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Dissertations / Theses on the topic 'Grapes Diseases and pests Australia'

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Published: 4 June 2021

Last updated: 31 January 2023

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1

Constable, Fiona Elizabeth. "Biology and epidemiology of Australian grapevine phytoplasmas." Title page, contents and abstract only, 2002. http://web4.library.adelaide.edu.au/theses/09PH/09phc756.pdf.

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2

Evans, Katherine J. "Characterization of Uncinula necator, the grapevine powdery mildew fungus." Title page, contents and abstract only, 1996. http://web4.library.adelaide.edu.au/theses/09PH/09phe924.pdf.

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Bibliography: leaves 148-166. This study identifies genetic variation in Australian Uncinula necator populations. Techniques were developed for molecular and phenotypic markers for U. necator. Mating types of Australian clonal lines were identified and viable cleistothecia and infective ascospores were produced in vitro. The study establishes the foundation for investigating the population biology of U. necator, by identifying two distinct genetic groups, A and B, and micro-geographical variation among 35 clonal lines from various Australian viticultural regions.

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3

Williams, Mia Gabrielle. "Impact of environmental conditions on the infection behaviour of Western Australian strains of Plasmopara viticola, causal agent of downy mildew in grapevines." University of Western Australia. Soil Science and Plant Nutrition Discipline Group, 2006. http://theses.library.uwa.edu.au/adt-WU2006.0035.

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Downy mildew, caused by the biotrophic Oomycete Plasmopara viticola, is one of the most important diseases of grapevines world wide. It is particularly destructive in temperate viticultural regions that experience warm wet conditions during the vegetative growth of the vine (Wong et al., 2001). The disease is not normally a problem in mediterranean climates where the growing season tends to be hot and dry (Mullins et al., 1992; Sivasithamparam, 1993). Grape downy mildew is however a major disease in Australian viticulture (McLean et al., 1984; Magarey et al., 1991). Grape downy mildew was firs

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4

Fazeli, Claudia Fariba. "Molecular detection of grapevine leafroll associated closteroviruses (GLRaVs) and the genome organisation of GLRaV-1." 1998, 1998. http://web4.library.adelaide.edu.au/theses/09PH/09phf2868.pdf.

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5

Dennis, Jeremy Ian. "Chocolate spot of faba beans in South Australia." Title page, contents and summary only, 1991. http://web4.library.adelaide.edu.au/theses/09A/09ad411pdf.pdf.

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Bibliography: leaves 81-100. Entry of inoculum into a crop and disease development in the crop cannot be prevented because spores are airborne and there is a lack of highly resistant varieties. This makes complete control of chocolate spot unlikely. It should however, be possible to improve current levels of disease control through the integration of the factors identified in the study.

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6

Mostert, Lizel. "The characterization and control of Phomopsis cane and leaf spot on vine." Thesis, Stellenbosch : Stellenbosch University, 2000. http://hdl.handle.net/10019.1/51945.

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Thesis (MScAgric.)--Stellenbosch University, 2000.<br>ENGLISH ABSTRACT: Phomopsis cane and leaf spot disease of grapevine is an economically important disease in many of the vine-growing areas of the world. Four different Phomopsis spp. have previously been associated with this disease. The present study investigates the taxonomic significance of the different taxa found on grapevines in South Africa, as well as the endophytic growth and fungicide sensitivity of Phomopsis viticola isolates. The thesis is compiled of several different parts, which deal with specific, but related topics, a

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7

Gutschow, Minique. "Resistance to Botrytis cinerea in parts of leaves and bunches of grapevine." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52435.

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Thesis (MScAgric)--University of Stellenbosch, 2001.<br>ENGLISH ABSTRACT: 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 this study was (i) to determine natural B. cinerea infection at specific sites in leaves and bunches of grapevine at different phenological stages, and (ii) to determine resistance in the morphological parts to diseas

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8

Groenewald, Michelle. "Characterization and control of Phaeomoniella chlamydospora in grapevines." Thesis, Stellenbosch : Stellenbosch University, 2000. http://hdl.handle.net/10019.1/51650.

