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Dissertations / Theses on the topic 'Plant disease control'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Heard, Stephanie. "Plant pathogen sensing for early disease control." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/plant-pathogen-sensing-for-early-disease-control(48949f80-2596-4ce2-912a-6513e72f6a8d).html.

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Sclerotinia sclerotiorum, a fungal pathogen of over 400 plant species has been estimated to cost UK based farmers approximately £20 million per year during severe outbreak (Oerke and Dehne 2004). S. sclerotiorum disease incidence is difficult to predict as outbreaks are often sporadic. Ascospores released from the fruiting bodies or apothecia can be dispersed for tens of kilometres. This makes disease control problematic and with no S. sclerotiorum resistant varieties available, growers are forced to spray fungicides up to three times per flowering season in anticipation of the arrival of this

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2

West, Helen. "Control of fungal plant disease using inhibitors of polyamine biosynthesis." Thesis, University of Glasgow, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389895.

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3

West, Jon. "Chemical control of Armillaria root rot." Thesis, University of Reading, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386565.

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4

Raziq, Fazli. "Biological and integrated control of the root rot caused by Armillaria mellea." Thesis, University of Reading, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245321.

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5

Way, John Alexander. "Investigating a microbial fungicide to enhance biological control of plant disease." Thesis, University of Surrey, 2000. http://epubs.surrey.ac.uk/843864/.

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The antibiotic, 2,4-diacetylphloroglucinol (Phl), is produced by a range of naturally isolated fluorescent pseudomonads, found in disease suppressive soils. The natural isolate, P. fluorescens F113, protects pea plants from the pathogenic fungus, Pythium ultimum, by reducing the number of pathogenic lesions on the plant's roots. This beneficial effect was however, outweighed by the F113 causing an overall reduction in the emergence of the pea plants in the infected soil. The gene locus responsible for the Phl production was shown to be functionally conserved between the P. fluorescens F113 and

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6

Wilson, Mark. "Epidemiology and biological control of fire blight of hawthorn." Thesis, University of Manchester, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.237267.

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7

Kotze, Charl. "Biological control of the grapevine trunk disease pathogens : pruning wound protection." Thesis, Stellenbosch : Stellenbosch University, 2008. http://hdl.handle.net/10019.1/2117.

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Thesis (MScAgric (Plant Pathology))--Stellenbosch University, 2008.<br>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 wide range of symptoms developing that includes stunted growth, cankers and several types of wood necrosis. Pruning wounds stay susceptible for 2 to 16

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Hutchins, John David. "Antagonism of the stem rot pathogen (Sclerotina sclerotiorum) by microorganisms from oilseed rape flowers : prospects for biological control." Thesis, Imperial College London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.281747.

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9

Timney, David. "The role of the physical properties of fungicides in controlling root rot in tomatoes caused by Phytophthora capsici Leonian." Thesis, University of Reading, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239555.

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10

Groves, J. D. "Botrytis cinerea tubulin and its use in the development of an immunodiagnostic test for benzimidazole fungicide resistance." Thesis, University of Reading, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234477.

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11

Stevenson, Leonard. "A molecular basis for the biological control activity of a pseudomonas fluorescens strain." Thesis, University of Bristol, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240424.

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12

Warmington, Rachel Julie. "Pathogen diversity, epidemiology and control of sclerotinia disease in vegetable crops." Thesis, University of Warwick, 2014. http://wrap.warwick.ac.uk/67709/.

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Sclerotinia sclerotiorum is a necrotrophic fungal pathogen with a worldwide distribution and a wide host range, including many economically important crops. The control strategies for this pathogen and related species include using fungicides, biological control agents and cultural practices such as crop rotations. However, the genetic diversity and the long term survival structures (sclerotia) of this pathogen, combined with the recent discovery of the related species S. subarctica in England and the need for growers to implement integrated disease management strategies means that new control

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13

Wallenhammar, Ann-Charlotte. "Monitoring and control of Plasmodiophora brassicae in spring oilseed brassica crops /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 1999. http://epsilon.slu.se/avh/1999/91-576-5726-2.pdf.

