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

Author: Grafiati
Published: 4 June 2021
Last updated: 28 January 2023

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1

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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2

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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3

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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4

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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5

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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6

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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7

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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8

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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9

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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10

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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11

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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12

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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13

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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14

Walton, Vaughn M. (Vaughn Martin). "Development of an integrated pest management system for vine mealybug, Planococcus ficus (Signoret), in vineyards in the Western Cape Province, South Africa." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/53361.

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Dissertation (PhD)--University of Stellenbosch, 2003.<br>ENGLISH ABSTRACT: 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 reaching implications for the control of this important vine leafroll virus vector as control actions were focused on above ground control. Other mealybugs presently recorded in local vineyards included
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15

Brink, Johannes Cornelius (Jan-Cor). "Optimisation of fungicide spray coverage on grapevine and the incidence of Botrytis cinerea." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/20418.

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Thesis (PhD(Agric))--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: Despite adherence to fungicide spray schedules and label recommendations, table and wine grape producers invariably suffer crop losses when environmental conditions are conducive to fruit and foliar pathogens. Registered fungicides are effective and poor control is often attributed to: 1) improper spray timing, 2) reduced sensitivity to fungicides in the pathogen populations, and 3) poor spray deposition. Spray timing, management of fungicide resistance and the epidemiology of Botrytis cinerea have been thoroughly r
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16

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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17

Brink, Jan-Cor (Johannes Cornelius). "Quantification of spray coverage on grape bunch parts and the incidence of Botrytis cinerea." Thesis, Stellenbosch : Stellenbosch University, 2005. http://hdl.handle.net/10019.1/20915.

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Thesis (MScAgric)--University of Stellenbosch, 2005.<br>ENGLISH ABSTRACT: 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 the amount of B. cinerea at the various positions in bunches, and prevent infection and symptom expression at all growth stages. The same efficacy was, however, not achi
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18

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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19

Van, Schoor Jan Adriaan. "The ecology of Botrytis cinerea on grape in the Western Cape Province." Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/50138.

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Thesis (MScAgric)--University of Stellenbosch, 2004.<br>ENGLISH ABSTRACT: 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, and how the relationship is influenced by environmental and host factors. To better understand this relationship, information is needed on the period over which conidia have accumulated,
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20

Becker, John van Wyk 1975. "Evaluation of the role of PGIPs in plant defense responses." Thesis, Stellenbosch : Stellenbosch University, 2007. http://hdl.handle.net/10019.1/17476.

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Dissertation (PhD)--University of Stellenbosch, 2007.<br>ENGLISH ABSTRACT: 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 and pathogen alike. Studying the contribution of single genes and their encoded proteins to the molecular dialogue between plant and pathogen has been a focus of plant
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21

Elena, Jiménez Georgina. "Biologia i epidemiologia de fongs patògens de la fusta de la vinya i noves perspectives en el seu control = Biology and epidemiology of grapevine trunk pathogenic fungi and new perspectives on their control." Doctoral thesis, Universitat de Barcelona, 2015. http://hdl.handle.net/10803/329008.

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En les últimes dècades, les malalties de la fusta de la vinya han estat motiu d’una preocupació creixent, paral·lela a l’augment de la seva incidència arreu del món. En aquest context, l’objectiu global d’aquesta tesi ha estat el d’ampliar el coneixement de la biologia i l’epidemiologia d’aquestes malalties, així com el de valorar l’aplicació d’aquests nous coneixements en seu el control. Diferents espècies de fongs de la família Botryosphaeriaceae -entre elles, Diplodia seriata-, Eutypa lata i Phaeomoniella chlamydospora són alguns dels fongs patògens més importants. En un primer estudi es
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22

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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23

Terry, Alan J. "Control of pests and diseases." Thesis, University of Surrey, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.505965.

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24

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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25

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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26

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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27

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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28

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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29

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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Denman, Sandra. "Botryosphaeria diseases of proteaceae." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/52721.