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Thesis (MScAgric)--University of Stellenbosch, 2000.<br>ENGLISH ABSTRACT: Petri grapevme decline, also known as black goo, slow die-back and Phaeoacremonium grapevine decline, causes significant losses of young vines worldwide. Species of Phaeoacremonium, Phaeomoniella chlamydospora and related genera are associated with this grapevine disease. This study investigates the Phaeoacremonium-complex and Phaeomoniella chlamydospora, focussing on the species isolated from grapevines. Fungicide sensitivity of Pa. chlamydospora and the possibility of employing molecular techniques for the detec

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9

Du, Preez Izak Frederik. "Infection pathways of Botrytis cinerea on selected wine grape cultivars." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/52889.

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Thesis (MScAgric)--University of Stellenbosch<br>ENGLISH ABSTRACT: 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 the plant surface. The deposition of clusters of conidia is not a common phenomenon in nature. The aim of this study was to investigate the infection pathways of (i) naturally- as well as (ii) artificially inocu

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10

Moyo, Mukani. "Molecular and phenotypic characterisation of grapevines expressing non-vinifera PGIP encoding genes." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6825.

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Thesis (MSc)--University of Stellenbosch, 2011.<br>ENGLISH ABSTRACT: Plants are constantly exposed to biotic and abiotic stress inducing factors that threaten their existence. Biotic factors such as pathogens are the cause of huge yield losses to crop plants worldwide with fungal pathogens debatably constituting the worst damage. Fungal pathogens such as Botrytis cinerea, which has a wide host range, release cell wall degrading enzymes called endopolygalacturonases (ePGs) during plant infection. These ePGs break down the pectin component of the cell wall, thus providing an entry route, as

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11

Boucher, T. Jude. "Japanese beetle Popillia japonica Newman: foliar feeding on wine grapes in Virginia." Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/71342.

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The natural infestation level for 1985 of the Japanese beetle, Popillia japonica Newman, in the Shenandoah Valley of Virginia failed to reduce berry quality, yield or shoot growth in a commercial vineyard. Intensive postveraison foliage feeding by Japanese beetle resulted 1n fruit with lower soluble solids and higher total titratable acidity at harvest, but did not affect pH, sugar per berry, berry weight, yield, leaves per vine or shoot length. Intensive previraison feeding also resulted in fruit with higher total titratable acidity. All other parameters were unaffected. I

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12

Freeborough, Michael-John 1971. "A pathogen-derived resistance strategy for the broad-spectrum control of grapevine leafroll-associated virus infection." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/53285.

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Thesis (PhD)--University of Stellenbosch, 2003.<br>ENGLISH ABSTRACT: Grapevine leafroll-associated virus-3 is one of ten members of the C/osteroviridae that are known to infect grapevine. Nine of these viruses are associated with grapevine leafroll disease, of which GLRaV-1 and GLRaV-3 are the most important and widespread. Members of the C/osteroviridae are unique amongst the viruses, as it is the only known family whose members encode a heat shock protein 70 kOa homolog (Hsp70h). The Hsp70h is a movement protein (MP) that is required for the active translocation of the virion structur

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13

De, Villiers Marelize. "Development of a pest management system for table grapes in the Hex River Valley." Thesis, Stellenbosch : University of Stellenbosch, 2006. http://hdl.handle.net/10019.1/1394.

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Thesis (PhD (Agric) (Conservation Ecology and Entomology))--University of Stellenbosch, 2006.<br>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 biological control of the phytophagous mites in vines. Life table studies for Epichoristodes acerbella (Walker), an important phytosanitary pest, were conducted to determine whether or not this pe

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14

Pryke, James Stephen. "Source and identity of insect contaminants in export consignments of table grapes." Thesis, Link to the online version, 2005. http://hdl.handle.net/10019/1169.

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15

Van, Niekerk Jan Marthinus. "Characterisation of pathogens associated with trunk diseases of grapevines." Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/49879.