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14

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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15

Read, Peter James. "Epidemiology, effects and control of black dot disease of potato caused by the fungus Colletotrichum coccodes." Thesis, Cranfield University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359622.

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16

Forsberg, Gustaf. "Control of cereal seed-borne diseases by hot humid air seed treatment /." Uppsala : Dept. of Plant Pathology and Biocontrol Unit, Swedish Univ. of Agricultural Sciences, 2004. http://epsilon.slu.se/a443.pdf.

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Pretorius, Mathys Cornelius. "Epidemiology and control of Pseudocercospora angolensis fruit and leaf spot disease on citrus in Zimbabwe." Thesis, Stellenbosch : Stellenbosch University, 2005. http://hdl.handle.net/10019.1/20938.

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Thesis (MScAgric)--University of Stellenbosch, 2005.<br>ENGLISH ABSTRACT: Fruit and Leaf Spot Disease (FLSD) of citrus, caused by Phaeoramularia angolensis, is found only in 18 countries in Africa, the Comores Islands in the Indian Ocean and Yemen in the Arabian peninsula. The major citrus export countries in Africa are Morocco, South Africa, Swaziland, and Zimbabwe. Zimbabwe is the only country affected by FLSD. FLSD is a disease of major phytosanitary and economic importance and its devastating effect on citrus is highlighted by the fact that the damage is cosmetic, which renders the fr

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18

Willekens, Jeroen. "Mechanism of vector resistance in groundnut to control groundnut rosette virus disease in Sub-Saharan Africa." Thesis, University of Greenwich, 2003. http://gala.gre.ac.uk/6344/.

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Analysis of biological performance parameters of Aphis craccivora on groundnut variety ICG12991 in laboratory and field trials demonstrated that ICG12991 was resistant to the aphid vector of groundnut rosette diseases and that this resistance was stable over time and under high aphid pressure. Feeding experiments related slow population development and high aphid mortality on ICG 12991 to an inhibition of phloem feeding from the sieve elements. Consequently, virus transmission of all three agents of rosette disease was almost totally absent even under very high pressure of viruliferous aphids.

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Andersson, Robert. "Characterisation of regulatory genes involved in the control of virulence determinants in Erwinia carotovora subsp. carotovora /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 1999. http://epsilon.slu.se/avh/1999/91-576-5732-7.pdf.

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20

Ross, Ian Lindsay. "Mechanisms of biocontrol of Gaeumannomyces graminis var. tritici by Pseudomonas corrugata strain 2140 : genetic and biochemical aspects." Title page, table of contents and summary only, 1996. http://web4.library.adelaide.edu.au/theses/09PH/09phr824.pdf.

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Bibliography: leaves 207-220. Pseudomonas corrigata strain 2140 (Pc2140), isolated from wheat field soil in Australia, antagonises the take-all fungus, Gaeumannomyces graminis var. tritici (Ggt) in vitro and significantly reduces take-all symptoms on wheat in pot trials. This study investigates the mechanisms by which the biocontrol agent reduces the disease symptoms. Biochemical analysis of metabolites of P. corrugata 2140 reveal a number of compounds potentially antagonistic to Ggt and which may play a role in disease control. These include water-soluble antibiotics, siderophores, proteases,

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21

Mohamed, Maizatul-Suriza. "Phytophthora palmivora, the causal agent of bud rot disease of oil palm (Elaeis guineensis Jacq.) : biology, detection and control." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/41678/.

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Bud rot disease has been considered as a devastating disease of oil palm in Latin America. Severe outbreaks of this disease have been reported in Colombia, Brazil, Ecuador, Panama and Suriname. The causal agent of bud rot disease in Colombia has been identified as Phytophthora palmivora. This pathogen is known to be responsible for several tropical diseases such as black pod and stem canker disease of cocoa, especially during the rainy season. Phytophthora palmivora has also been reported to attack durian, rubber, pepper and jackfruit causing diseases in various parts of the plant such as frui

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22

Aada, Abdallah. "Identification of pathogens and control of spot blotch disease of barley (Hordeum vulgare) by combining plant resistance and biological control." Thesis, University of Newcastle upon Tyne, 2013. http://hdl.handle.net/10443/2148.

