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Dissertations / Theses on the topic 'Phytopathogenic microorganisms Biological control'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 January 2023

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1

Kabir, Nasreen Zahan. "Selection of effective antagonists against Rhizoctonia solani (AG-3), the causal agent of Rhizoctonia disease of potato." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=27351.

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Rhizoctonia solani (AG-3), the causal agent of Rhizoctonia disease of potato, overwinters as sclerotia on potato tubers. To develop a biocontrol strategy based on the prevention of the sclerotial germination, an isolation of microorganisms colonizing sclerotia of infected potato tubers (cultivars Norland, Atlantic and Souris), was conducted. In vitro screening was used to select effective antagonistic fungi against Rhizoctonia solani. Fifty fungal isolates were selected in order to cover all identified genera and potato variety and examined for their ability to inhibit germination of sclerotia

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2

Alfaro, Lemus Ana Lilia. "Factors influencing the control of citrophilous mealybug Pseudococcus calceolarie (Maskell) by Coccophagus gurneyi Compere in the Riverland of South Australia." Title page, contents and abstract only, 2001. http://web4.library.adelaide.edu.au/theses/09IM/09iml562.pdf.

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Includes bibliographical references (leaves 102-114) The highly successful biological control of the citrophilous mealybug Pseudococcus calceolarie (Maskell) (CM) by the parasitic wasp Coccophagus gurneyi Compere in several countries led to the release of this parasitoid in the Riverland of South Australia as part of an integrated pest management program. However CM has not been successfully controlled in this region. The results of this study may help to explain the lack of effective biological control of CM in Riverland citrus.

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3

Mphahlele, Mogalatjane Patrick. "Honey bee dissemination of Bacillus subtilis to citrus flowers for control of Alternaria." Diss., University of Pretoria, 2003. http://hdl.handle.net/2263/24207.

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The initial phase in the development of a biological control strategy is screening of biological control agents. Secondary to this phase is the establishment of accurate, effective application techniques. However, successful control requires a thorough understanding of all factors affecting the relationship between host plant, pathogen and other microbes. The purpose of this study was to screen and identify potential bacterial antagonists against Alternaria, a fungal citrus pathogen, attachment of the antagonists to bees, and bee dissemination of the antagonist to citrus flowers. A total of 56

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4

Ghajar, Feridon Ghasem Khan. "Stimulatory and inhibitory effects of UVA and UVB radiation on some physiological and pathogenic characteristics of fungal biocontrol agents to enhance mycoherbistat effectiveness." View thesis, 2004. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20050722.084927/index.html.

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5

Gumede, Halalisani. "The development of a putative microbial product for use in crop production." Thesis, Rhodes University, 2008. http://eprints.ru.ac.za/1352/.

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6

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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7

Pretorius, Rudolph Johannes. "A plant health management system for aphididae on lettuce under variable shadehouse conditions in the central Free State, South Africa." Thesis, Bloemfontein : Central University of Technology, Free State, 2008. http://hdl.handle.net/11462/114.

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Thesis (M. Tech) --Central University of Technology, Free State, 2008<br>Aphids (Hemiptera: Aphididae) are amongst the most destructive insects in agricultural crop production systems. This reputation stems from their complex life cycles which are mostly linked to a parthenogenetic mode of reproduction, allowing them to reach immense population sizes within a short period of time. They are also notorious as important and efficient vectors of several plant viral diseases. Their short fecund life cycles allow them to be pests on crops with a short growth period, e.g. lettuce (Lactuca sativa L.).

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8

Helps, Joseph Christopher. "Cultivar mixtures and the control of plant pathogens." Thesis, University of Cambridge, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708199.

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9

Kay, Stuart James. "The biological control of sapstain of Pinus radiata with microorganisms." Thesis, University of Auckland, 1995. http://hdl.handle.net/2292/2474.

