for evaluation using a pilot scale production plant. Attention was paid to the appearance of the sheet, in order to make it technologically efficient as …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Water footprint analysis to improve water use efficiency in table grape (Vitis vinifera L. cv. Crimson seedless) production. A South African case study
By: Kangueehi, GN
Year Awarded: 2018   Source: Stellenbosch University   View thesis
Water scarcity is a major impediment to agricultural production, warranting economically viable water use strategies globally. The aim of this study was to evaluate the effects of differing cultivation conditions as well as environmental effects on table grapes (Vitis vinifera L. cv. Crimson Seedless) in terms of plant growth, plant …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Integrated management of false codling moth, Thaumatotibia leucotreta, on stone fruit and table grapes
By: Steyn, VM
Year Awarded: 2019   Source: Stellenbosch University   View thesis
Integrated pest management (IPM) strives to control insect pests with a multifaceted approach that mirrors that of the ecology and endeavours to restore balance to the agricultural environment. To ensure the success of an IPM programme it is vital to understand the biology and the life cycle of the target …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
The development of a management strategy for the control of the Cape grapevine leafminer, Holocacista capensis (Lepidoptera: Heliozelidae), in South African table grape vineyards
By: Steyn, LAI
Year Awarded: 2019   Source: Stellenbosch University   View thesis
The Cape grapevine leafminer, Holocacista capensis Van Nieukerken & Geertsema (Lepidoptera: Heliozelidae) has become a common pest on table grapes and wine grapes in the Western Cape province of South Africa, since it was first reported in 2012. The presence of cocoon casings on grape bunches intended for export makes …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Development of infrared spectroscopic methods to assess table grape quality
By: Daniels, AJ
Year Awarded: 2013   Source: Stellenbosch University   View thesis
The two white seedless table grape cultivars, Regal Seedless and Thompson Seedless fulfil a very important role in securing foreign income not only for the South African table grape industry, but the South African economy as a whole. These two cultivars, however, are like so many other white table grape …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Identifying temperature breaks in pome fruit and table grape export cold chains from South Africa to the United Kingdom and the Netherlands : a Western Cape case
By: Fedeli, S
Year Awarded: 2019   Source: Stellenbosch University   View thesis
There is a growing concern in the South African fruit industry of increasing losses, both financially and of the produce itself, as a result of temperature breaks in the export cold chain. This concern was so significant that an investigative enquiry was prompted by Company X, a prominent fruit exporter, …
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THESIS
'n Stochastiese besluitnemingsmodel vir tafeldruifproduksie toegepas in die Weskaap
By: Jansen van Vuuren, BG
Year Awarded: 2013   Source: Stellenbosch University   View thesis
Decision making in a complex environment is not an easy step as there are uncertainty variables that cannot be foreseen. This causes decision makers to use tools that can help and support difficult decision making in such a complex environment. These tools can be different variations of which a model …
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THESIS
Investigating quality issues after the introduction of humidifiers into table grape pack houses : a Northern Cape case
By: Kisten, C
Year Awarded: 2020   Source: Stellenbosch University   View thesis
Introduction & Background to study: South Africa is the third largest producer of table grapes in the southern hemisphere following Chile and Peru respectively. Deciduous fruits and vegetables are South Africa’s second most exported horticultural products. Table grapes form part of this export category. Post-harvest physiological disorders such as brown …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Entomopathogenic nematodes for the control of the vine mealybug (Planococcus ficus) in South African wine and table grapes
By: Le Vieux, PD
Year Awarded: 2013   Source: Stellenbosch University   View thesis
Planococcus ficus (Signoret) (Hemiptera: Pseudococcidae), the vine mealybug, is of economic importance to the wine and table grape (viticulture) industries, as it characteristically causes more damage than other mealybug species. Mealybug infestations contaminate grapes with their waxy secretions, egg-sacs and honeydew production, on which sooty mould grows, resulting in the …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Trends and determinants of competitiveness in the South African table grape industry
By: Mtshiselwa, ZL
Year Awarded: 2020   Source: Stellenbosch University   View thesis
Global competitiveness has become relevant topic, especially for South Africa’s export-driven agricultural industries like the table grape industry, which exports more than 90% of its product. In order for these industries to survive and maintain their economic relevancy in the international markets, they need to promote competitive, market-directed products and …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Supply chain finance : improving the efficiency of the table grape industry : a case study
By: Mussmann, C
Year Awarded: 2015   Source: Stellenbosch University   View thesis
“Within the context of the current market conditions, SCF may be one of the most attractive tools for companies to diversify funding basis, enrich and solidify their relationships with suppliers and their core banks.” – Michiel Steeman (Executive Director – Supply Chain Finance Community). (ING Group, 2013b). Insufficient cash flow …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Packaging of table grapes for exports from SA : a comparative study
By: Nieuwoudt, T
Year Awarded: 2015   Source: Stellenbosch University   View thesis
Table grapes are the second-largest contributor to the perishable product export in South Africa. The table grape industry also experienced considerable growth in the past ten years. The industry contributes toward employment in South Africa. The South African table grape industry experiences quality-related problems with exporting table grapes to the …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Scenario development to support strategic planning in the South African table grape industry
By: Ntombela, SM
Year Awarded: 2010   Source: Stellenbosch University   View thesis
The South African table grape industry has evolved significantly in the last two decades. Ever improving supply chain technologies, post-harvest technology innovation, and more efficient production inputs have all stimulated the production of table grapes in all five South African production regions. While the industry in general is well developed, …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Check weighing in table grape punnet packing: Opportunities in the development of operational effectiveness
By: Smit, R
