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Dissertations / Theses on the topic 'Soilborne plant diseases'

Author: Grafiati

Published: 4 June 2021

Last updated: 31 July 2024

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1

Odom, Jennifer Lorraine. "Evaluation of Field Pea Varieties for Resistance to Fusarium Root Rot Pathogens." Thesis, North Dakota State University, 2017. https://hdl.handle.net/10365/28500.

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Fusarium root rot is one of the most important diseases of pulse crops, with numerous Fusarium spp. comprising the disease complex. Fusarium solani and F. avenaceum have been reported to be major pathogens in the pea root rot complex, and all commonly grown varieties are susceptible. Greenhouse methods to evaluate peas for resistance to Fusarium root rot resulted in inconsistent disease severity across varieties. In 2015, F. avenaceum infested field plots were more heavily damaged based on emergence and yield than F. solani infested plots, and opposite trends were observed in 2016. Differences

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2

Lloyd, Margaret Gullette. "Strawberry Production and Management of Soilborne Diseases in the Post-Fumigation Era." Thesis, University of California, Davis, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3723667.

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<p> California grows more than 91% of fresh strawberries in the United States. Critical to this success has been management of soilborne diseases using pre-plant soil fumigation with methyl bromide. However, international regulations require a phase out of methyl bromide, soon to be completed. Reduced availability of methyl bromide has coincided with increased incidence of soilborne diseases affecting strawberry production, including Verticillium wilt, caused by <i> Verticillium dahliae</i>, and Black Root Rot (BRR). BRR is caused by a complex of soilborne pathogens, including <i>Pythium ultim

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3

Lynch, Ryan P. "Controlling Soilborne Diseases of Potato and Influencing Soil Microbiology with Brassica Cover Crops." Fogler Library, University of Maine, 2008. http://www.library.umaine.edu/theses/pdf/LynchRP2008.pdf.

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4

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

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

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5

Cummings, Jaime Anne. "Evaluation of seed and drench treatments for management of damping-off and seedling blight pathogens of spinach for organic production." Online access for everyone, 2007. http://www.dissertations.wsu.edu/Thesis/Fall2007/j_cummings_112007.pdf.

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6

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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7

Tewoldemedhin, Yared Tesfai. "Characterisation of Rhizoctonia in cropping systems in the Western Cape Province." Thesis, Stellenbosch : University of Stellenbosch, 2005. http://hdl.handle.net/10019.1/2269.

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Thesis (MScAgric (Plant Pathology))--University of Stellenbosch, 2005.<br>The genus Rhizoctonia includes important soilborne plant pathogens that can cause severe economic losses on a wide range of crops including cereal, canola, pasture and grain legume crops. Limited information is available on specific anastomosis groups (AGs), nuclear status, pathogenicity and cross-pathogenicity of Rhizoctonia isolates associated with each of these crops in the Western Cape province. Therefore, these aspects were investigated in this study, since information in this regard is crucial for the developm

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8

Levenfors, Jens. "Soil-borne pathogens in intensive legume cropping - Aphanomyces spp. and root rots /." Uppsala : Dept. of Plant Pathology and Biocontrol Unit, Swedish Univ. of Agricultural Sciences, 2003. http://epsilon.slu.se/a393.pdf.

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9

Lainà, Rosetta. "Some effects of air-filled porosity on the suppression of damping-off of seedlings by pythium ultimatum in compost amended potting media /." [Campbelltown, N.S.W. : The author], 1997. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20030709.141536/index.html.

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10

Fang, Lynn. "Biological Indicators Of Compost-Mediated Disease Suppression Against The Soilborne Plant Pathogen Rhizoctonia Solani." ScholarWorks @ UVM, 2015. http://scholarworks.uvm.edu/graddis/456.

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Compost can suppress soilborne plant pathogens that cause significant damage on globally important food crops. However, reports of plant pathogen suppression are inconsistent likely because there are no established standards for feedstock material, application rate, and maturity age upon application. Excellent results can be achieved in greenhouse trials, but field applications are much less reliable. Disease suppression occurs through the activity of biocontrol organisms (direct antagonism), and general microbial competition. Biocontrol species are hypothesized to colonize the pile during the

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11

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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12

INOKUTI, Eliane Mayumi. "Comparação de iscas para quantificação da atividade saprofítica de Rhizoctonia ssp. no solo e relação com atividade patogênica." Universidade Federal Rural de Pernambuco, 2012. http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/6557.

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Submitted by (lucia.rodrigues@ufrpe.br) on 2017-03-10T14:20:09Z No. of bitstreams: 1 Eliane Mayumi Inokuti.pdf: 262975 bytes, checksum: 46e8a0576767e569d0817560c99aae40 (MD5)<br>Made available in DSpace on 2017-03-10T14:20:09Z (GMT). No. of bitstreams: 1 Eliane Mayumi Inokuti.pdf: 262975 bytes, checksum: 46e8a0576767e569d0817560c99aae40 (MD5) Previous issue date: 2012-07-30<br>The fungi Rhizoctonia spp. is an important soilborne plant pathogen. The objective of this study was to evaluate the effectiveness of baits to quantify the saprophytic activity of Rhizoctonia in soil and determine th

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13

Testen, Anna Louise. "Participatory Research to Improve Soil and Plant Health on Vegetable Farms in Tanzania and Ohio." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1491990803745543.