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A total of six hundred and sixteen fungal and two hundred and thirty two bacterial isolates were obtained either from the sapwood of Pinus radiata or from other sources, including UV mutagenesis. All isolates were screened on Pinus radiata wood chips for their survival and colonisation attributes. Of these isolates, two hundred and eighty two failed to grow or caused permanent deep seated discolourations or decay and were eliminated from the study. The remaining five hundred and sixty six isolates were assessed for their antagonistic ability against sapstain. In a dual screen on Pinus radiata

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10

Morin, Louise. "Development of the field bindweed bioherbicide, Phomopsis convolvulus : spore production and disease development." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59614.

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Phomopsis convolvulus Ormeno, a foliar pathogen of field bindweed, is a good candidate to be developed as a bioherbicide. Large numbers of infective propagules were produced in shake-flask liquid fermentation with modified Richard's (V-8) medium and in solid-substrate fermentation with pearl barley grains. In complex liquid media, pycnidium-like structures were observed. Most conidia stored at $-$70$ sp circ$C remained viable and virulent for at least six months.<br>In controlled environment studies, a minimum of 18 hr of dew was required for severe disease development on inoculated plants. Th

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11

Zhang, Wenming. "Biological control of Echinochloa species with pathogenic fungi." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=40293.

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Six pathogenic fungal species were isolated from naturally-infected Echinochloa species and evaluated as biological control agents for E. crus-galli, E. colona, and E. glabrescens in rice. Bipolaris sacchari, Curvularia geniculata, and Exserohilum monoceras were non-pathogenic to rice and caused high mortality of Echinochloa species. E. monoceras was selected for further study. Under regulated greenhouse conditions, an inoculum dose of 2.5 $ times$ 10$ sp7$ conidia/m$ sp2$ killed E. crus-galli and E. glabrescens seedlings while 5.0 $ times$ 10$ sp7$ conidia/m$ sp2$ caused 100% mortality of E.

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12

Chin, Alice. "Evaluation of Macrophoma sp. as a potential mycoherbicide for the control of Amaranthus retroflexus L. (redroot pigweed)." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=23876.

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Amaranthus retroflexus L. (redroot pigweed) is a major weed of many crops in North America including corn, soybean, and potato. It can be readily controlled by chemical and cultural methods. However, some populations of A. retroflexus have developed resistance against the application of triazine herbicides. Biololical control could be an alternative method to control this weed species. In 1990, a Macrophoma sp. causing foliar lesions was isolated from redroot pigweed and the potential of this plant pathogenic fungus as a mycoherbicide was evaluated. Large numbers of infective propagules were p

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13

Na, Lampang Acharaporn. "Study on interactions between Sclerotium rolfsii Sacc. and selected antagonists." Title page, table of contents and abstract only, 1994. http://web4.library.adelaide.edu.au/theses/09PH/09phn165.pdf.

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14

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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15

Vogelgsang, Susanne. "Pre-emergence efficacy of Phomopsis convolvulus Ormeno to control field bindweed (Convolvulus arvensis L.)." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape10/PQDD_0021/NQ44621.pdf.

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16

DiTommaso, Antonio. "Effect of the fungal pathogen, Colletotrichum coccodes (Wallr.) Hughes, on growth, reproduction and competitive ability of velvetleaf (Abutilon theophrasti Medik.)." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=29012.

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Field and growth bench experiments were performed to assess the effect of a selective fungal pathogen of Abutilon theophrasti (velvetleaf) on various aspects of intra- and interspecific competition between this vigorous agricultural weed and soybean (Glycine max). In the absence of the foliar pathogen, Colletotrichum coccodes, A. theophrasti and soybean responded differently to the presence of conspecies or to individuals of the other species. In pure stand, the deleterious effects of intraspecific competition on reproductive output were substantially greater for A. theophrasti than for soybea

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17

Saad, Fadia. "Formulation of Colletotrichum coccodes as a bioherbicide." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41025.