Year Awarded: 2013   Source: Stellenbosch University   View thesis
South Africa is ranked as one of the largest table grape exporting countries in the world. The biggest markets for table grape exports have always been the EU and the UK, with emerging markets in Eastern Europe and Asia. The growing demand for pre-packaged fruit and vegetables in these markets …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Development and change that occurs in table grape berry composition during growth
By: Sonnekus, N
Year Awarded: 2015   Source: Stellenbosch University   View thesis
Grape quality is important for the producer, exporter and the consumer. Consumers judge table grapes according to their size, colour, taste and shelf life. The consumer’s prerequisites will influence the producer. Therefore, it is essential to know how the table grape berry develops so that it can be manipulated, favouring …
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THESIS
The influence of gibberellic acid (GA₃) for berry thinning and berry sizing on table grape production, quality and fertility of Prime
By: Van der Vyver, L
Year Awarded: 2016   Source: Stellenbosch University   View thesis
Table grapes are one of the major commercially grown non-climacteric fresh fruit crops worldwide. Over centuries the table grape industry became a niche market with increasing competition on the markets, putting pressure on table grape growers to produce quality grapes that meet market requirements nationally and internationally. To meet market …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Evaluation of the role of PGIPs in plant defense responses
By: Becker, JvW
Year Awarded: 2007   Source: Stellenbosch University   View thesis
Plants have developed sophisticated means of combating plant diseases. The events that prepare the plant for, and follow plant-pathogenic interactions, are extremely complex and have been the topic of intensive investigation in recent years. These interactions involve a plethora of genes and proteins, and intricate regulation thereof; from the host …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Characterisation and management of trunk disease-causing pathogens on table grapevines
By: Bester, WJ
Year Awarded: 2006   Source: Stellenbosch University   View thesis
Phaeomoniella chlamydospora, Eutypa lata, Phomopsis, Phaeoacremonium, and Botryosphaeria spp. are important trunk disease pathogens that cause premature decline and dieback of grapevine. Previous research has focused primarily on wine grapes and the incidence and symptomatology of these pathogens on table grapes were largely unknown. A survey was therefore conducted to …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Over-expression and analysis of two Vitis vinifera carotenoid biosynthetic genes in transgenic Arabidopsis
By: Brackenridge, AE
Year Awarded: 2006   Source: Stellenbosch University   View thesis
Plants have evolved photosynthetic systems to efficiently harvest sunlight energy for the production of carbohydrates, but these systems also are extremely susceptible to an excess of light. To combat the potential damaging effects of light, plants have developed various mechanisms to control and cope with light stress. These mechanisms include …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Quantification of spray coverage on grape bunch parts and the incidence of Botrytis cinerea
By: Brink, JC
Year Awarded: 2005   Source: Stellenbosch University   View thesis
Various studies revealed that Botrytis cinerea, the causal pathogen of Botrytis bunch rot, is mostly associated with pedicels, rachises, laterals and berry bases, and not with berry skins as previously understood. Provided that sufficient coverage of inner bunch parts was achieved, laboratory studies have shown that fungicides can effectively reduce …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Comparative analysis of four early white, seedless table grape cultivars in the Orange river area
By: Burger, H
Year Awarded: 2002   Source: Stellenbosch University   View thesis
The table grape industry is a major contributor to the South African economy, directly through foreign earnings from this predominantly export-based industry, as well as indirectly through the employment of thousands of people. It is a growing industry and consists of several production areas. The fastest growing table grape production …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Aspects of sucrose metabolism in transgenic tobacco
By: Champanis, R
Year Awarded: 2004   Source: Stellenbosch University   View thesis
In most plants the efficiency of sucrose production and the systemic distribution thereof are the major determinants of growth, development and yield. The factors governing sugar partitioning co-ordinate its distribution in response to intrinsic and environmental signals. These factors include sugar transporters and invertases as well as metabolites, including sucrose …
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THESIS
Pome fruit trees as alternative hosts of grapevine trunk disease pathogens 
By: Cloete, M
Year Awarded: 2010   Source: Stellenbosch University   View thesis
A survey was undertaken on apple and pear trees in the Western Cape Province to determine the aetiology of trunk diseases with reference to trunk diseases occurring on grapevine. Grapevine trunk diseases cause the gradual decline and dieback of vines resulting in a decrease in the vine’s capability to carry …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Isolation and characterization of antifungal peptides from plants 
By: De Beer, A
Year Awarded: 2008   Source: Stellenbosch University   View thesis
Over the last decade research has shown the importance of small antimicrobial peptides in the innate immunity of plants. These peptides do not only play a critical role in the multilayered defense systems of plants, but have proven valuable in the engineering of disease resistant food crops towards the ultimate …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Infection pathways of Botrytis cinerea on selected wine grape cultivars
By: Du Preez, IF
Year Awarded: 2002   Source: Stellenbosch University   View thesis
An understanding of the infection pathways of Botrytis cinerea in grape bunches will help to combat this devastating pathogen of grape. Many studies have been done to determine the possible infection pathways of B. cinerea. Most of these studies made use of artificial inoculations that deposit groups of conidia on …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
The role of the mediterranean fruit fly, Ceratitis capitata, in Botrytis bunch rot of grape 
By: Engelbrecht, R
Year Awarded: 2002   Source: Stellenbosch University   View thesis
Botrytis bunch rot of grape is caused by Botrytis cinerea Pers. :Fr. Conidia of the pathogen, which is dispersed by wind, water droplets and by insects, can penetrate the intact grape berry cuticle, but disease expression occurs only under predisposing conditions. Since relatively high infection rates often occur in vineyards, …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Resistance to Botrytis cinerea in parts of leaves and bunches of grapevine
By: Gütschow, M
Year Awarded: 2001   Source: Stellenbosch University   View thesis