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Spot blotch is one of the most important diseases of barley (Hordeum vulgare) in Libya and worldwide. The overall aim of this study was to investigate the potential of biological control in combination with disease resistance to control spot blotch without the potential hazards of chemical application. Fungi were isolated from barley plants with spot blotch symptoms from different areas in Libya. As well as the commonly known spot blotch pathogen Bipolaris sorokiniana (teleomorph Cochliobolus sativus), Bipolaris spicifera (teleomorph Cochliobolus spicifer), Curvularia inaequalis, and Alternari

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Giampan, José Segundo. "Infectividade e proteção de três estirpes fracas do Papaya ringspot virus em plantas de melancia." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/11/11135/tde-25022003-134805/.

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Este trabalho teve como objetivo avaliar a infectividade de estirpes fracas do Papaya ringspot virus - type W (PRSV-W) em plantas de melancia (Citrullus lanatus), em função da origem da estirpe fraca, da concentração e da espécie doadora do inóculo e da idade da planta-teste de melancia, inoculada mecanicamente. Também foi avaliado o efeito protetor dessas estirpes em plantas de melancia em casa de vegetação e em campo. A seleção de estirpes fracas do PRSV-W foi feita a partir de bolhas de folhas de melancia infectadas naturalmente em campo. A infectividade da estirpe fraca selecionada foi com

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24

Scott, George. "Hormetic UV treatments for control of plant diseases on protected edible crops." Thesis, Loughborough University, 2017. https://dspace.lboro.ac.uk/2134/28305.

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Hormesis is a dose response phenomenon where low doses of a stress bring about a positive response in the organism undergoing treatment. UV-C hormesis has been known for over three decades and has a broad range of benefits on postharvest produce. Benefits include increased nutritional content, delayed chlorophyll degradation and disease resistance. The beneficial effects have been observed on many varieties of fresh produce including climacteric and non-climacteric fruit, tubers, salads and brassicas. The majority of previous studies have used low-intensity (LIUV) UV-C sources. LIUV sources re

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Tsumanuma, Guy Mitsuyuki. "Controle de ferrugem asiática e desempenho de duas cultivares de soja submetidas a diferentes fungicidas e épocas de aplicações." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/11/11136/tde-14042009-092855/.

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O fungo Phakopsora pachyrhizi Syd. & Syd, representa grande ameaça à sojicultura nas principais regiões produtoras do mundo, onde perdas significativas foram relatadas. Na quantificação de danos causados por esta doença muitas são as variáveis a serem estudadas como Área abaixo da curva de progresso da doença (AACPD), Absorção da área foliar sadia (HAA) e Duração da área foliar sadia (HAD), além das curvas de progresso da doença. Visando seu controle químico torna-se necessário a aplicação de defensivos agrícolas, os quais podem afetar o crescimento e metabolismo das plantas, resultando em con

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26

Chen, Chunquan 1958. "Induced systemic resistance against Pythium aphanidermatum by plant growth-promoting rhizobacteria on cucumber (Cucumis sativus L.)." Thesis, McGill University, 1998. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=35862.

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Cucumber root rot caused by Pythium aphanidermatum can be suppressed by introduced plant growth-promoting rhizobacteria (PGPR). Preliminary experiments clarified that this root disease could be suppressed by strains of Pseudomonas aureofaciens, P. corrugata, and P. fluorescens. To determine whether the mechanism was a systemic resistance induced by PGPR, a split root technique was employed on greenhouse cucumbers grown in soilless substrates. On the split roots, bacteria which were introduced into one side of the root were completely separated from pathogen challenged-inoculated roots-on the o

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Olsen, Mary W., and Deborah Young. "Comandra Blister Rust." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2009. http://hdl.handle.net/10150/146721.

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3 pp.<br>Mondell pine should not be planted within a mile of Comandra populations. Infection of pine occurs through needles by spores produced on Comandra, but spores produced on pine cannot re-infect pine. This article gives information about the disease cycle, the symptoms and prevention and control methods for blister rust.

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Chidburee, Siripun. "Biological control of soil-borne disease in soybean by denitrifying antagonistic bacteria : the possible role of reduced nitrogen compounds for control of plant pathogens." Thesis, University of Aberdeen, 1998. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU602299.