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Colletotrichum coccodes (Wallr.) Hughes, a foliar pathogen of velvetleaf, is being developed as a bioherbicide. Formulation of living organisms for use as pest control products presents unique problems. This research has achieved the development of an adequate formulation of the pathogen by using kaolin clay or talcum powder (1:2.79 wt/wt) as the fillers to dry conidia. Formulated C. coccodes conidia stored at 4, 30C, or at room temperature in bags permeable to oxygen remained viable and able to infect velvetleaf plants at least six months in storage. Various reported germination stimulants in

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18

Ahn, Byeongseok. "Enhancing biocontrol activity of Colletotrichum coccodes." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=82816.

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Resistance responses of Abutilon theophrasti were investigated to determine defense mechanisms of the weed against Colletotrichum coccodes and to verify if some chemical suppression of the resistance mechanism could be exploited to enhance the virulence. Induced resistance in A. theophrasti has been confirmed in treatments with C. coccodes, benzothiadiazole, bentazon, and acifluorfen. Induction of peroxidase and phenylalanine ammonia lyase (PAL) activities in the leaves that did not contact with the inducing agents was observed after the localized stresses to the first leaf or the root

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19

Pohanka, Anton. "Antifungal antibiotics from potential biocontrol microorganisms /." Uppsala : Department of Chemistry, Swedish University of Agricultural Sciences, 2006. http://epsilon.slu.se/200647.pdf.

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20

Wood, A. R. (Alan Robert). "The biology of Endophyllum osteospermi, and its use for the biological control of Chrysanthemoides monilifera ssp. monilifera." Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/50119.

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Dissertation (PhD Agric)--University of Stellenbosch, 2004.<br>ENGLISH ABSTRACT: Chrysanthemoides monilifera ssp. monilifera is a shrub indigenous to South Africa, which has become a serious weed of native vegetation in Australia. Endophyllum osteospermi is a microcyclic, autoecious, rust fungus that induces witches' brooms on C. monilifera ssp. monilifera. This rust is considered as a candidate biocontrol agent for use against C. monilifera ssp. monilifera in Australia. The vegetative growth and reproductive output of healthy branches on bushes with different levels of E. osteospermi i

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Almada, Amalia Aruda. "Interactions between calanoid copepod hosts and their associated microbiota." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/97374.

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Thesis: Ph. D., Joint Program in Biological Oceanography (Massachusetts Institute of Technology, Department of Biology; and the Woods Hole Oceanographic Institution), 2015.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references.<br>Zooplankton, such as copepods, are highly abundant environmental reservoirs of many bacterial pathogens. Although copepods are known to support diverse and productive bacterial communities, little is understood about whether copepods are affected by bacterial attachment and whether they can regulate these associations through mechanisms such

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22

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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23

Ghajar, Feridon Ghasem Khan, University of Western Sydney, of Science Technology and Environment College, and of Science Food and Horticulture School. "Stimulatory and inhibitory effects of UVA and UVB radiation on some physiological and pathogenic characteristics of fungal biocontrol agents to enhance mycoherbistat effectiveness." THESIS_CSTE_SFH_Ghajar_F.xml, 2004. http://handle.uws.edu.au:8081/1959.7/621.

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Many candidate mycoherbicides have shown promise in the laboratory or greenhouse, but most have been ineffective in the field. Factors limiting mycoherbicide efficiency include temperature and humidity. Results from this thesis indicate that solar radiation has both a damaging effect(reduction in germination)limiting efficacy and a photomorphogenic effect(appressorium induction)increasing efficacy. The study has also shown significant interaction between temperature and solar radiation on the survival of conidia of potential mycoherbistats. Therefore, solar radiation should be considered as th

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Daranas, Boadella Núria. "Biological control of quarantine bacterial plant diseases with Lactobacillus plantarum strains. Improvement of fitness and monitoring." Doctoral thesis, Universitat de Girona, 2018. http://hdl.handle.net/10803/666181.