Knowledge of the presence of Botrytis cinerea in morphological parts of bunches and leaves of grapevine would help to find a reliable, sensitive, and specific assay to verify the actual occurrence of latent infection, and to plan strategies for the effective control of B. cinerea bunch rot. The aim of …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Regulation of the Vitis vinifera PGIP1 gene encoding a polygalacturonase-inhibiting protein
By: Joubert, DA
Year Awarded: 2004   Source: Stellenbosch University   View thesis
Plant-pathogen interactions have been intensively investigated in the last decade. This major drive towards understanding the fundamental aspects involved in plant disease resistance is propelled by the obvious agricultural and economical benefits that are intrinsically linked to disease and stress resistant plants. It is, therefore, not surprising that fundamental research …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Population genetic structure and abundance of two Ceratitis species (Tephritidae) of agricultural importance in South Africa 
By: Karsten, M
Year Awarded: 2014   Source: Stellenbosch University   View thesis
Research in the field of biological invasions has increased dramatically in the last two decades, especially due to the impact of human activity such as, transport, travel and international trade. Different stages of invasion have been proposed, each stage posing different barriers that must be overcome by the organism for …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Biological control of the grapevine trunk disease pathogens : pruning wound protection
By: Kotze, C
Year Awarded: 2008   Source: Stellenbosch University   View thesis
In recent years, several studies have conclusively shown that numerous pathogens, including several species in the Botryosphaeriaceae, Phomopsis, Phaeoacremonium, as well as Phaeomoniella chlamydospora and Eutypa lata, contribute to premature decline and dieback of grapevines. These pathogens have the ability to infect grapevines through pruning wounds, which leads to a …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
The development of an enzyme linked immunosorbent assay for the detection of the South African strain(s) of grapevine fanleaf nepovirus
By: Liebenberg, AJ
Year Awarded: 2008   Source: Stellenbosch University   View thesis
South Africa is one of the top ten wine producing countries in the world. The South African wine industry contributes approximately R16.3 billion to South Africa’s annual gross domestic product with 42.8% of wine being exported. To compete with the top wine producing countries and to ensure a viable export …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
The role of sucker wounds as portals for grapevine trunk pathogen infections
By: Makatini, GJ
Year Awarded: 2014   Source: Stellenbosch University   View thesis
Grapevine trunk diseases are responsible for reduced wine and table grape production world-wide. Trunk disease infections are caused by xylem-inhabiting pathogens which include species of Botryosphaeriaceae, Diatrypaceae, Hymenochaetales and Diaporthales, as well as Phaeomoniella chlamydospora and Phaeoacremonium spp. Winter pruning wounds are regarded as the main infection-sites for trunk disease …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Functional analysis of a lignin biosynthetic gene in transgenic tobacco 
By: Mbewana, S
Year Awarded: 2010   Source: Stellenbosch University   View thesis
Necrotrophic fungi infect many economically important crop plants. This results in great losses in the agricultural sector world-wide. Understanding the nature by which plants respond to pathogens is imperative for genetically enhancing disease resistance in plants. Research tools have significantly contributed to our understanding of how the plant responds to …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
The relationship between ants (Hymenoptera: formicidae), vine mealybug (Hemiptera: pseudococcidae) and parasitoids in vineyards of the Western Cape Province, South Africa
By: Mgocheki, N
Year Awarded: 2008   Source: Stellenbosch University   View thesis
The mutual association between honeydew foraging ants and vine mealybugs in vineyards is detrimental to the biological control of the vine mealybug Planococcus ficus (Signoret). This study investigated the relationship between ants, vine mealybugs and their parasitoids to improve biological control of the vine mealybug. The investigation was carried out …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Improving pruning wound protection against grapevine trunk disease pathogens
By: Mutawila, C
Year Awarded: 2014   Source: Stellenbosch University   View thesis
Grapevine trunk diseases are a cause of decline and loss of productivity in grapevines at all stages of growth. These diseases are caused by a complex of wood-inhabiting fungi that infect mainly through pruning wounds. The management of these diseases relies on wound protection to prevent infection since there are …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Ring nematode (Criconemoides xenoplax), distribution, characterisation and culture methods 
By: Odendaal, M
Year Awarded: 2018   Source: Stellenbosch University   View thesis
The ring nematode, Criconemoides xenoplax (Raski, 1952) Loof & De Grisse, is described as a migratory ectoparasitic nematode that feeds entirely on the roots of plants, mainly those of woody perennials. The ring nematode is regarded, worldwide, as a significant pest in stone fruit orchards and vineyards, and it has …
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THESIS
Investigating the above-ground application of EPNs for the control of the vine mealybug Planococcus ficus
By: Platt, T
Year Awarded: 2017   Source: Stellenbosch University   View thesis
The table and wine grape industries in South Africa are of major economic importance, particularly within the Western Cape Province, making the pest control of grapevines a priority. The vine mealybug Planococcus ficus (Signoret) (Hemiptera: Pseudococcidae) is a key pest of South African grapevines, damaging vines by phloem feeding, by …
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THESIS
Source and identity of insect contaminants in export consignments of table grapes
By: Pryke, JS
Year Awarded: 2005   Source: Stellenbosch University   View thesis
The South African table grape industry exports approximately 60% of the table grapes produced. A major threat to the export of these grapes is the phytosanitary risk that insect pests pose. This study was conducted in the Hex River Valley, South Africa’s main table grape producing area. The aim of …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Characterisation and detection of Pythium and Phytophthora species associated with grapevines in South Africa
By: Spies, CFJ
Year Awarded: 2010   Source: Stellenbosch University   View thesis
Replant and decline diseases of grapevines cause losses due to a reduction in quantity and quality of yields, as well as costs incurred with replanting of vineyards. These diseases are caused by complex interactions between biotic and abiotic factors. Biotic factors include Pythium and Phytophthora species, since these oomycetes have …
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THESIS
Canopy manipulation practices for optimum colour of redglobe (V.Vinifera L.)