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A number of experiments were carried out to study the potential of denitrifying bacteria and reduced nitrogen compounds for control of soil-borne damping-off pathogens. Measurement of the rhizosphere pH of growing soybean roots was carried out in soil adjusted to different pH states and packed into sheet microcosms. The results showed that the rhizosphere pH of soybean was lower than the bulk soil. Nitrate reductase activity and nitrite production was then characterised for the rhizosphere of intact 14 day-old soybean roots that were incubated in nitrate substrates adjusted to different pH val

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Neher, Oliver Thomas. "Disease control and plant defense pathways induced by Bacillus mojavensis isolate 203-7 and Bacillus mycoides isolate BMJ." Thesis, Montana State University, 2008. http://etd.lib.montana.edu/etd/2008/neher/NeherO1208.pdf.

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The objective of this study was to investigate the plant defense pathways induced by Bacillus mojavensis isolate 203-7 (203-7) and B. mycoides isolate BmJ (BmJ) and to test their ability to control fungal pathogens on tomato and cucumber by means of systemic acquired resistance (SAR). An Arabidopsis thaliana mutant - Botrytis cinerea pathosystem was used to investigate plant defense pathways activated by 203-7 and BmJ. A. thaliana wild type (Col-0), ein2-1, jar1-1, NahG, ndr1-1/npr1-2, and npr1-1 mutants were induced by application of bacilli, distilled water, or chemical inducers. Both bacill

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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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Ntushelo, Khayalethu. "Comparative studies on genetic variability and fungicide resistance in Tapesia yallundae." Thesis, Stellenbosch : Stellenbosch University, 1998. http://hdl.handle.net/10019.1/55834.

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Thesis (MScAgric)--Stellenbosch University, 1998.<br>ENGLISH ABSTRACT: Eyespot is an important disease of spring wheat (Triticum aestivum L.). Four species of Ramulispora are associated with this disease, of which Tapesia yallundae and T. acuformis. are common. This thesis investigates the broader subjects of genetic variability, reproductive dynamics and fungicide resistance in Tapesia yallundae. Each of the chapters treats specific but related topics. T. yallundae, which is the only species thus far reported from South Africa, has been associated with yield losses of up to 50%. To ena

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Gouvêa, Marina Mengardo. "Efeito de inseticidas no controle das transmissões primária e secundária do Tomato severe rugose virus (ToSRV) para tomateiro por Bemisia tabaci biótipo B." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/11/11135/tde-20102015-152947/.

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O mosaico rugoso, causado pelo begomovirus ToSRV, é uma das principais doenças do tomateiro. Neste trabalho avaliou-se a eficácia de quatro inseticidas, ciantranilliprole foliar, ciantraniliprole solo, espiromesifeno e tiametoxam no controle das infecções primária e secundária do ToSRV, em tomateiros, transmitido por Bemisia tabaci biótipo B. Os tratamentos, confinados separadamente em gaiolas a prova de insetos, foram: controle, representado por tomateiros sadios e infectados, pulverizados com água, mais insetos avirulíferos; infecção primária, simulada com tomateiros sadios pulverizados com

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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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Fatema, Kaneez. "The effect of silicon on strawberry plants and its role in reducing infection by Podosphaera aphanis." Thesis, University of Hertfordshire, 2014. http://hdl.handle.net/2299/14445.

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Podosphaera aphanis which causes powdery mildew of strawberry is of economic importance in strawberry production in United Kingdom as it affects yield and fruit quality. Silicon has been shown to reduce the severity of a number of plant diseases. In strawberry, the mechanism of suppression against powdery mildew remains uncertain. Therefore, it has been suggested that supplying silicon would help strawberry plants to absorb silicon and improve resistance against the pathogen. The silicon based wetter Omex SW7 was used and three different concentrations of silicon wetter were applied on the lea

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Junior, Geraldo José da Silva. "Podridão floral dos citros: dinâmicas temporal e espacial, sensibilidade de Colletotrichum acutatum a fungicidas e controle da doença." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/11/11135/tde-13092011-095157/.

