Index Catalog // ScholarsArchive@OSU

Host range, serological and electron microscope studies of phages of Agrobacterium tumefaciens (Smith and Townsend) Conn

Creator:: Buangsuwon, Pairoj
Abstract:: Phages of crown gall bacteria were among the first to be isolated and certain properties of these phages have been studied by a number of investigators. However, several important characteristics have not been studied in detail. The present investigation was made in order to determine the major sources of phages...
Resource Type:: Dissertation
Full Text:: Phages of Agrobacterium Tumefaciens (Smith and Townsend) Conn AN ABSTRACT OF THE THESIS OF PAIROJ

Transmission of plant pathogenic bacteria and a bacteriophage of Agrobacterium tumefaciens (Smith and Townsend) Conn by a saprozoic nematode, Diplogaster lheriteiri Maupas

Creator:: Chantanao, Aroon
Abstract:: A saprozoic nematode, Diplogaster lheriteiri Maupas 1919, was studied to determine its relationship to the plant pathogenic bacteria, Agrobacterium tumefaciens (Smith and Townsend) Conn., Erwinia amylovora (Burrill) Winslow et al., Erwinia carotovora (Jones) Holland, Pseudomonas phaseolicola (Burk. ) Dows., Xanthomonas campestris (Pam. ) Dows. and to a phage of A....
Resource Type:: Dissertation
Full Text:: bacteriophage of Agrobacterium tumefaciens (Smith and Townsend) conn by a saprozoic nematode, Diplogaster

Identification of MIR390a precursor processing defective mutants in Arabidopsis by direct genome sequencing

Creator:: Cuperus, Josh T., Montgomery, Taiowa A., Fahlgren, Noah, Burke, Russell T., Townsend, Tiffany, Sullivan, Christopher M., and Carrington, James C.
Abstract:: Transacting siRNA (tasiRNA) biogenesis in Arabidopsis is initiated by microRNA (miRNA) –guided cleavage of primary transcripts. In the case of TAS3 tasiRNA formation, ARGONAUTE7 (AGO7)– miR390 complexes interact with primary transcripts at two sites, resulting in recruitment of RNA-DEPENDENT RNA POLYMERASE6 for dsRNA biosynthesis. An extensive screen for Arabidopsis mutants...
Resource Type:: Article
Full Text:: . Montgomerya,b, Noah Fahlgrena,b, Russell T. Burkeb, Tiffany Townsendb, Christopher M. Sullivanb,c, and James C

Studies of yellow rust of Rubus

Creator:: Lund, Walter Thomas
Resource Type:: Masters Thesis
Full Text:: appreciation to Doctor S. M. Zeller for his suggestions and willing assistance during the inves- tigation

Studies of the crinkle disease of strawberry, with special reference to its transmission

Creator:: Vaughan, Edward Kemp
Resource Type:: Masters Thesis
Full Text:: - gations and preparing the thesis; to Dr. George M. Darrow, Senior Poinologist, ti. S. Departhent of Agri

The sequestrate relatives of Russula in Australia and New Zealand

Creator:: Lebel, Teresa
Resource Type:: Dissertation
Full Text:: ), and later S. M. Zeller (1885-1948), H. Gilkey (1886-1972), C. W. Dodge (1895-1988), A. H. Smith

Susceptibility of Pacific yew (Taxus brevifolia Nutt.) to Phytophthora lateralis

Creator:: Murray, Marion S.
Abstract:: In 1991 Pacific yew (Taxus brevifolia Nutt.) was reported as a new host for Phytophthora lateralis Tucker and Milbrath which is an aggressive root rot pathogen thought previously to be specific to Port-Orford-cedar. This study was designed to compare the pathogenicity of P. lateralis on the two hosts, and to...
Resource Type:: Masters Thesis
Full Text:: Phytophthora lateralis AN ABSTRACT OF THE THESIS OF Marion S. Murray for the degree of Master of Science

Oregon mushrooms

Creator:: Gilkey, Helen M., 1886-1972
Resource Type:: Masters Thesis
Full Text:: b a S 5 S r . 4 . 1 1 1 S * : : « M - : I ' -29- Boletus

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:: vitro. Mycological Research. 108:823–827. Brasier, C. M., Denman, S., Rose, J., Kirk, S. A., Hughes

Castilleja and Pedicularis are confirmed as telial hosts for white pine blister rust in whitebark pine ecosystems of Oregon and Washington

Creator:: Mulvey, Robin L.
Abstract:: The primary objective of this research was to determine if native species within the genera Castilleja and Pedicularis are naturally infected by white pine blister rust (Cronartium ribicola) in whitebark pine ecosystems of the Oregon and Washington Cascade Range. Secondary objectives were to monitor the phenology of aecial and telial...
Resource Type:: Masters Thesis
Full Text:: Whitebark Pine Ecosystems of Oregon and Washington. Abstract approved: Everett M. Hansen The

West Eugene Native Wetland Restoration Research Project: Seed Dormancy, Germination, and Establishment

