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Comparative epidemiology of Phytophthora diseases of Rhododendron

Creator:: Taylor, Clare Rebecca
Abstract:: Rhododendron species are host to many Phytophthora species and are an important crop in the nursery industry. The foliar epidemiology of twelve Phytophthora diseases on Rhododendron was studied in field and growth chamber experiments on two Rhododendron cultivars. The relative aggressiveness of Phytophthora spp. was assessed using disease incidence, severity,...
Resource Type:: Masters Thesis
Full Text:: : ________________________________________________________________ Niklaus J Grünwald Rhododendron species are host to many Phytophthora species and are

Fungal endophyte diversity in foliage of native and cultivated Rhododendron species determined by culturing, ITS sequencing, and pyrosequencing

Creator:: Raizen, Nathaniel L.
Abstract:: Western Oregon is home to native Rhododendron species and is the center for cultivated Rhododendron production in the United States. These Rhododendron spp. are known to be infected with fungal endophytes. However, the community structure of these endophytes in native and cultivated Rhododendron is poorly understood. Our study targeted the...
Resource Type:: Masters Thesis
Full Text:: approved: Niklaus J. Grünwald Western Oregon is home to native Rhododendron species and is

Addressing the relationship between Pseudoperonospora cubensis and P. humuli using phylogenetic analyses and host specificity assays

Creator:: Mitchell, Melanie N.
Abstract:: The two most economically important plant pathogens in the Pseudoperonospora (Peronosporaceae) genus are P. cubensis, causal agent of cucurbit downy mildew, and P. humuli, causal agent of hop downy mildew. These organisms have been shown to be very closely related phylogenetically and morphologically. In 2005, researchers in Korea proposed that...
Resource Type:: Masters Thesis
Full Text:: AN ABSTRACT OF THE THESIS OF Melanie N

Drivers of Soil Fungal Communities Across Three Tropical Rainforests in Panama

Creator:: Schappe, Tyler
Abstract:: Fungi play critical roles in ecosystem processes and interact with plant communities in mutualistic, pathogenic, and commensal ways. Fungal communities are thought to be influenced by both associated tree communities and soil properties. However, the relative importance of the biotic and abiotic drivers of soil fungal community structure and diversity...
Resource Type:: Masters Thesis
Full Text:: nitrogen (N), notably in both inorganic and organic forms (Anderson, Chambers & Cairney 1999

The extension of Gibbs' vector products to n-space

Creator:: Goman, Edward Gordon
Resource Type:: Masters Thesis
Full Text:: where n_2(A3XAk:Á5...A) = A1.A = O, (i = 1, 2; j = 3, ..., n). We will find it convenient to adopt

Epidemic Dynamics of Sudden Oak Death in the Forests of Oregon

Creator:: Carson, Adam
Abstract:: Sudden Oak Death (SOD) is a forest disease caused by the oomycete pathogen Phytophthora ramorum, and infects trees in the Western United States and Europe. This generalist pathogen can infect over 130 species of plants, and causes rapid mortality in tree species in the Fagaceae. Sexual reproduction is thought to...
Resource Type:: Masters Thesis
Full Text:: , S., Heungens, K., and Grünwald, N. J. 2011. Phytophthora ramorum in Canada: Evidence for migration

Phytophthora ramorum within an Oregon tanoak forest : quantifying inoculum within canopy throughfall vs. soil splash

Creator:: Benemann, Silvia, E.
Abstract:: Phytophthora ramorum continues to cause extensive mortality of tanoaks in southwestern Oregon. Rain readily washes inoculum down through the canopy, causing new infections on the lower parts of the tree and neighboring host plants. Although this aspect of dispersal is well understood, the relative importance of infested soil and leaf...
Resource Type:: Masters Thesis
Full Text:: . 86:441. Grünwald, N. J., Larsen, M. M., Kamvar, Z., Reeser, P. W., Kanaskie, A., Laine, J. 2016

An Exploration of the Ecological and Geographical Variability of Rhizopus microsporus Clinical and Environmental Isolates

Creator:: Stairs, Brandon S.
Abstract:: Rhizopus microsporus is a globally ubiquitous opportunistic human and plant pathogen that is known to harbor endosymbiotic bacteria. Differences between populations of clinical and environmental R. microsporus isolates have yet to be assessed on a global scale. Whole-genome sequence data were used to explore fungal biology and to assess potential...
Resource Type:: Masters Thesis
Full Text:: grateful. CONTRIBUTION OF AUTHORS Dr. Kevin Amses, Dr. Jessie Uehling, and Dr. Niklaus Grunwald

Differential Effects of First Year Wheat Genotype on the Suppression of Take-All Disease and the Establishment of Suppressive Microbial Agents in the Rhizosphere

Creator:: Perkins, Evan M.
Abstract:: Recent research in the UK has found that the wheat cultivar grown in the first year can have a significant impact on the amount of take-all that develops in the second year, regardless of the cultivar planted in year two. ‘Einstein’ is one such cultivar that reduces take-all disease (reduced...
Resource Type:: Masters Thesis
Full Text:: . Molecular plant-microbe interactions: MPMI 16: 851–858. Imperiali N, Dennert F, Schneider J, Laessle T

Specificity of quantitatively expressed host resistance to Mycosphaerella graminicola

Creator:: Krenz, Jennifer E.
Abstract:: The specificity of quantitative host resistance to plant disease has long been a controversial issue. We examined interactions between wheat (Triticum aestivum) and Mycosphaerella graminicola, causal agent of Septoria tritici blotch, to determine whether specific interactions occur between host and pathogen genotypes that could be involved in eroding quantitatively expressed...
Resource Type:: Masters Thesis
Full Text:: committee members, Dr. Nik Grunwald, Dr. Jim Peterson, and Dr. Christine Kelly. Many thanks to the

ScholarsArchive@OSU

Comparative epidemiology of Phytophthora diseases of Rhododendron

Fungal endophyte diversity in foliage of native and cultivated Rhododendron species determined by culturing, ITS sequencing, and pyrosequencing

Addressing the relationship between Pseudoperonospora cubensis and P. humuli using phylogenetic analyses and host specificity assays

Drivers of Soil Fungal Communities Across Three Tropical Rainforests in Panama

The extension of Gibbs' vector products to n-space

Epidemic Dynamics of Sudden Oak Death in the Forests of Oregon

Phytophthora ramorum within an Oregon tanoak forest : quantifying inoculum within canopy throughfall vs. soil splash

An Exploration of the Ecological and Geographical Variability of Rhizopus microsporus Clinical and Environmental Isolates

Differential Effects of First Year Wheat Genotype on the Suppression of Take-All Disease and the Establishment of Suppressive Microbial Agents in the Rhizosphere

Specificity of quantitatively expressed host resistance to Mycosphaerella graminicola

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