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A Podridão Floral dos Citros (PFC), causada por Colletotrichum acutatum, foi observada em 1956/57 em Belize e relatada posteriormente em 1979. Neste mesmo ano a PFC também foi relatada no Brasil e, desde então, tem causado prejuízos todas às vezes nas quais o período de florescimento coincide com a ocorrência de chuvas. O controle da PFC é realizado principalmente por meio de pulverizações preventivas com fungicidas. O uso indiscriminado de fungicidas com o mesmo modo de ação pode selecionar indivíduos resistentes. O conhecimento da epidemiologia da PFC pode gerar informações precisas a serem

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Carter, Mel. "Investigating novel approaches for the integrated control of the soilborne strawberry pathogens Macrophomina phaseolina and Fusarium oxysporum f. sp. fragariae." DigitalCommons@CalPoly, 2016. https://digitalcommons.calpoly.edu/theses/1628.

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Macrophomina phaseolina (Mp) and Fusarium oxysporum f. sp. fragariae (Fof) are emerging soilborne pathogens causing crown rot and Fusarium wilt, respectively, in commercial strawberry production in California. Fungicides representing eight active ingredients from four different mode of action groups (FRAC groups 1, 3, 7 and 12) were evaluated for their efficacy against each pathogen in vitro and each disease in planta. Fungicide active ingredients were evaluated for their ability to inhibit mycelial growth of both pathogens in vitro. Half-strength potato dextrose agar was amended with six diff

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Lima, Renato Ribeiro de. "Modelagem espaço-temporal para dados de incidência de doenças em plantas." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/11/11134/tde-23052005-164227/.

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A informação sobre a dinâmica espaço-temporal de doenças de plantas é de importância fundamental em estudos epidemiológicos, podendo ser utilizada para descrever e entender o desenvolvimento das doenças, desenvolver planos de amostragem, planejar experimentos controlados e caracterizar perdas na produção ocasionadas pela doença. O estudo de padrões espaciais de doenças de plantas, que são reflexos do processo de dispersão dos patógenos, é importante em estudos epidemiológicos, como o de doenças dos citros, para se definirem estratégias mais adequadas para o controle das doenças, diminuindo o

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Gonçalves, Fabrício Packer. "Quantificação de danos e controle pós-colheita de podridão parda (Monilinia fructicola) e podridão mole (Rhizopus stolonifer) em frutos de ameixa e nectarina." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/11/11135/tde-09032006-155041/.

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Esse trabalho teve dois objetivos distintos, quantificar e caracterizar os danos pós-colheita em frutos de ameixa e nectarina na Companhia de Entrepostos e Armazéns Gerais de São Paulo (CEAGESP) e testar produtos que possam ser utilizados no controle das doenças pós-colheita podridão parda (Monilinia fructicola) e podridão mole (Rhizopus stolonifer) nestes dois frutos. Durante a safra 2003 e 2004, foram realizados 20 levantamentos de quantificação de danos em frutos de nectarina e 11 em frutos de ameixa. Em cada levantamento foram avaliados 1% do total de caixas comercializados em cinco perm

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Cropper, Kenneth Lee. "TOWARDS REDUCING FUNGICIDE USE IN THE CONTROL OF DOLLAR SPOT (SCLEROTINIA HOMOEOCARPA F.T. BENNETT) DISEASE ON CREEPING BENTGRASS (AGROSTIS STOLONIFERA L.)." UKnowledge, 2009. http://uknowledge.uky.edu/gradschool_theses/597.

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Creeping bentgrass (Agrostis stolonifera L.) is commonly used on golf course greens and fairways in cool-humid regions but is plagued by numerous fungal diseases, one of which is dollar spot disease (Sclerotinia homoeocarpa F. T. Bennett). Dollar spot occurs frequently throughout the growing season requiring biweekly fungicide applications for complete control. The objective of this study was to investigate methods of reducing the number of fungicide applications needed to maintain dollar spot at acceptable levels through dew removal and potential mechanisms of resistance in bentgrass. In the

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Chapola, Roberto Giacomini. "Controle da podridão abacaxi da cana-de-açúcar por meio da pulverização de fungicidas em mudas no sulco de plantio." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/11/11135/tde-11022011-153008/.

