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Viral suppression of host defensesMahadevan, Geetha B. January 2004 (has links)
Thesis (M.S.)--Worcester Polytechnic Institute. / Keywords: plant pathogen interactions; turnip crinkle virus. Includes bibliographical references (p. 59-61).
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Pectolytic enzymes in relation to parasitism of certain soft rotting bacterial and fungus plant pathogensEchandi, Eddie, January 1955 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1955. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 47-49).
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Characterization of Agrobacterium tumefaciens adsorption to potato tissueKluepfel, Daniel Albert, January 1984 (has links)
Thesis (Ph. D.)--University of Florida, 1984. / Description based on print version record. Typescript. Vita. Includes bibliographical references (leaves 120-133).
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A fine structure study of the host-parasite interactions of three fungal diseasesCamp, Russell Rufus, January 1970 (has links)
Thesis (Ph. D.)--University of Wisconsin, 1971. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliography.
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Cephalosporium elm wilt in MassachusettsJohnson, Eunice Moore 01 January 1937 (has links) (PDF)
No description available.
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Microbial antagonists of Bipolaris maydis and the factors affecting survival of plant pathogenic and nonpathogenic bacteria /Sleesman, John Paul January 1975 (has links)
No description available.
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The effect of amplitude and frequency of temperature fluctuations on growth of Sclerotium bataticola and Verticillium dahliae and on disease development in their host plants.Wilanowski-Guzdziol, Barbara. January 1974 (has links)
No description available.
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Introduction pathways of phytopathogenic fungi and their potential role in limiting plant invasions: the case of Banksia spp. (Proteaceae) in the Cape Floristic RegionQongqo, Axola January 2018 (has links)
Thesis (Master of Conservation Science)--Cape Peninsula University of Technology, 2018. / Introduction pathways of fungal pathogens in South Africa are far less quantified in the literature than those for plants, animals and human infectious diseases. Phytopathogens continue to be introduced to South Africa via several pathways at an unprecedented rate. A number of these species pose a significant threat to South African ecosystems and biodiversity. Despite this, fungal pathogens could also be beneficial when they are used as bio-control agents to control alien invasive plant species. Nevertheless, recent studies revealed pathogens are most likely to be studied after they have caused a detrimental impact on the environment. Invasive fungal pathogens, such as Phytophthora cinnamomi (Oomycota) do not only pose a threat to native species of the family Proteaceae but could also potentially be bio-control agents for emerging alien plant invaders. In this thesis, firstly, I review current knowledge of phytopathogenic fungi introduction pathways in South Africa; secondly, I aim to understand the importance of fungi in limiting plant invasions using Banksia as a case study in the Cape Floristic Region. In chapter two I investigate introduction pathways and dispersal vectors that facilitate the spread of fungal pathogens. I compiled comprehensive list of fungal pathogens in South Africa, and evaluated the dispersal vectors and introduction pathways for each species. I found fifty five casual species, three naturalised species, six invasive species and thirty six pathogens for which invasion status was not classified due to insufficient data. Agriculture is responsible for the introduction of most fungal pathogens in South Africa. Wind was identified to be the prominent dispersal vector facilitating the spread of pathogens. I conclude that knowing introduction pathways of pathogens and their dispersal vectors will assist in developing quarantine protocols that could improve bio-security. Lastly, I provide recommendations for the national invasive microbe species list. In chapter three the study investigates the variability in mortality rate of Banksia species in the Cape Floristic. Species abundance was calculated across known Banksia populations in the Cape Floristic Region to determine survival and mortality rates. Soil and leave samples were taken from Banksia plants to evaluate potential microbial pests that were present. Also, acetone leaf extracts of twelve Banksia species were screened for antimicrobial activity against P. cinnamomi (Oomycota). Lastly, a post-border risk assessment was conducted for 14 Banksia species− present in South Africa − using the Australian Weed Risk Assessment protocol, to evaluate potentially invasive species. The results indicated that survival and mortality rate varied across species; I found the two invasive species, B. integrifolia and B. ericifolia to have the highest survival rate. Phytophthora cinnamomi was the most prominent isolated fungal pathogen sampled from Banksia species roots. The detection of antifungal activities in the minimum inhibitory concentration (MIC) bioassay provided evidence that some Banksia species (B. ericifolia, B. integrifolia, B. hookeriana and B. formosa) have antimicrobial chemical constituents that could possibly inhibit infection and colonisation by P. cinnamomi. The weed risk assessments conducted on Banksia species showed five species pose a high risk of invasion while seven species required further evaluation. I conclude that P. cinnamomi could potentially regulate invasive Banksia species such as B. speciosa with minimal antimicrobial activity against the pathogen. I recommend an in-situ and ex-situ inoculation trials of Banksia species against P. cinnamomi to be conducted to evaluate pathogenicity, under different watering regimes since the pathogens proliferation is favoured by soils that are high in moisture. I present the main conclusions from this thesis in chapter four and provide recommendations for management and invasive species legislation.
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Phytophthora megasperma var. sojae race 4 : varietal reactions and inheritance of resistanceSim, Thomas January 2011 (has links)
Digitized by Kansas Correctional Industries
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Possible cytoplasmic inheritance and its effect on the phenotypic variability in Phytophthora megasperma var. sojaeTrombold, David George January 2011 (has links)
Typescript. / Digitized by Kansas Correctional Industries
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