By: Strydom, J
Year Awarded: 2006   Source: Stellenbosch University   View thesis
Under certain South African conditions, Redglobe develops a colour that is too dark and thus unacceptable for the Far Eastern markets. These markets require a pink colour instead of a dark red colour. The cultivation of grapes with an acceptable colour involves amongst other, canopy management practices. This generally includes …
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THESIS
Isolation and characterisation of carotenoid biosynthetic genes from Vitis vinifera
By: Taylor, KL
Year Awarded: 2007   Source: Stellenbosch University   View thesis
Plants are constantly exposed to adverse environmental conditions including variations in light intensity and the availability of water resources. These abiotic factors are expected to worsen as the changing global climate places additional daily and seasonal demands on plant growth and productivity. As plants are incapable of avoiding stress they …
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THESIS
Evaluation of transgenic grapevine lines overexpressing Vv-AMP1 antifungal peptide
By: Tredoux, MM
Year Awarded: 2011   Source: Stellenbosch University   View thesis
The importance of small antimicrobial peptides in the innate immune system of plants became increasingly apparent over the past decade. Antimicrobial peptides are unique and diverse molecules that are found in many tissue types in a variety of invertebrate, plant and animal species. Many of these peptides, such as plant …
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THESIS
Characterisation of pathogens associated with trunk diseases of grapevines 
By: Van Niekerk, JM
Year Awarded: 2004   Source: Stellenbosch University   View thesis
In an attempt to combat some of the pathogens that are associated with trunk diseases and disorders of grapevines, research in this thesis focused on the taxonomy and pathological aspects of Coniellai/Pilidiella, Botryosphaeria and Phomopsis spp. Previously, conidial pigmentation was used to separate Pilidiella from Coniella. Recently, however, the two …
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THESIS
Infection by dry, airborne Botrytis cinerea conidia and fungicide efficacy on different parts of grape bunches and vinelets
By: Van Rooi, C
Year Awarded: 2002   Source: Stellenbosch University   View thesis
The evaluation of fungicide efficacy in commercial vineyards can be influenced by the sporadic occurrence of Botrytis cinerea at various positions on vines, differences in bunch structure during bunch development and the phenomenon that symptom expression in shoots and bunches is governed by the resistance reaction of the various shoot …
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THESIS
Open hydroponic systems in table grape production: a case study
By: Van Zyl, S
Year Awarded: 2003   Source: Stellenbosch University   View thesis
An open air hydroponic production system (OHS) is based on classic hydroponic principles, with the difference that it lacks climatological control because the plants are not produced in greenhouses and are cultivated in the outside environment. In these systems the plant is provided with all the essential nutrients through the …
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THESIS
The use of adjuvants to improve fungicide spray deposition on grapevine foliage 
By: Van Zyl, SA
Year Awarded: 2009   Source: Stellenbosch University   View thesis
Sufficient fungicide deposition on the target site is an essential requirement for effective chemical management of fruit- and foliar diseases such as grey mould of grapevines. Control failure is often attributed to insufficient quantitative deposition on susceptible grapevine tissue. However, in high disease pressure situations control failure might also be …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Development of an integrated pest management system for vine mealybug, Planococcus ficus (Signoret), in vineyards in the Western Cape Province, South Africa
By: Walton, VM
Year Awarded: 2003   Source: Stellenbosch University   View thesis
A survey was conducted in the Western Cape Province during the 1999/2000 and 2000/2001 seasons on mealybugs occurring in vineyards. P/anococcus ficus (Signoret) was the dominant mealybug in vineyards during this time. During this study P. ficus was recorded for the first time on roots of grapevines, which has far …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
The endopolygalacturonases from Botrytis cinerea and their interaction with an inhibitor from grapevine 
By: Wentzel, L
Year Awarded: 2004   Source: Stellenbosch University   View thesis
In the field of agriculture, plant pathogens are a major concern because of the severe damage these organisms cause to crops yearly. Fundamental studies regarding plant pathogens and their modes of action made it possible for researchers in the field of molecular biology to investigate pathogens further on a molecular …
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THESIS
Molecular analyses of candidate carotenoid biosynthetic genes in Vitis vinifera L.