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Nos últimos anos, o plantio mecanizado da cana-de-açúcar vem sendo cada vez mais utilizado no Brasil. Tal sistema possui menor custo sobre o convencional e viabiliza o plantio durante o ano todo. Entretanto, a maior quantidade de ferimentos nas mudas colhidas mecanicamente e a realização de plantios em períodos frios e com umidade do solo inadequada têm aumentado a incidência da podridão abacaxi, doença causada pelo fungo Thielaviopsis paradoxa. Áreas onde esta doença é problemática apresentam muitas falhas, exigindo, em alguns casos, replantio. Thielaviopsis paradoxa penetra nas mudas através

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Auer, Susann. "Biological control of clubroot (Plasmodiophora brassicae) by an endophytic fungus (Acremonium alternatum)." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-179368.

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The biological control of plant pests with beneficial microbes has become increasingly important over the last decades. Soil microbes such as fungi and bacteria colonise the roots of plants and promote their growth. Some beneficial microbes can trigger a weak plant defence response that enhances the immune response of the plant at subsequent pathogen attacks and therefore increase the resistance of the plant to other invaders. This mechanism is called “priming”. While biocontrol agents are applied against a variety of plant pests fundamental knowledge of the molecular mechanisms of plant-micro

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Cia, Patricia. "Avaliação de agentes bióticos e abióticos na indução de resistência e no controle pós-colheita de antracnose (Colletotrichum gloeosporioides) em mamão (Carica papaya)." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/11/11135/tde-03042006-165955/.

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Este trabalho teve como principais objetivos avaliar os efeitos dos agentes bióticos (Saccharomyces cerevisiae, Bacillus thuringiensis, Lentinula edodes e Agaricus blazei), e abióticos (UV-C, irradiação gama, acibenzolar-S-metil, quitosana, ácidos acético e salicílico) na proteção de mamões contra C. gloeosporioides, bem como estudar os mecanismos bioquímicos de resistência ativados no tecido vegetal, em resposta ao tratamento com os agentes de maior eficiência, além de investigar os efeitos destes sobre o desenvolvimento in vitro do fungo. Para tanto, mamões cv. Golden foram inoculados com

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Filho, Julio Alves Cardoso. "Efeito de extratos de albedo de laranja (Citrus sinensis) e dos indutores de resistência ácido salicílico, acilbenzolar-s-metil e Saccharomyces cerevisiae no controle de Phyllosticta citricarpa (Teleomorfo: Guignardia citricarpa)." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/11/11138/tde-14082003-164429/.

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A mancha preta dos citros (MPC) é uma doença que limita a exportação de laranja brasileira para o Japão e países da Europa. Exceto para Citrus aurantium e seus híbridos, todas as outras variedades são susceptíveis ao patógeno. O fungo Guignardia citricarpa, descoberto por Kiely em 1948 em New South Wales na Austrália, é o estádio sexual do agente causal da MPC e a sua fase imperfeita é Phyllosticta citricarpa. Uma importante característica da MPC é seu longo período de latência. A infecção pode ser efetuada por ascósporos e picnidiósporos. A lesão nos frutos fica restrita ao flavedo (e

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Mano, Emy Tiyo. "Identificação de genes de Burkholderia sp. associados ao controle biológico de Pectobacterium carotovora." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/87/87131/tde-23032011-143651/.

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A bacteria Pectobacterium carotovora causa danos a diferentes hospedeiros por meio da produção de enzimas pectinolíticas que degradam o pectato de cálcio da lamela media próximo a parede celular, causando extravasamento do conteúdo celular, sintomas da podridão mole. Bactérias do gênero Burkholderia tem se mostrado capazes em controlar a podridão mole em orquídeas, no entanto, os aspectos moleculares envolvidos neste controle ainda não foram estudados. Neste trabalho, foram avaliados 602 transformantes quanto a sua habilidade em inibir os sintomas da podridão mole, onde foram observados 16 mut

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Behlau, Franklin. "Epidemiologia do cancro cítrico (Xanthomonas axonopodis pv. citri) em laranja 'Pêra' (Citrus sinensis) sob condições de controle químico e cultural." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/11/11135/tde-22082006-153211/.