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Thesis (MScAgric )--Stellenbosch University, 2004.<br>ENGLISH ABSTRACT: 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 genera have been regarded as synonymous, with the older name, Coniella, having priority. The most important species in the Coniellai/Pilidiella complex of grapevines

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16

Ferguson, Kaye. "The biology, ecology and management of the Quandong moth, Paraepermenia santaliella (Lepidoptera: Epermeniidae)." Title page, contents and summary only, 2001. http://web4.library.adelaide.edu.au/theses/09PH/09phf3523.pdf.

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Includes bibliographical references (leaves 217-230). Details the biology and life history of the Quandong moth and investigates management strategies that would enable growers to manage the pest in an economically and environmentally sustainable program.

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17

Malan, Stefanie. "Real time PCR as a versatile tool for virus detection and transgenic plant analysis." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/1921.

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Thesis (MSc (Genetics))--University of Stellenbosch, 2009.<br>ENGLISH ABSTRACT: South Africa is regarded as one of the top wine producing countries in the world. One of the threats to the sustainability of the wine industry is viral diseases of which Grapevine leafroll-associated virus 3 (GLRaV-3) and Grapevine virus A (GVA) are considered to be the most important and wide spread. Scion material is regularly tested for viruses; however scion material is often grafted onto rootstocks that have questionable phytosanitary status. Virus detection in rootstocks is challenging due to low and v

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18

Bester, Wilma. "Characterisation and management of trunk disease-causing pathogens on table grapevines." Thesis, Stellenbosch : Stellenbosch University, 2006. http://hdl.handle.net/10019.1/21550.

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Thesis (MScAgric)--University of Stellenbosch, 2006.<br>ENGLISH ABSTRACT: 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 determine the status and distribution of these pathogens and associated symptoms in climatically diverse table grape growing regions. Fifteen farms w

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19

Johnson, Raymond Camille Joseph. "Detection of nepoviruses by ELISA in tissue-cultured and field-grown grapevines." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/27968.

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The detection by serology of nematode-transmitted polyhedral viruses (nepoviruses) in grapevines is often unreliable. Nepoviruses were detected by enzyme-linked immunosorbent assay (ELISA) in tissue-cultured and field-grown grapevines. Nepovirus detection in in vitro plants (plantlets) was affected by virus distribution and growth room temperature. The reliability of virus detection in field-grown grapevines was improved when modified grinding buffers were used. Arabis mosaic virus (AMV) was detected by ELISA, for the first time, in in vitro grapevines initiated from field-and screenhouse-gro

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20

Van, Rooi Cicelia. "Infection by dry, airborne Botrytis cinerea conidia and fungicide efficacy on different parts of grape bunches and vinelets." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/52888.

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Thesis (MScAgric)--University of Stellenbosch, 2002.<br>ENGLISH ABSTRACT: 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 and bunch parts. It has been postulated that, following air and water dispersal, infection by solitary conidia should playa prominent role in the epidemiology of B. cinerea on grapev

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21

Holm, Kora. "Construction of a cDNA library for the vine mealybug, Planococcus ﬁcus (Signoret)". Thesis, Stellenbosch : Stellenbosch University, 2008. http://hdl.handle.net/10019.1/4083.

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Thesis (MSc (Genetics))--Stellenbosch University, 2008.<br>The vine mealybug, Planococcus ficus (Signoret), is a severe pest of grapevine in many grape and wine producing countries around the world. It is renowned not only for the considerable damage it infers to grapevine of its own accord, but in particular for its role in transmitting deleterious viral diseases such as grapevine leafroll disease, Kober stem grooving, Shiraz disease and corky bark. Incidentally, it is an exceptionally tenacious antagonist of grapevine, being resistant to both chemical and biological control mechanisms.

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22

White, John Gordon. "Control of rodent damage in Australian macadamia orchard systems." Thesis, Queensland University of Technology, 1999.

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23

Utami, Listiatie Budi. "Fungicides used to control septoria ampelina berk & curt leaf spot of vitis labrusca L. cv. 'concord'." Virtual Press, 1995. http://liblink.bsu.edu/uhtbin/catkey/941366.