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Dissertation (PhD (Agric))--University of Stellenbosch, 2002.<br>ENGLISH ABSTRACT: Fungi belonging to the genus Botryosphaeria are heterotrophic micromycetes that can be pathogens on woody plants. They cause serious, and in some cases devastating losses to crops through leaf necrosis, stem cankers and plant death. The Proteaceae cut-flower industry in South Africa accounts for 70% of the national cut-flower enterprise. Botryosphaeria diseases are a major impediment to production and trade of Proteaceae and there is an urgent need to investigate the etiology, epidemiology and control of t
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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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Wakgari, Waktola (Waktola Muleta). "Biology, ecology and management of white wax scale, Ceroplastes destructor Newstead (Hemiptera: Coccidae), on citrus and syzygium." Thesis, Stellenbosch : Stellenbosch University, 2000. http://hdl.handle.net/10019.1/51637.

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Thesis (PhD)--University of Stellenbosch, 2000.<br>ENGLISH ABSTRACT: The population density of the white wax scale, Ceroplastes destructor Newstead, has increased since 1994 in certain areas of Western and parts of Eastern Cape Provinces of South Africa where citrus is grown, particularly on Citrus reticulata (Blanco). A study was conducted to investigate its morphology, biology and ecology as contributions to the development of a sound integrated management programme. Characteristics of the immature stages and adult females were described and illustrated from field-collected and slide-
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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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Greiner, Blake William. "Inoculation and Spread of Dickeya in Potatoes." Thesis, North Dakota State University, 2019. https://hdl.handle.net/10365/29461.

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Field experiments were conducted in two different growing environments to evaluate the spread and movement of Dickeya dadantii. A procedure to inoculate seed potatoes with Dickeya dadantii was developed to use during this study. Spread of Dickeya dadantii from inoculated potato seed to healthy potato seed during the handling, cutting and planting procedures was not detected at either location. Spread of Dickeya dadantii from inoculated seed to surrounding progeny tubers in the field was documented in both locations. In Florida, 33% of progeny tubers tested positive for Dickeya using PCR, and i
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35

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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36

Valentyn, Aatika. "Orthodox and alternative strategies to control postharvest decay in table grapes." Thesis, Link to the online version, 2007. http://hdl.handle.net/10019/351.

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Windell, Nicole Elizabeth. "Leaf blackening and the control thereof in selected Protea species and cultivars." Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/20396.

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Thesis (MScAgric)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: Leaf blackening, a postharvest disorder which is characterized by a dark brown to black discoloration, is found in most commercially important Protea cut flower species and cultivars. As this disorder is known to increase with storage time, it is a major concern to the South African industry as the use of sea freight is increasingly preferred due to lower transport costs and a more favourable carbon footprint. The cause of leaf blackening has been strongly linked to a carbohydrate stress exerted by the large infloresce
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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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Shin, Hae Soo. "Effect of irrigation systems, partial root zone drying irrigation and regulated deficit, on plant parasitic nematode populations in grapevine." University of Western Australia. School of Earth and Geographical Sciences, 2006. http://theses.library.uwa.edu.au/adt-WU2006.0046.

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[Truncated abstract] Nematodes are known to significantly affect productivity of grapevines worldwide. Although major surveys have been carried out on nematodes infesting roots of grapevines elsewhere, only a preliminary survey has been carried out in Western Australia (W.A.). This study on the effect of irrigation systems on pathogenicity of nematodes on vines commenced with a survey of nematodes in two major grapegrowing regions of W.A. In this survey, soil samples were taken from 5 vineyards from Margaret River and 7 vineyards from Swan Valley regions of the state. Root-knot nematode (Meloi
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Heunis, J. M. (Juanita Maria). "The influence of synthetic pyrethroids on phytophagous mites and their natural enemies in apple orchards." Thesis, Stellenbosch : Stellenbosch University, 1992. http://hdl.handle.net/10019.1/69805.

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Thesis (MSc)--Stellenbosch University, 1992.<br>One copy microfiche.<br>ENGLISH ABSTRACT: The effects of synthetic pyrethroids on the spider mite, Tetranychus urticae Koch, and its natural enemies was investigated. The pyrethroid cyfluthrin, sprayed for the control of fruit weevil Phlyctinus callosus, did not cause mite outbreaks and was not harmful to the predators when sprayed before they appeared on the apple trees. This spray also gave good control of thrips, bollworm (Heliothis armigera) and fruit weevil (P. callosus). A late season spray of deltamethrin against codling moth, cause
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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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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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Odendaal, Deidre. "Orchard and bin treatment with entomopathogenic nematodes (Rhabditida: Steinernematidae and Heterorhabditidae) for the control of the codling moth (Cydia pomonella)." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/97962.