By: Young, PR
Year Awarded: 2004   Source: Stellenbosch University   View thesis
Plants cannot avoid stress and must therefore be capable of rapidly responding to extreme environmental changes. An inability to control and regulate the photosynthetic process during stress conditions will lead to the formation of highly reactive oxygen species that concomitantly causes photo-oxidative damage to the pigments and proteins of the …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
The behaviour of Botrytis Cinerea on grape berries under different epidemiological conditions
By: Coertze, S
Year Awarded: 1998   Source: Stellenbosch University   View thesis
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
The ecology of Botrytis cinerea on grape in the Western Cape Province
By: Van Schoor, JA
Year Awarded: 2004   Source: Stellenbosch University   View thesis
Botrytis cinerea Pers.: Fr., a pathogen of grapevine (Vitis vinifera L.), moves mainly through conidia by air currents in vineyards which are deposited intermittently on the surfaces of leaves, inflorescences and bunches. Little is known about the relationship between the inoculum dosage in air and incidence of Botrytis bunch rot, …
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THESIS
Reporter gene transformation of grapevine pathogens Phaeomoniella chlamydospora and Phomopsis viticola, and biocontrol agent Trichoderma harzianum 
By: Mclean, T
Year Awarded: 2007   Source: Stellenbosch University   View thesis
Trunk diseases cause major economical losses in the grape growing industry due to decline and premature dieback, resulting in major reductions in quantity and quality in yield. Trunk diseases are caused by a complex of pathogens including basidiomycetes, species of Botryosphaeriaceae (including Botryosphaeria and aggregate genera, Lasiodiplodia and Neofusicoccum), Eutypa …
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THESIS
Developing an integrated management system for western flower thrips, Frankliniella occidentalis (Pergande), on deciduous fruit, using semiochemicals in a push-pull strategy
By: Allsopp, E
Year Awarded: 2016   Source: Stellenbosch University   View thesis
Western flower thrips (WFT), Frankliniella occidentalis (Pergande), causes both feeding (russetting and silvering) and oviposition (pansy spot) damage to fruit. Despite routine insecticide applications from 20% bloom until petal fall, pansy spot and pitting damage was still being reported, particularly on plums. This study was initiated to determine the reason …
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THESIS
Spatio-temporal mathematical models of insect trapping: analysis, parameter estimation and applications to control
By: Dufourd, CC
Year Awarded: 2016   Source: University of Pretoria   View thesis
Pest insects represent a major threat to public health, to food security as well as to the economy. Constant effort is being made to develop or improve control strategies in the framework of Integrated Pest Management (IPM). IPM aims to maintain pests at low levels that do not represent risks …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Investigation of Trichoderma species colonization of nursery grapevines from improved management of black foot 
By: Van Jaarsveld, W
Year Awarded: 2019   Source: Stellenbosch University   View thesis
Black foot disease (BFD) is one of the main fungal diseases associated with young grapevine decline. In recent years its incidence and severity has increased significantly, affecting both nurseries and young vineyards. The pathogens purported to contribute to this disease includes species from the genera Campylocarpon, Cylindrocladiella, Dactylonectria, Ilyonectria and …
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THESIS
Biological control of the banded fruit weevil, Phlyctinus callosus (Schönherr), using entomopathogenic nematodes and fungi 
By: Dlamini, B
Year Awarded: 2018   Source: Stellenbosch University   View thesis
The overall aim of this study was to establish guidelines, from research undertaken mainly in the laboratory, and from field application, for the use of entomopathogenic nematodes (EPNs) and entomopathogenic fungi (EPF) to control the banded fruit weevil (BFW), Phlyctinus callosus (Schönherr), in vineyards and apple orchards in the Western …
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THESIS
Trimen’s false tiger moth, Agoma trimenii (Lepidoptera: Agaristidae) : biology and potential control options 
By: Morris, CA
Year Awarded: 2019   Source: Stellenbosch University   View thesis
Trimen’s false tiger moth, Agoma trimenii (Lepidoptera: Agaristidae), has developed pest status in vineyards in the Northern Cape and Limpopo (Groblersdal area) provinces of South Africa. Larvae feed on new vine growth and, if not detected early, the subsequent defoliation of vineyards can be severe, resulting in crop losses. Outbreaks …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Assessment of hot water treatment for control of grapevine trunk diseases in nurseries
By: Webber, M
Year Awarded: 2020   Source: Stellenbosch University   View thesis
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
A biochemical study of budbreak and plant growth regulators in table grapes
By: Lombard, PJ
Year Awarded: 2002   Source: Stellenbosch University   View thesis
The cultivation of table grapes in the warmer areas of South Africa, indeed worldwide, is complicated by rest breaking problems in spring due to delayed budbreak. In order to overcome these problems rest breaking agents, mainly hydrogen cyanamide, are applied. However, instead of alleviating the problem, additional problems such as …
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THESIS
A systematic approach to select new table grape varieties for cultivation
By: Helberg, CJ
Year Awarded: 2021   Source: Stellenbosch University   View thesis
Producers consider these factors when selecting a new variety along with the harvest window and the profitability of the variety. The variation in input cost to improve bunch configuration and fruit quality is directly influenced by the canopy management strategy. While the price received per carton is influenced by fruit …
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THESIS
An ARTI Holonic architecture implementation for table grape production management.