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Septoria ampelina causes a disease of grapes known as septoria leaf spot. This study was done to determined which of the fungicides currently used to control the various diseases of grapes, plus one experimental fungicide, is the most effective in controlling septoria leaf spot. Both in vitro and in vivo methods were used. In vivo studies examined the systemic and/or protectant activities of the fungicides. The systemic and protectant fungicides included Bayleton, Benlate, Elite (an experimental fungicide), Nova, Rovral and Rubigan. The protectant only fungicides included Captan, Dithane and K

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24

White, Chana-Lee. "The characterization of the basidiomycetes and other fungi associated with esca of grapevines in South Africa." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/5319.

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Thesis (MSc (Plant Pathology))--University of Stellenbosch, 2010.<br>ENGLISH ABSTRACT: Esca is a disease affecting grapevines and is potentially devastating as there are economic losses due to a decrease in yield, wine quality and berry quality. Vineyards also need to be replaced earlier and therefore esca has a great impact on the wine, table grape and raisin industries. The disease is known to affect vineyards worldwide and has been studied extensively in Europe, but not in South Africa. Esca diseased grapevines were observed for the first time prior to 1981 in South African vineyards.

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25

Halleen, Francois. "Characterisation of Cylindrocarpon spp. associated with black foot disease of grapevine." Thesis, Stellenbosch : Stellenbosch University, 2005. http://hdl.handle.net/10019.1/21454.

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Dissertation (PhD (Agric))--University of Stellenbosch, 2005.<br>ENGLISH ABSTRACT: During the past few years a drastic reduction has been noted in the survival rate of grafted grapevines in nurseries, as well as in young vineyards in the Western Cape Province of South Africa. Circumstantial evidence suggested that Cylindrocarpon spp., which cause black foot disease of grapevine, were associated with this decline. Black foot disease of grapevine is a relatively new, and as yet poorly known disease affecting vines in various countries where grapevines are cultivated. Primary aims of this re

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26

Blignaut, Marguerite. "The molecular and biological characterisation of ORF5 of three South African variants of Grapevine Vitivirus A." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/2421.

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Thesis (MSc (Genetics))--University of Stellenbosch, 2009.<br>Grapevine Vitivirus A (GVA), genus Vitivirus, family Flexiviridae is a well characterised single-stranded RNA virus that has been implicated in the grapevine diseases, Kober stem grooving and Shiraz disease. The virus infects both its host, Vitis vinifera and the experimental model plant, Nicotiana spp.. Biological studies performed on the virus in its herbaceous host, Nicotiana benthami- ana, revealed that many divergent variants of the virus exists in South Africa and can induce di erent symptoms in the model plant. Further

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27

Volkmann, Anette (Anette Sigrid). "Suppression of Botrytis cinerea by antagonists in living, moribund and dead grapevine tissue." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52472.

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Thesis (MScAgric)--University of Stellenbosch, 2001.<br>ENGLISH ABSTRACT: Several attempts have been made to reduce Botrytis cinerea grey mould in vineyards and in storage by means of biological control. However, the so called "silver bullet" approach in utilising a single antagonist, has its limitations when compared with synthetic fungicides. Often the antagonist has a limited spectrum of activity and the duration of its effectiveness is less than that provided by synthetic fungicides. Furthermore, antagonists are more likely to be effective in preventing initial infection rather than

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28

Khan, Muhammad Shahid Akhtar. "Epidemiology of ascochyta blight of chickpea in Australia." Title page, contents and summary only, 1999. http://web4.library.adelaide.edu.au/theses/09PH/09phk4455.pdf.

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Bibliography: leaves 182-217. This study was conducted to determine the etiology of a blight disease of chickpea in south-eastern Australia and the factors affecting disease development. The disease had previously been identified as phoma blight. Pathogenicity testing revealed two isolates subsequently identified as Asochyta rabiei, the first conclusive identification in the southern hemisphere. Greenhouse screening of chickpea varieties identified types resistant to ascochyta blight. The effects of plant age and environmental conditions on disease development were investigated under controlle

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29

Nicol, Julie. "The distribution, pathogenicity and population dynamics of Pratylenchus thornei on wheat in South Australia." Title page, contents and summary only, 1996. http://web4.library.adelaide.edu.au/theses/09PH/09phn634.pdf.