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The fruit production is threatened by several bacterial diseases, such as fire blight of apple and pear, bacterial canker of kiwifruit, bacterial spot of stone fruits, and angular leaf spot of strawberry. The conventional pesticides that are available for the control of these diseases are mainly copper compounds and they have a limited efficacy and negative impact on environment. Therefore, there is a need to develop alternative and sustainable management tools. This Ph.D. Thesis contributes to the development of a novel microbial biopesticide based on lactic acid bacteria. Two Lactobacillus p

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Gonzaga, Adriana Dantas. "Antagonismo de bactérias endofíticas de plantas da Amazônia contra o jardim de fungos associados às formigas cortadeiras Atta sexdens Hymenoptera (Formidae: Attini)." Universidade Federal do Amazonas, 2012. http://tede.ufam.edu.br/handle/tede/3118.

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Made available in DSpace on 2015-04-20T12:31:45Z (GMT). No. of bitstreams: 1 Adriana.pdf: 2128343 bytes, checksum: a126c0f543395afa8dcd9b4112191c0f (MD5) Previous issue date: 2012-02-29<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>Among the species of known insects (approximately 900 thousands), at about 2% is considered eusocial, because they live in truly advanced societies. The leaf-cutting ants belong to eusocial insects group and reached the major level of the instinct through the cultivation of fungi. Nowadays, they seems to be the unique animal group that have

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Maboeta, Mark Steve. "Ecological relevance of suborganismal and population responses of terrestrial oligochaeta to the fungicide copper oxychloride." Thesis, Stellenbosch : Stellenbosch University, 2000. http://hdl.handle.net/10019.1/51734.

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Thesis (Ph.D)--Stellenbosch University, 2000.<br>ENGLISH ABSTRACT: Copper oxychloride is a fungicide that is extensively used in vineyards in the Western Cape to treat and prevent fungal diseases. It is however not clear what the effects are on soil organisms, which play an important role in soil fertility, in South African soils. There is paucity of data linking results obtained in the laboratory to effects observed in the field, which will only become useful if a clear relation can be demonstrated. The aims of this study were to: ~ Determine the effects of copper oxychloride on field p

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Luong, Huu Thanh, Kieu Bang Tam Nguyen, Thuy Nga Vu, Thi Thuy Ha, Hai Van Tong, Thi Son Hua, Ngoc Quynh Nguyen, and Thi Hang Nga Nguyen. "Study on the possibility of using microorganisms as biological agents to control fungal pathogens Neoscytalidium dimidiatum causing disease of brown spots on the dragon fruit." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-227876.

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Research and application of microbial control of brown spot disease on the dragon fruit caused by fungi Neoscytalidium dimetiatum have important implications towards the safe and sustainable dragon fruit production. In this article, the research team has identified two strains of microorganisms capable of inhibiting fungi Neoscytalidium dimitiatum denoted A3, B7. Classification results determined that A3 belongs to Actinomyces group 3 with similarities of 100% (1500/1500 bp) with 16S rDNA segment of Streptomyces fradiae; B7 with similarities of 100% (1414/1414 bp) with 16S rDNA segment of bact

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Vasconcellos, Rafael Leandro de Figueiredo. "Actinobactérias da rizosfera de Araucaria angustifolia com potencial biotecnológico." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/11/11138/tde-18112008-150538/.

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A espécie Araucaria angustifolia, pertencente ao fragilizado Bioma Mata Atlântica, foi, durante décadas, uma das maiores fontes de madeira no Brasil. Essa espécie é de grande importância sendo fonte de alimento e matéria prima para a produção de móveis, polpa de celulose e vernizes. Devido à grande importância econômica e ambiental da araucária, estudos voltados à preservação e manejo da espécie se tornaram necessários. Este trabalho teve como finalidade isolar actinobactérias, presentes na rizosfera de araucária, antagônicos aos fungos Fusarium sp .e Armillaria sp. Estes patógenos são respons

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Eksteen, Aletta. "Ontwikkeling van molekulere merkers vir wilde-spesie-verhaalde weerstandsgeenkomplekse van gewone koring." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/2087.