By: Rossouw, JJ
Year Awarded: 2021   Source: Stellenbosch University   View thesis
The management of table grape production is complex, since it must adhere to strict production requirements, facilitate numerous decisions by various experts, and integrate many human workers. With the ever increasing market demands, the table grape industry needs to adopt new technologies in order to stay competitive. The objective of …
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THESIS
Bars van tafeldruiwe met spesiale verwysing na Queen of the Vineyard
By: Meynhardt, JT
Year Awarded: 1956   Source: Stellenbosch University   View thesis
[No abstract]
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Botrytis cinerea bunch rot of table grapes : colonization and timing of fungicide application
By: De Kock, PJ
Year Awarded: 1989   Source: Stellenbosch University   View thesis
Colonization of table grape clusters by Botrytis cinerea, and the effects of various fungicide combinations on ~otrytis postharvest bunch rot of table grapes were investigated in a series of trials over a 5-year period. Fungicide dip treatments vs fungicide sprays, as an alternative to cover inner parts of closed clusters …
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THESIS
Cellular factors that affect table grape berry firmness
By: Du Plessis, BW
Year Awarded: 2008   Source: Stellenbosch University   View thesis
The South African table grape industry is under great pressure to produce table grapes of the best quality for the export markets. Quality defects such as poor colour, inadequate berry firmness, browning and soft tissue breakdown cause great losses in export. The firmness of table grapes is one of the …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Cooling and shipping studies on table grapes (Vitis vinifera L.)
By: Ngcobo, MEK
Year Awarded: 2008   Source: Stellenbosch University   View thesis
Fruit quality is the most important factor that determines prices for the fruit in the international markets. Although different consumers perceive quality differently there are quality variables that are always associated with poor quality by all consumers. In table grapes (Vitis vinifera L.) these variables may include overall appearance, stem …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Die invloed van verskillende SO2-behandelings by die bewaring van tafeldruiwe
By: De Swardt, GH
Year Awarded: 1962   Source: Stellenbosch University   View thesis
[No abstract]
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Economic efficiency of table grape production in Waterberg and Sekhukhune Districts, Limpopo Province, South Africa
By: Maponya, NM
Year Awarded: 2020   Source: University of Limpopo   View thesis
Table grape production plays an important role in the economy of many countries in Africa. It serves as a source of income for people who are engaged in its production and being one of the fields that is labour-intensive, thereby providing employment for many people. The aim of this study …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Effects of packaging and postharvest cooling on quality of table grapes (Vitis vinifera L.)
By: Du Plessis, SF
Year Awarded: 2003   Source: Stellenbosch University   View thesis
The table grape industry uses rapid cooling and packaging to protect grapes from desiccation and decay. Numerous packaging methods and combinations are used in the industry with each having their own advantages and disadvantages. Inferior postharvest grape quality can usually be ascribed to either deficient or excessive moisture in the …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Efficiency of irrigation practices for table grapes in the Hex River Valley
By: Eustice, T
Year Awarded: 2008   Source: Stellenbosch University   View thesis
In order to produce table grapes of export quality economically, irrigation must be practised conservatively without adversely affecting the crop. To use water as conservatively as possible effective irrigation scheduling practices must be applied. The highest water use efficiency (WUE) is only possible if irrigation scheduling practices lower the amount …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Manipulation of the taste of Regal Seedless (Vitis vinifera L.) table grapes
By: Fraser, WJ
Year Awarded: 2007   Source: Stellenbosch University   View thesis
Regal Seedless is a white, seedless grape which has the potential to become a profitable cultivar for the table grape producer since it has the advantages of early season harvesting and inherently large berries. There is, however, a downside to this cultivar, namely the seasonal occurrence of an unacceptable, astringent …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Non-destructive evaluation of external and internal table grape quality
By: Daniels, AJ
Year Awarded: 2021   Source: Stellenbosch University   View thesis
Determining the correct harvest maturity parameters of table grapes is an essential step before harvesting. The chemical analysis of table grapes to determine harvest and quality parameters such as total soluble solids (TSS), titratable acidity (TA) and pH, is very time-consuming, expensive, and destructive. Developing faster and more cost-effective methods …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Orthodox and alternative strategies to control postharvest decay in table grapes
By: Valentyn, A
Year Awarded: 2007   Source: Stellenbosch University   View thesis
More and more markets develop around the world for South African grapes and it becomes a challenge to store grapes for longer and reach the market with superior quality. The most destructive decay fungus, Botrytis cinerea can cause huge economic losses and successful postharvest control in the table grape industry …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Overcoming the logistical challenges faced by the South African table grape phytosanitary cold treatment markets: A case study focusing on the Hex River and Berg River production areas
By: Pienaar, MC
Year Awarded: 2021   Source: Stellenbosch University   View thesis
New phytosanitary cold treatment markets are opening and established markets are transforming to cold treatment markets. This poses a risk to the South African table grape industry, which is losing excessive amounts of money each year because of not complying with each market protocol. With the risks of markets closing, …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Postharvest berry split and abscission in 'Thompson Seedless' and 'Waltham Cross' table grapes
By: Burger, DA
Year Awarded: 2000   Source: Stellenbosch University   View thesis
Postharvest berry split and abscission are prevailing physiological disorders that negatively impact on the quality of table grapes exported from South Africa. Inferior grape quality due to these disorders results in a considerable decline in consumer confidence in the branded product, which leads to a drop in demand, and consequently, …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Staying ahead of the global pack : creating sustainable competitive advantage in the marketing of South African table grapes to the United Kingdom in the deregulated era