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14

Donahoo, Ryan S. "Soilborne with an aerial habitat characterization of Phytophthora species recovered from nursery and vegetable production in Tennessee /." 2008. http://etd.utk.edu/2008/DonahooRyan.pdf.

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15

Mabuka, Katlego Lesley. "Integrated management strategies for meloidogyne species in solanum lycopersicum production systems." Thesis, 2015. http://hdl.handle.net/10386/1398.

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Thesis (M.A. Agricultural Management (Plant Production)) -- University of Limpopo, 2015<br>Tomato (Solanum lycopersicum L.) production had been ranked as the most important commodity in terms of job and wealth creation within the auspices of the National Development Plan (NDP) framework in Limpopo Province. However, soil-borne diseases including plant-parasitic nematodes preclude the successful monoculturing of this commodity and therefore inducing instability in job creation. Generally, after growing a tomato crop for one season in commercial tomato-production systems, the land is being fallo

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16

Yobo, Kwasi Sackey. "Biological control and plant growth promotion by selected trichoderma and Bacillus species." Thesis, 2005. http://hdl.handle.net/10413/5335.

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Various Trichoderma and Bacillus spp. have been documented as being antagonistic to a wide range of soilborne plant pathogens, as well as being plant growth stimulants. Successes in biological control and plant growth promotion research has led to the development of various Trichoderma and Bacillus products, which are available commercially. This study was conducted to evaluate the effect of six Trichoderma spp. and three Bacillus spp. and their respective combinations, for the biological control of Rhizoctonia solani damping-off of cucumber and plant growth promotion of dry bean (Phaseolus vu

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17

Abraham, Abraha Okbasillasie. "Biological control of Phytophthora root rot of citrus seedlings and cuttings." Thesis, 2005. http://hdl.handle.net/10413/3830.

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With an increasing realization that many agrochemicals are hazardous to animals and humans, came the desire to replace these chemical agents with biological approaches that are more friendly to the environment and human health. Microorganisms play an important role in plant disease control, as naturally occurring antagonists. Microorganisms may also have beneficial effects on plant development when applied to plant roots. Research efforts worldwide have recorded successes in biological control and growth stimulation on many crops, particularly when using members of the genera Bacillus and Tri

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18

Kubheka, Bongani Petros. "In vitro and in vivo screening of Bacillus spp. for biological control of Rhizoctonia solani." Thesis, 2003. http://hdl.handle.net/10413/5501.

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The increasing concerns about chemical pesticides that are environmentally hazardous and the continuous development of resistance by palhogens to chemical pesticides have led to this study. Many studies have shown that some Gram-negative bacteria, such as Pseudomonas flouresens, control plant diseases and promote plant growth. In this study Gram positive bacteria, Bacillus sp., were chosen because of their ability to produce endospores. Endospores can be used in stable, dry formulations. The advantage of using endospores is their ability to survive harsh conditions such as droughts and high te

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19

Ross, Ian L. "Mechanisms of biocontrol of Gaeumannomyces graminis var. tritici by Pseudomonas corrugata strain 2140 : genetic and biochemical aspects / Ian Ross." Thesis, 1996. http://hdl.handle.net/2440/18760.

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Bibliography: leaves 207-220.<br>220 leaves : ill. ; 30 cm.<br>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 anti

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20

Ross, Ian L. "Mechanisms of biocontrol of Gaeumannomyces graminis var. tritici by Pseudomonas corrugata strain 2140 : genetic and biochemical aspects / Ian Ross." 1996. http://hdl.handle.net/2440/18760.

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Bibliography: leaves 207-220.<br>220 leaves : ill. ; 30 cm.<br>Title page, contents and abstract only. The complete thesis in print form is available from the University Library.<br>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 c

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21

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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22

Tesfagiorgis, Habtom Butsuamlak. "Studies on the biocontrol of seedling diseases caused by Rhizoctonia solani and Pythium sp. on sorghum and tef." Thesis, 2003. http://hdl.handle.net/10413/6254.

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Rhizoctonia solani and Pythium spp. are aggressive soil-borne fungal pathogens responsible for seed rot and seedling damping-off of many crops. With increased environmental and public concern over the use of chemicals, biological control of these diseases has been attracting more attention. However, success with this strategy depends on the development of effective antagonists, which requires repeated in vitro and in vivo tests. Bacillus spp. were isolated from a soil sample obtained from a field where sorghum and tef had been grown for at least two years. Potential Bacillus

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23

(12298370), Alison S. Jensen. "Redefining pachymetra root rot management strategies and cultivar resistance in commercial sugarcane fields." Thesis, 2020. https://figshare.com/articles/thesis/Redefining_pachymetra_root_rot_management_strategies_and_cultivar_resistance_in_commercial_sugarcane_fields/19426862.

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Pachymetra chaunorhiza is an important soilborne pathogen of sugarcane and is found only in Australia. Pachymetra root rot is managed primarily by growing resistant cultivars, which are chosen for planting based on oospore levels in the soil. This management strategy does not account for differences in virulence among Pachymetra populations, despite previous research demonstrating that two genetically distinct groups of Pachymetra occur, which may differ in pathogenicity. Higher than expected yield losses have been associated with high oospore levels under some cultivars with intermediate resi

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24

Msiska, Zola. "Arbuscular mycorrhizal fungi of Ugandan banana plantation soils." Diss., 2003. http://hdl.handle.net/2263/28719.

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