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Thesis (MSc (Genetics))--University of Stellenbosch, 2009.<br>Worldwide, the rust diseases cause significant annual wheat yield losses (Wallwork 1992; Chrispeels & Sadava 1994). The utilization of host plant resistance to reduce such losses is of great importance particularly because biological control avoids the negative environmental impact of agricultural chemicals (Dedryver et al. 1996). The wild relatives of wheat are a ready source of genes for resistance to disease and insect pests. A large degree of gene synteny still exists among wheat and its wild relatives (Newbury & Paterson 2003).

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Silva, Maria Carolina dos Santos e. "Bioprospecção e caracterização de microrganismos endofíticos de isolados de sementes de guaranazeiro e o controle da antracnose (Colletotrichum spp.)." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/64/64133/tde-05052015-095919/.

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A cultura do guaranazeiro, (Paullinia cupana var. sorbilis) espécie nativa da região amazônica, é de grande importância para o Brasil, tanto do ponto de vista econômico quanto social. Atualmente, a comercialização do guaraná em rama (sementes torradas) é a maneira mais comumente utilizada na produção de xaropes e extratos de guaraná utilizados principalmente pelas indústrias de bebidas. O Brasil é o único produtor de guaraná no mundo, com destaque para o Estado do Amazonas e a Bahia. Entretanto, a produção de guaraná na região amazônica, centro de origem da planta, vem sendo cada vez mais afet

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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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Fialho, Mauricio Batista. "Efeito in vitro de Saccharomyces cerevisiae sobre Guignardia citricarpa, agente causal da pinta preta dos citros." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/11/11138/tde-25042005-154547/.

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Devido à percepção dos consumidores sobre o impacto da utilização de pesticidas sobre o ambiente e saúde humana, além da aquisição de resistência por parte dos fitopatógenos, a sociedade tem exercido pressões que levaram ao estabelecimento de políticas governamentais que restringem a utilização de fungicidas levando agricultores e pesquisadores a considerar a aplicação de técnicas de controle biológico de fitopatógenos fúngicos. Guignardia citricarpa é o agente causal da pinta preta dos citros, que é de grande importância econômica, pois interfere na produção e causa depreciação estética dos f

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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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Thaning, Christian. "Ways of managing Sclerotinia sclerotiorum inoculum /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv), 2000. http://epsilon.slu.se/avh/2000/91-576-5790-4.pdf.

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Mila, Grahovac. "Biološko suzbijanje Colletotrichum spp. parazitauskladištenih plodova jabuke." Phd thesis, Univerzitet u Novom Sadu, Poljoprivredni fakultet u Novom Sadu, 2014. https://www.cris.uns.ac.rs/record.jsf?recordId=85566&source=NDLTD&language=en.

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Colletotrichum spp. su značajni prouzrokovači bolesti biljaka u svetu i u na&scaron;oj zemlji, u polju i u skladi&scaron;tu. Na plodovima jabuke prisutne su dve vrste ovog roda, C. acutatum i C. gloeosporioides. Pomenute vrste uzrokuju ekonomski značajne gubitke posle berbe plodova jabuke, tokom skladi&scaron;tenja, transporta i plasmana na trži&scaron;te. Nedoumice sa kojima se naučna javnost suočava kada je u pitanju ovaj rod jeste precizno utvrđivanje sistematske pozicije i definisanje vrsta i nižih kategorija. Klasične fitopatolo&scaron;ke metode ne omogućavaju preciznuividentifikaciju do

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Favaro, Léia Cecília de Lima. "Diversidade e interação de Epicoccum spp. com cana-de-açúcar (Saccharum officinarum, L.)." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/11/11137/tde-09092009-143442/.

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O estudo de fungos endofíticos tem sido intensificado nos últimos anos e abrange principalmente a descrição de novas espécies, o potencial de utilização no controle biológico de fitopatógenos e a produção de metabólitos secundários com atividades biológicas diversas. No entanto, a interação e a possível função destes organismos em plantas de clima tropical são pobremente estudadas e pouco compreendidas. A cana-de-açúcar é uma das principais culturas do Brasil e nos últimos anos está recebendo especial atenção devido à produção de etanol para uso como biocombustível. Um grande avanço no conheci

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Melo, Flávia Mandolesi Pereira de. "Atividade antifúngica de metabólitos secundários produzidos pelo endófito de mandioca Bacillus pumilus MAIIIM4a." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/11/11138/tde-18072005-152305/.