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O cancro cítrico, causado pela bactéria Xanthomonas axonopodis pv. citri, é uma das doenças mais importantes da citricultura. O estudo do efeito de medidas alternativas de controle para o manejo desta doença assume grande importância tanto para áreas citrícolas onde a erradicação de plantas não é a principal medida de controle do cancro cítrico, como no Estado do Paraná, como para regiões onde a prática da erradicação vem sendo adotada como principal medida de controle da doença, como no Estado de São Paulo. Instalado em pomar citrícola do município de Ourizona, na região Noroeste do Estado do

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Rodrigues, Maria Beatriz Calderan. "Controle de Guignardia citricarpa, agente causal da Mancha Preta dos Citros." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/11/11137/tde-16052006-155602/.

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A citricultura é uma atividade rural extremamente importante no contexto sócio-econômico brasileiro. A laranja representa 49% de toda a produção brasileira de frutas. Entretanto, anualmente milhares de toneladas de frutos são perdidas devido à ação de fitopatógenos. A Mancha Preta dos Citros (MPC) tem sido responsável por grandes prejuízos em várias regiões produtoras de citros no mundo, sendo designada como barreira fitossanitária, principalmente no mercado Europeu. Para o consumo in natura, a aparência dos frutos é fator essencial, onde a MPC compromete a comercialização de frutas frescas. O

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Benitez, Maria Soledad. "Applied T-RFLP Analyses for the Identification and Characterization of Microbial Populations Associated With Damping-Off Incidence in a Transitional Organic Cropping System." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1218471106.

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Staffa, Pumla. "Anti-tick activities of extracts of Tulbaghia violacea (Alliaceae) cultivated in hydroponic media amended with entomopathogenic fungi (Hypocreales)." Thesis, Cape Peninsula University of Technology, 2018. http://hdl.handle.net/20.500.11838/2830.

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Thesis (MTech (Horticulture))--Cape Peninsula University of Technology, 2018.<br>Ticks and tick-borne diseases are important limiting factors to the attainment of sustainable animal and human health, affecting livelihood of resource poor farming communities in developing countries. Rhipicephalus appendiculatus and Amblyomma variegatum (Ixodidae) are among the most troubling tick species in Africa. While ticks can be controlled by applying chemical acaricides, these chemicals are quite expensive, especially, for small-scale famers in developing countries. Hence, the quest for alternative tick c

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Duval, Alice Maria Quezado. "Diversidade de Xanthomonas spp. associadas à mancha-bacteriana em tomateiro para processamento industrial no Brasil." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/11/11135/tde-07042003-150839/.

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A mancha-bacteriana, causada por bactérias do gênero Xanthomonas, é uma das doenças mais importantes da cultura do tomate (Lycopersicon esculentum Mill.) para processamento industrial no Brasil. A etiologia dessa doença é complexa e a ocorrência das espécies envolvidas nas epidemias em lavouras da cultura no país é notavelmente pouco conhecida. Os objetivos desta tese foram identificar as espécies/grupos genéticos e as raças presentes em campos comerciais nas macro-regioes produtoras do Brasil-Central e Nordeste, determinar a sensibilidade in vitro de isolados ao cobre e aos antibióticos est

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ALVES, Kézia Ferreira. "Controle alternativo da antracnose do pimentão com extratos vegetais." Universidade Federal Rural de Pernambuco, 2008. http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/6576.

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Submitted by (lucia.rodrigues@ufrpe.br) on 2017-03-14T16:00:03Z No. of bitstreams: 1 Kesia Ferreira Alves.pdf: 466143 bytes, checksum: 66630edcc98b43dfb320ee8189581aa0 (MD5)<br>Made available in DSpace on 2017-03-14T16:00:03Z (GMT). No. of bitstreams: 1 Kesia Ferreira Alves.pdf: 466143 bytes, checksum: 66630edcc98b43dfb320ee8189581aa0 (MD5) Previous issue date: 2008-02-28<br>Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq<br>Anthracnose is considered an important disease of bell pepper (Capsicum annuum L.) in the state of Pernambuco and in various parts of t

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