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Thesis (MSc)--Stellenbosch University, 2015.<br>ENGLISH ABSTRACT: The codling moth, Cydia pomonella (Lepidoptera: Tortricidae), is the key pest of apples and pears worldwide. The withdrawal of certain fundamental chemicals from codling moth management spray programmes, due to concerns about human, environmental and ecosystem health, has resulted in the search for softer, more environmentally friendly, and safer control measures. Entomopathogenic nematodes (EPNs), naturally occur in the soil, and actively search for hosts. The interest in using EPNs from the families Heterorhabditidae and Stein
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Ceballo, Flor Angel Aquino. "An investigation into why coccidoxenoides peregrinus (timberlake) (hymenoptera:encyrtidae) is an effective biological control agent in Queensland citrus /." St. Lucia, Qld, 2001. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16498.pdf.

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Opoku-Debrah, John Kwadwo. "Geographic variation in the susceptibility of false colding Moth, Thaumatotibia Leucotreta, populations to a granulovirus (CrleGV-SA)." Thesis, Nelson Mandela Metropolitan University, 2008. http://hdl.handle.net/10948/984.

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The false codling moth (FCM), Thaumatotibia (=Cryptophlebia) leucotreta (Meyrick) (Lepidoptera: Tortricidae) is a serious pest of citrus and other crops in Sub-Saharan Africa. The introduction of the Cryptophlebia leucotreta granulovirus (CrleGV-SA) Cryptogran and Cryptex (biopesticides) has proven to be very effective in the control of FCM. However, markedly lower susceptibility of some codling moth (CM), Cydia pomonella (L.) populations to Cydia pomonella granulovirus (CpGV-M), another granulovirus product used in the control of CM’s in Europe have been reported. Genetic differences between
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Kirkman, Wayne. "Understanding and improving the residual efficacy of the cryptophlebia leucotreta granulovirus (Cryptogran)." Thesis, Rhodes University, 2008. http://hdl.handle.net/10962/d1005482.

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False codling moth (FCM), Thaumatotibia (=Cryptophlebia) leucotreta (Meyr) (Lepidoptera: Tortricidae), is one of the most important pests on citrus. The Cryptophlebia leucotreta granulovirus (CrleGV) has been developed into a successful biological control agent, registered under the name Cryptogran, and is currently the preferred product for the control of FCM on citrus in South Africa. A prerequisite to the continued success of Cryptogran as a means of controlling false codling moth is to understand the factors affecting field persistence of the virus, and to find ways to improve it. The aim
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Moore, Sean Douglas. "The development and evaluation of Cryptophlebia Leucotreta granulovirus (CrleGV) as a biological control agent for the management of false codling moth, Cryptophlebia Leucotreta, on citrus." Thesis, Rhodes University, 2003. http://hdl.handle.net/10962/d1004001.

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A granulovirus isolated from Cryptophlebia leucotreta larvae was shown through restriction endonuclease analysis to be a novel strain (CrleGV-SA). No more than one isolate could be identified from a laboratory culture of C. leucotreta. However, a preliminary examination of restricted DNA profiles of isolates from different geographical regions indicated some minor differences. In surface dose bioassays on artificial diet, LC50 and LC90 values with neonate larvae were estimated to be 4.095 x 103 OBs/ml and 1.185 x 105 OBs/ml respectively. LT50 and LT90 values with neonate larvae were estimated
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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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Rodas, Pelaez C. A. (Carlos Alberto). "Important pests and diseases of plantation grown Pinus and Eucalyptus in Colombia and their control." Thesis, University of Pretoria, 2013. http://hdl.handle.net/2263/32968.

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Colombia covers an area of approximately 114 million hectares (ha) of which the potential forestly land has been estimated at 60.7 million ha, about 53% of the total area. Only 54 million ha are considered as natural forest, leaving approximately 29 million ha to be used for livestock and agriculture. In order to provide an alternative source of timber, Colombian groups have planted approximately 327 000 ha to different species of Pinus, Eucalyptus and native species. This clearly represents only a small proportion of the total area that might be used for forestry, which is set to grow
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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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