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Bibliography: leaves 224-236. The study aimed to determine the distribution of both P. thornei and P. neglectus in South Australia. Also to study the field and laboratory population dynamics of P. thornei in relation to wheat yields, to determine its host range on a variety of cereal and non-leguminous hosts and to identify possible sources of nematode resistant wheat cultivars/varieties. Preliminary experiments studied the involvement of root rotting fungi with the nematode in wheat disease.

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30

De, Koker Wenhelene Crystal. "Molecular characterization of grapevine virus E in South Africa." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71709.

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Thesis (MSc)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: Grapevine virus E (GVE) is a newly identified virus that has been detected in an established vineyard in South Africa. This virus is a member of the genus Vitivirus, family Flexiviridae. Members of this genus are known to infecte grapevine and are associated with various disease complexes, such as the Rugose wood complex (RWC) and Shiraz disease (SD). However, the role and impact of GVE in South African vineyards are still unknown. It is important to study these viruses to determine how they infect and the possible impact they m

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31

Persley, Denis Michael. "Identification, epidemiology and control of Papaya ringspot virus, recently recorded in papaya (Caricus papaya) in Australia." Thesis, Queensland University of Technology, 1997. https://eprints.qut.edu.au/36937/1/36937_Persley_1997.pdf.

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Papaya (Carica papaya), originating in South America, is widely-grown throughout the tropical and sub-tropical regions of the world. The popularity and versatility of the fruit and commercial uses of papain obtained from papaya latex have made the crop an important component of cropping systems in many developing countries where 98% of production is centred. Papaya ringspot virus (PRSV) is the major limiting factor to papaya production in many countries, particularly those in SouthEast Asia and South America. Papaya ringspot disease was first detected in Queensland in 1991, with several comme

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32

Balali-Dehkordi, Gholam Reza. "Genetic variation of Rhizoctonia solani AG-3 in South Australia." Title page, contents and abstract only, 1996. http://web4.library.adelaide.edu.au/theses/09PH/09phb171.pdf.

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Three pages of addenda pasted inside back cover. Bibliography: leaves 166-189. Rhizoctonia solani is a complex species comprising morphologically basidiomycetous imperfect fungi. This study aimed to determine genetic diversity within R. solani AG-3 causing rhizoctonia disease of potato in South Australia. For this purpose, pectic zymogram, PCR, DNA fingerprinting and RFLP techniques were used in conjunction with traditional plant pathology procedures.

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33

Van, Coller Gerhardus J. (Gerhardus Johannes). "An investigation of soilborne fungi associated with roots and crowns of nursery grapevines." Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/49844.

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Thesis (MScAgric)--University of Stellenbosch, 2004.<br>ENGLISH ABSTRACT: Soilborne diseases of grapevines represent a complex problem with limited information available, both locally and internationally. Previous research in South Africa indicated that Phytophthora and Pythium spp. were the most widespread and devastating pathogens in grapevine nurseries and vineyards in the Western Cape province. The local grapevine industry is currently expanding; new cultivars, methods and agricultural chemicals are being used which can affect soilborne pathogens. It has therefore become necessary to

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34

Frost, William E. "The ecology of cereal rust mite Abacarus hystrix (Nalepa) in irrigated perennial dairy pastures in South Australia /." Title page, contents and summary only, 1995. http://web4.library.adelaide.edu.au/theses/09PH/09phf9398.pdf.

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Akiew, E. B. "Potato diseases in South Australia : studies in leafroll, early blight and bacterial wilt /." Title page, contents and summary only, 1985. http://web4.library.adelaide.edu.au/theses/09PH/09pha315.pdf.

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36

Carstens, Roleen. "The incidence and distribution of grapevine yellows disease in South African vineyards." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86683.