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Microrganismos endofíticos são definidos como organismos que habitam em pelo menos durante um período de seu ciclo vital, o interior de um vegetal, sem causar aparentemente nenhum dano a este. Na busca de novos organismos e novos metabólitos secundários, um estudo foi conduzido visando avaliar a diversidade química de bactérias endofíticas por meio do isolamento e identificação de metabólitos secundários produzido por bactérias endofíticas de etnovariedades de mandioca, mantidas por tribos indígenas da Amazônia brasileira. Sessenta e sete bactérias endofíticas de mandioca foram selecionadas e

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Iraqi, Housseini Abdel Ilah. "Recherches sur la lutte biologique contre fomes lignosus (K1. ) Bres. , parasite de l'hevea, par utilisation de champignons antagonistes." Nancy 1, 1987. http://www.theses.fr/1987NAN10087.

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Fomes lignosus est un champignon parasite des racines de l'hevea (hevea brasiliensis). Dans le cadre de la lutte biologique contre ce pathogène, trois champignons antagonistes ont été étudiés : lentinus squarrosulus, cerrena meyenii et gloeophyllum striatum. Les caractères culturaux et les conditions optimales de développement des quatre champignons ont été étudiés

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Fialho, Mauricio Batista. "Mecanismos de ação de compostos orgânicos voláteis antimicrobianos produzidos por Saccharomyces cerevisiae sobre o desenvolvimento de Guignardia citricarpa, agente causal da pinta preta dos citros." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/11/11138/tde-12022009-085637/.

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A pinta preta dos citros tem como agente causal o fungo G. citricarpa. A doença causa depreciação estética dos frutos e praticamente inviabiliza a exportação de laranja in natura principalmente para a União Européia, por ser considerada uma doença quarentenária. Frutos colhidos contendo infecções quiescentes, embora sem sintomas, podem desenvolvê-los durante o processo de exportação. A utilização de fungicidas é o principal método de controle utilizado em pré e pós-colheita. No entanto, o custo do controle químico é significativamente alto e já foi relatado o surgimento de isolados resistentes

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Murray, Fiona Ruth. "Using glucose oxidase to control Verticillium wilt in cotton." Phd thesis, 1995. http://hdl.handle.net/1885/142749.

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Li, Dong-ping. "Interactions between Phytophthora cinnamomi, Pythium ultimum, Pseudomonas cepacia and seedlings." Phd thesis, 1990. http://hdl.handle.net/1885/143179.

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Abraham, Abraha Okbasillasie. "Integrated use of yeast, hot water and potassium silicate treatments for the control of postharvest green mould of citrus and litchi." Thesis, 2010. http://hdl.handle.net/10413/326.

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There is a growing recognition globally that many agrochemicals are hazardous to humans, animals and the environment. Therefore, there is a need to substitute these chemical products with biological and physical treatments, and to change agronomic practices in order to control pests and diseases in agriculture. The primary objective of this thesis was to develop and test in laboratory, field and commercial packhouses trials as alternative control measures against green mould of citrus (caused by Penicillium digitatum Pers: Fr. Sacc) and Penicillium molds of litchi (caused by several Penicilliu

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Moleleki, Ntsane. "RNA viruses of Sphaeropsis sapinea and Diaporthe ambigua and their possible use as biological control agents." Diss., 2002. http://hdl.handle.net/2263/29889.