By: Symington, S
Year Awarded: 2008   Source: University of Cape Town   View thesis
This discourse uses three of Porter's competitiveness determinants to offer a number of interventions to the leadership of the South African table grape export industry. The first intervention considers how exporters can improve their relationships with the major UK supermarkets. It proposes that suppliers should increase their product penetration, deliver …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
The development of the horticultural industry in Namibia : an assessment of the determinants of the global market competitiveness of table grape production
By: Thomas, B
Year Awarded: 2007   Source: Stellenbosch University   View thesis
The declaration of Namibia’s independence from South Africa in 1990 has seen the Namibian government aim to plan and implement development programmes that enhance a growing agricultural sector. The new government is facing challenges regarding the addressing of inequalities of income and the allocation and distribution of resources, which have …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
The effect of partial rootzone drying and foliar nutrition on water use efficiency and quality of table grape cultivars Crimson seedless and Dauphine
By: Van Zyl, T
Year Awarded: 2007   Source: Stellenbosch University   View thesis
The South African and international table grape industries are growing rapidly, which necessitates the production of high quality export fruit at competitive production costs. For this reason, alternative irrigation methods are required to utilise water optimally while still attaining good quality table grapes. An increase in agricultural productivity may be …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
A comparison of container airflow technologies to improve temperature control along the table grape export supply chain : a South Africa to Netherlands case
By: Nel, NM
Year Awarded: 2023   Source: Stellenbosch University   View thesis
The South African table grape industry is significant as it plays a major role in terms of the economy and the growth of the country. It is, therefore, essential to maintain the high level of exports from South Africa and ensure that the quality of table grapes is maintained. Temperature …
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THESIS
A harvest and processing decision support system for table grape production
By: Wium, J
Year Awarded: 2023   Source: Stellenbosch University   View thesis
Harvesting and production decisions for large table grape producers are complex. Customers demand specific product requirements, based on the cultivar, packaging type, and grape quality. Harvest efforts by producers depend on the ripeness and volume of stock, which can change over time, justifying a constant modification in company-wide planning. This …
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THESIS
Alternaria rot of cold-stored table grapes : infection and latency of Alternaria alternata
By: Swart, AE
Year Awarded: 1990   Source: Stellenbosch University   View thesis
[No abstract]
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
An investigation into table grape risk factors that affect quality along the export supply chain
By: Rossouw, CG
Year Awarded: 2022   Source: Stellenbosch University   View thesis
Table grapes are a highly perishable product, where a large proportion of grapes produced for export to Europe arrive in a substandard condition. Fruit in this condition requires repacking to remove the rotten food parts, or in extreme cases, the entire shipment is dumped resulting in a total loss. Both …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Biocontrol of Botrytis cinerea on table grapes
By: Williamson, L
Year Awarded: 1997   Source: Stellenbosch University   View thesis
[No abstract]
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Effect of concentration, exposure time and temperature on the toxicity of sulphur dioxide (SO2) for Botrytis cinerea, a pathogen of table grapes
By: Mouton, P
Year Awarded: 1991   Source: Stellenbosch University   View thesis
[No abstract]
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Embryo culture and its application in table grape breeding
By: Burger, P
Year Awarded: 1992   Source: Stellenbosch University   View thesis
[No abstract]
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Evaluation of the effects of pesticides, used on table grapes, on the mealybug parasite, Coccidoxenoides peregrinus (Timberlake) (Hymenoptera: Encyrtidae)
By: Walton, VM
Year Awarded: 1998   Source: Stellenbosch University   View thesis
[No abstract]
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
In-package SO2 preservation of export table grapes
By: Opperman, WJ
Year Awarded: 1995   Source: Stellenbosch University   View thesis
[No abstract]
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Role of cell membrane integrity and oxidation stress in development of external browning of white seedless table grapes (Vitis vinifera L.)
By: Botes, WJ
Year Awarded: 2023   Source: Stellenbosch University   View thesis
Berry skin browning is an important quality problem in white seedless table grapes - it negatively affects the cosmetic appearance, causes reduced market value, financial losses and restricted market access. In a high browning incidence season the accumulation of saturated fatty acids (SFAs) and high levels of total sterols were …
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THESIS
The competitiveness of South African table grape exports in the European markets : threats from Peru and Chile
By: Van der Merwe, JM
Year Awarded: 2023   Source: Stellenbosch University   View thesis
International trade in table grapes has expanded remarkably over the last decade. In the Southern Hemisphere, rapid increases in supply from Peruvian producers have been observed, with Peru overtaking South Africa as the second-largest exporter in the Southern Hemisphere behind Chile. Chile and Peru’s main table market is the United …
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THESIS
The effect of four soil water regimes on the performance of Barlinka table grapes in the Hexriver Valley
By: Fourie, A
Year Awarded: 1989   Source: Stellenbosch University   View thesis
[No abstract]
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
The effect of different irrigation frequencies in combination with boron and calcium bunch applications on berry split of SoutherngrapeOne
By: Koekemoer, AL
Year Awarded: 2010   Source: Stellenbosch University   View thesis