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Thesis (MSc)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: South Africa is ranked eighth in the world as far as international wine production is concerned and in terms of area under bearing vines South Africa is ranked 12th. In 2011 the wine industry contributed R4 204.4 million to the South African economy in state revenue from wine products. The importance of viticulture to the economy of South Africa forces the industry to limit the effect of all disease causing pathogens in order to keep their competitive edge. Aster yellows (AY) phytoplasma 16SrI-B subgroup was reported for th

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37

Liebenberg, Annerie. "The development of an enzyme linked immunosorbent assay for the detection of the South African strain(s) of grapevine fanleaf nepovirus." Thesis, Link to the online version, 2008. http://hdl.handle.net/10019/1909.

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38

Neethling, Jacob van der Westhuizen. "Biologiese beheer van plantparasitiese nematodes met die swam Paecilomyces lilacinus by aartappels, sitrus en wingerd." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/53311.

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Thesis (MSc)--Stellenbosch University, 2003.<br>ENGLISH ABSTRACT: Paecilomyces Ii/acinus, ras 251 (geregistreer in terme van wet 36 van 1947 as Suid-Afrika se eerste natuurlike nematisiede en kommersieel beskikbaar as PI Plus) is as biologiese beheer agent getoets by aartappels en in geïntegreerde beheer programme by sitrus en wingerd teen respektiewelik Me/oidogyne species, Ty/enchu/us semipenetrans en verskeie ektoparasitiese nematodes. Die swam toon belofte vir die beheer van hierdie nematodes en het terselfdertyd nie 'n nadelige effek op nie-teiken, voordelige organismes in die grond

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Hossain, Mohammad Abul. "Powdery mildew on barley : pathogen variability in South Australia : resistance genes in cv. Galleon /." Title page, contents and abstract only, 1986. http://web4.library.adelaide.edu.au/theses/09PH/09phh8287.pdf.

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40

Yakop, Uyek Malik. "Resistance of faba beans to Ascochyta blight." Title page, contents and summary only, 1998. http://web4.library.adelaide.edu.au/theses/09APSM/09apsmy15.pdf.

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Bibliography: leaves 111-120. This study investigated various aspects of genetic resistance in fava beans to Ascochta blight (A. fabae) with the objective to facilitate an efficient breeding strategy for long-term control. Pathogenic variability of A. fabae was found to be high, as was genetic variation between resistant fava bean accessions. A number of alternative resistance genes to that of Ascot cultivar were identified.

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Du, Preez Jacques. "The construction of an infectious clone of grapevine virus A (GV A)." Thesis, Link to the online version, 2005. http://hdl.handle.net/10019/1012.

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42

Le, Vieux Patrique Dayne. "Entomopathogenic nematodes for the control of the vine mealybug (Planococcus ficus) in South African wine and table grapes." Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/85640.

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Thesis (MSc)--Stellenbosch University, 2013.<br>ENGLISH ABSTRACT: 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 fruit being unmarketable. Many export grapes are rejected, prior to shipment, as a result of infestations and phytosanitary concerns with regard to mealybug

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De, Wet Owen. "Susceptibility of five strains of vine mealybugs, Planococcus ficus (Signoret), to chlorpyrifos." Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/70289.

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Thesis (MScAgric)--Stellenbosch University, 2004.<br>ENGLISH ABSTRACT: Colonies of Planococcus ficus (Signoret) were reared from three different areas, Hex River Valley, Robertson and Stellenbosch. An insectary colony and a table grape colony from Nietvoorbij experimental farm were also included in the study. A range of concentrations of chlorpyrifos was applied topically to individuals from the different colonies. The Stellenbosch population had the lowest LDso, although it was not significantly different from that of the insectary and Robertson colonies. The Hex River Valley and table

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Bester, Rachelle. "Sequencing and detection of a new strain of grapevine leafroll-associated virus 3 in South Africa." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71743.