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Sphaeropsis sapinea and Diaporthe ambigua are important pathogens of forest and orchard tree species, respectively. Some isolates of S. sapinea are co-infected with two dsRNA viruses, SsRVl and SsRV2. Isolates of D. perjuncta (formerly thought to be D. ambigua) are infected with a positive-stranded RNA virus known as DaRV. While S. sapinea is. infected with a heterogeneous mixture of dsRNA elements of different sizes, D. perjuncta is infected with a single virus. This presents excellent opportunity for biocontrol of Diaporthe. The aim of this study was to assess these three viruses for possibl

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Fernando, W. Gerard Dilantha. "Biology, epidemiology, and biological and chemical control of Phytophthora vignae." Thesis, 1990. http://hdl.handle.net/1957/37166.

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Phytophthora vignae, causal agent of stem and root rot of cowpea (Vigna unguiculata), was reported for the first time in Sri Lanka. The pathogen was found in cowpea field soils from 3 of 5 geographic regions sampled. Only one site however, had plants exhibiting disease symptoms. Of the eight cowpea varieties grown in Sri Lanka, four were shown to be relatively resistant; all other legumes inoculated were completely resistant. Two morphologic and physiologic races of P. vignae were identified among the 24 isolates recovered, based on differential pathogenicity on cowpea varieties. Bacteria isol

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Neumann, Brendon John. "The effects of Trichoderma (Eco-T) on biotic and abiotic interactions in hydroponic systems." Thesis, 2003. http://hdl.handle.net/10413/5507.

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The following body of research provides a detailed overview of the interactive effects of biocontrol agents and environmental factors and how these influence both the host plant and pathogen populations within hydroponic systems. Pythium and other zoosporic fungi are pathogens well suited to the aquatic environment of hydroponics. Motile zoospores facilitate rapid dispersal through fertigation water, resulting in Pythium becoming a yield reducing factor in most hydroponic systems and on most crops. With increasing trends away from pesticide use, biocontrol is becoming an ever more popular opti

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Hussain, Shaukat. "Effect of soil water pressures on population dynamics of Fusarium equiseti, Glocladium virens, Talaromyces flavus and Trichoderma viride, biocontrol agents of Verticillium dahliae in potatoes." Thesis, 1994. http://hdl.handle.net/1957/35756.

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Gomes, Teresa Maria da Cruz. "Role of olive tree phyllosphere microorganisms in the biological control of olive leaf spot and olive knot." Doctoral thesis, 2018. http://hdl.handle.net/1822/59025.

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Tese de Doutoramento em Ciências (Especialidade em Biologia)<br>The olive leaf spot (OLS) and the olive knot (OK) diseases are key constraints to olive production, due to their high incidence and related losses. However, none of the available control measures are effective against both diseases. This work aims to characterize the phyllosphere fungal communities, which reside in and on leaf/twig tissues of olive tree, and to understand their role in conferring host protection against these two diseases. Fungal communities of cultivars displaying differences on disease susceptibility were a

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Bartlett, Monika Eckstein. "Isolation and assessment of soilborne microorganisms as biological control agents of take-all disease (Gaeumannomyces graminis var. tritici)." 1994. http://hdl.handle.net/1993/17834.

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ŠMÍD, Jindřich. "Stanovení suprese vybraných původců onemocnění rostlin pomocí mykoparazitických hub." Master's thesis, 2011. http://www.nusl.cz/ntk/nusl-48112.

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STREJČKOVÁ, Monika. "Indukce supresivity půdy pomocí introdukce mykoparazitických hub proti významným původcům onemocnění rostlin." Master's thesis, 2013. http://www.nusl.cz/ntk/nusl-154547.

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This M. Sc. thesis is based on using of mycoparasitic fungi Trichoderma virens, Clonostachys rosea f. catenulata in biological control against phytopathogenic fungi Sclerotinia sclerotiorum, Rhizoctonia solani, Botrytis cinerea and Fusarium solani. The efficacy of mycoparasitic fungi against pathogens was evaluated in dual cultural tests. The strains of T. virens and C. rosea f. catenulata isolated from soils in the Czech Republic were tested in the experiment. Reference strain was GL 21 fungus T. virens reisolated from commercially available bio-preparation SoilGard and strain C. rosea f. cat

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