The applied irrigation treatments resulted in different plant water status conditions. Separate applications of B and Ca treatments resulted in a decrease of B and Ca content in the flesh respectively. The control and combination treatment, of B and Ca resulted in the same of B and Ca content in …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Effect of shoot removal on bud fruitfulness and yield of Vitis vinifera cv. ‘Crimson Seedless’ in the Western Cape
By: Links, L
Year Awarded: 2014   Source: University of Pretoria   View thesis
‘Crimson Seedless’ (Vitis vinifera L.) is an attractive, late season, red, seedless cultivar, which is currently a very popular table grape cultivar. It is one of the most planted cultivars in South Africa and third in terms of total area of table grape vineyards in production. Mature ‘Crimson Seedless’ grapes …
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THESIS
Detection of grapevine fleck virus in South Africa
By: Usher, KA
Year Awarded: 2022   Source: Stellenbosch University   View thesis
Grapevine (Vitis spp.) is one of the oldest and most widely cultivated crops, however, it is highly susceptible to viral diseases, which result in significant crop losses. It is therefore necessary to gain insight into the pathogens and diseases that can impact vine health. Although grapevine fleck virus (GFkV) is …
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THESIS
Effect of post-harvest summer pruning on carbohydrate reserve status, bud break and fertility of Sultanina H5 in the Lower Orange River region
By: Toolo, KB
Year Awarded: 2022   Source: Stellenbosch University   View thesis
Carbohydrate reserves produced from photosynthesis are stored in perennial tissues of the grapevine in the form of starch and free-sugar fractions or soluble sugars, mostly sucrose, glucose, and fructose. These reserves are highly affected by viticultural practices altering the source-sink relationship in the grapevine. Post-harvest pruning is a practice widely …
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THESIS
Bunch quality and fertility of Vitis vinifera L. cv. Prime as affected by gibberellic acid (GA3) and s-abscisic acid (s-ABA)
By: Masikane, NN
Year Awarded: 2022   Source: Stellenbosch University   View thesis
Table grapes are one of the most cultivated, economically important fruit crops in the world and is one of the major fruit industries in South Africa. There is an increase competition in the market that leads to an increase production costs for South African table grape industry, to produce quality …
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THESIS
Evaluating the potential biological control of Margarodes prieskaensis using South African entomopathogenic fungi, and/or entomopathogenic nematodes
By: Erasmus, T
Year Awarded: 2023   Source: Stellenbosch University   View thesis
Margarodes prieskaensis (Jakubski) (Homoptera: Coccoidea: Margarodidae) occurs naturally in the Northern Cape, Limpopo and Mpumalanga in South Africa, where it is a serious pest on table and raisin grapes (Vitis vinifera L.) The larvae of M. prieskaensis feed on grapevine roots, causing poor growth and reduced vigor which eventually result …
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THESIS
Table grapes from vineyard to shelf: response of crimson seedless vines and grapes to water supply and micro-climate
By: Strydom, J
Year Awarded: 2025   Source: Stellenbosch University   View thesis
Technology development for advancement of the SA table grape industry requires detailed knowledge of grapevine behaviour and quality variables. Table grape production depends highly on irrigation. The use of overhead plastic covering (OPC) on especially high value cultivars, is expanding in the local cultivation regions. However, its impact on plant …
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THESIS
The financial impact of postharvest packaging on export table grapes focusing on shelf-life and fruit losses
By: Stringer, CJ
Year Awarded: 2024   Source: Stellenbosch University   View thesis
Grapes of inferior quality are not viewed as attractive to consumers. This causes reduced demand and prices for those grapes resulting in financial losses in highly competitive domestic and export markets. South Africa is the fourth-largest exporter of table grapes in the world. In South Africa, table grapes are mostly …
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Genetic analysis of downy and powdery mildew resistance in grapevine : a comparative study of 'Regent' and 'Red Globe' cultivars
By: Van Heerden, CJ
Year Awarded: 2025   Source: Stellenbosch University   View thesis
Fungal pathogens, causing powdery and downy mildew infections, have a large negative impact on grape production worldwide. Quantitative trait loci (QTL) mapping projects have identified several loci linked to the genetic factors responsible for resistance to these pathogens. Numerous studies focused on the cultivar ‘Regent’, which carries the resistance loci …
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THESIS
Molecular mapping of fruit quality traits in grapevine
By: Vervalle, JA
Year Awarded: 2025   Source: Stellenbosch University
Advanced genetic techniques are increasingly implemented for modern grapevine breeding. This study created a highly detailed genetic map to better understand the grapevine's DNA structure. By studying specific grape varieties, genetic markers and key genome regions linked to colour pigmentation, grape bunch formation and berry surface wax were found. Metabolic …
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THESIS
Investigation of the DMR6 susceptibility genes in grapevine for improving phytoplasma resistance through CRISPR/Cas9 technology
By: Holm, CC
Year Awarded: 2024   Source: Stellenbosch University   View thesis
Viticulture is considered one of the most important crop industries worldwide but is continually placed under pressure from a vast array of pathogens. Phytoplasma diseases are a critical challenge for the grapevine industry and cause considerable yield losses. Several breeding strategies aim to improve grapevine disease resistance through the introgression …
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THESIS
Fungal resistance genes in grapevine
By: Jordaan, K
Year Awarded: 2022   Source: Stellenbosch University
[No abstract]
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THESIS
Functional characterisation of polyphenol oxidase genes in grapevine for reduced enzymatic browning.
By: Wiese, N
Year Awarded: 2025   Source: Stellenbosch University
[No abstract]
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
Improving hot water treatment in grapevine nurseries by adding fungicides to prevent fungal infections
By: Engelbrecht, L
Year Awarded: 2023   Source: Stellenbosch University
[No abstract]
Recommend   Cultivar development Natural resource management Crop production Disease management Pest management Post-harvest management
THESIS
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