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Thesis (MSc)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: Grapevine leafroll-associated virus 3 (GLRaV-3) is the type member of the genus Ampelovirus in the family Closteroviridae and is considered to be the main contributing agent of grapevine leafroll disease (GLD) worldwide. A metagenomic sequencing study of a grapevine leafroll-diseased vineyard led to the discovery of a new variant of GLRaV-3 in South Africa. This new variant was most related to a New Zealand isolate, NZ-1. In this study, we sequenced two isolates, GH11 and GH30, of the new variant group of GLRaV-3. These isolates

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Safodien, Sieyaam. "The molecular identification and characterisation of Eutypa dieback and a PCR-based assay for the detection of Eutypa and Botryosphaeriaceae species from grapevine in South Africa." Thesis, Stellenbosch : Stellenbosch University, 2007. http://hdl.handle.net/10019.1/21757.

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Thesis (MSc)--University of Stellenbosch, 2007.<br>ENGLISH ABSTRACT: Grapevine trunk diseases are caused by invasive pathogens that are responsible for the slow decline of vines. In particular, Eutypa dieback of grapevine has had a devastating impact on vineyards worldwide, reducing growth and yield, eventually killing the grapevine. The causal organism of Eutypa dieback was first described as Eutypa armeniacae Hansf. & Carter, the pathogen that causes dieback of apricots, but since 1987 this species has been considered a synonym of Eutypa lata (Pers.:Fr.) Tul & C. Tul (anamorph Libertel

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Engelbrecht, Rene. "The role of the mediterranean fruit fly, Ceratitis capitata, in Botrytis bunch rot of grape." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/53168.

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Thesis (MScAgric)--University of Stellenbosch, 2002.<br>ENGLISH ABSTRACT: 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, predisposing factors must play a fundamental role in primary infection and subsequent disease occurrence. Insects can play a very important role in this regard by depositing inocula at wound

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Van, Zyl Sybrand Abraham. "The use of adjuvants to improve fungicide spray deposition on grapevine foliage." Thesis, Stellenbosch : Stellenbosch University, 2009. http://hdl.handle.net/10019.1/4069.

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Thesis (MScAgric (Plant Pathology))--Stellenbosch University, 2009.<br>ENGLISH ABSTRACT: 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 attributed to poor qualitative deposition. The primary objective of spray technology is to optimise deposition, of which the plant surface is a critic

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Du, Plessis Kari. "Analysis of antifungal resistance phenotypes in transgenic grapevines." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71621.

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Thesis (MSc)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: The latest strategies in the protection of crops against microbial pathogens are rooted in harnessing the natural, highly complex defense mechanisms of plants through genetic engineering to ultimately reduce the application of chemical pesticides. This approach relies on an in-depth understanding of plant-pathogen interactions to develop reasonable strategies for plant improvement. Among the highly specialized defense mechanisms in the plant’s arsenal against pathogen attack, is the de novo production of proteinaceous antimicrob

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Koekemoer, Abraham Leander. "The effect of different irrigation frequencies in combination with boron and calcium bunch applications on berry split of SoutherngrapeOne." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/4215.

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Thesis (MScAgric (Viticulture and Oenology))--University of Stellenbosch, 2010.<br>ENGLISH ABSTRACT: The table grape industry employ a wide range of viticultural management practices in order to produce the high quality grapes demanded by the export market. A common contributor to degrading the quality of table grapes is the occurrence of berry split, which not only has an unattractive visual effect, but also increases the berries’ susceptibility to infection by spoilage organisms. A number of environmental conditions such as rainfall and humidity, and/or agricultural practices, such as

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Kruger, Daniel Hendrik Michau. "The role of cover crops with biofumigation potential for the suppression of plant-parasitic nematodes in vineyards." Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/85702.

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Thesis (MSc)--Stellenbosch University, 2013.<br>ENGLISH ABSTRACT: Plant-parasitic nematodes, consisting of a wide range of species, can cause severe economic losses in most agricultural food crops. Meloidogyne spp. (root-knot nematodes), Criconemoides xenoplax (ring nematode), Xiphinema index (dagger nematode) and Pratylenchus spp. (lesion nematodes) are some of the economically important plant-parasitic nematodes that pose a threat to viticulture and other perennial crops in South Africa. Worldwide there is ever-increasing pressure on pre-plant synthetic soil fumigants and post-plant nem

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