Creator:: Wilson, Mark V., Ingersoll, Cheryl A., and Clark, Deborah Louise, 1950-
Abstract:: Seed size, abundance, viability, dormancy, and germination requirements strongly influence plant establishment and therefore are important considerations in restoration of native vegetation. These characteristics provide criteria for selection of suitable species, development of collection and pretreatment methods, and determination of seeding densities. The first set of objectives of this study...
Resource Type:: Technical Report
Full Text:: T ab le 3. D or m an cy an d ge rm in at io n co nd it io ns of co ll ec te d se ed s

Recommendations for Control of Tall Oatgrass, Poison Oak, and Rose in Willamette Valley Upland Prairies

Creator:: Wilson, Mark V. and Clark, Deborah Louise, 1950-
Abstract:: Native upland prairies, which once dominated the landscape of the Willamette Valley, are considered among the rarest of Oregon's ecosystems. Even though only remnants remain today, they harbor many rare and endangered species such as the Fender's blue butterfly and its host plant, Kincaid’s lupine. Invasion of remnant prairies by...
Resource Type:: Technical Report
Full Text:: , J. M., and S. T. A. Pickett. 1991. Plant litter: its dynamics and effects on plant community

Final report 1994-1996 : Effects of fire and fire fighting techniques on Fender's blue butterfly and Kincaid's lupine

Creator:: Clark, Deborah Louise, 1950- and Wilson, Mark V.
Abstract:: We report results from a field experiment evaluating the effectiveness of mowing, mowing and herbicides, and burning on woody plants, key native and non-native grasses and forbs, and the Fender's blue butterfly. The goal was to find a technique that controlled woody pest plants without harming native species or promoting...
Resource Type:: Technical Report
Full Text:: . Wilson Submitted to Western Oregon Refuges U. S. Fish and Wildlife Service Order No. 10181-4-1843(PM

Synthesis and assembly of Fucus zygote cell walls with an emphasis on alignate and fucans

Creator:: Doubet, Scott
Abstract:: Fucus distichus L. Powell zygotes were used to investigate cell wall synthesis and development and to construct a model of cell wall structure. Alginate synthesis was investigated. Zygotes were cultured in seawater containing ¹⁴C-bicarbonate. Alginate represented 12%, 37%, and 1.7% of the label recovered from whole zygotes, wall, and cytoplasm,...
Resource Type:: Dissertation
Full Text:: blocks. The ratio of label in alginate monomers (M/G) was 0.8 (cytoplasm) and 0.5 (wall), suggesting

Diagnosis and Etiology of a Soilborne Disease Complex of Winter Squash (Cucurbita maxima) in the Willamette Valley, OR

Creator:: Rivedal, Hannah M.
Abstract:: Winter squash (Cucurbita maxima) grown in Oregon’s Willamette Valley for edible seed, frozen foods, and fresh markets is susceptible to an undiagnosed soilborne disease. Diseased squash fields exhibit symptoms of stunting, root and crown rot, vascular discoloration, and late-season wilt, which in extreme cases can lead to total crop failure....
Resource Type:: Dissertation
Full Text:: THE DISSERTATION OF Hannah M. Rivedal for the degree of Doctor of Philosophy in Botany and Plant

Stand structures of Oregon white oak (Quercus garryana) woodlands and their relationships to the environment in southwestern Oregon

Creator:: Gilligan, Laurie A.
Abstract:: Large areas of non-coniferous communities in southwestern Oregon are thinned to reduce fire hazard and accomplish ecosystem restoration, under the assumption that current fuel loads are unnaturally high. Although Oregon white oak (Quercus garryana) woodlands are a characteristic landscape component in this region, little is known about their current or...
Resource Type:: Masters Thesis
Full Text:: : _____________________________________________________________________ Patricia S. Muir Large areas of non-coniferous communities in southwestern Oregon are

The effects of abscisic acid on gene expression during wheat germination

Creator:: Ballo, Barbara
Abstract:: Germination of immature (Stage III) and mature (Stage V) wheat (Triticum aestivum L. var. Chinese Spring and Yamhill) embryos is prevented by the inclusion of 10⁻⁴ M abscisic acid (ABA) in culture medium. In addition, Stage III embryos develop into mature embryos in culture medium containing ABA. In the absence...
Resource Type:: Dissertation
Full Text:: Gene Expression During Wheat Germination Redacted for privacy Abstract approved: Ralph S. buatrano

The fate of organic and inorganic nitrogen inputs in an old-growth forest of the central Oregon Cascade Range

Creator:: Holub, Scott M.
Abstract:: Forests in the Pacific Northwest receive very little nitrogen through atmospheric deposition and thus studying the nitrogen cycle in this region can provide insights into how the unpolluted nitrogen cycle functions. I examined the fate of organic nitrogen versus inorganic nitrogen and the effect of tamlins on N retention by...
Resource Type:: Dissertation
Full Text:: . McDowell, K. Nadeihoffer, A. Magill, G. Berntson, M. Kamakea, S. McNuity, W. Currie, L. Rustad, and I

Seed and seedling ecology of Artemisia tridentata in a restoration context

Creator:: Wijayratne, Upekala C.
Abstract:: The semi-arid sagebrush steppe ecosystem is one of the largest biomes in North America. The steppe provides critical habitat and forage for wildlife and is economically important to recreation and livestock industries. However, the ecosystem is threatened primarily due to several negative effects associated with expansion of the exotic annual...
Resource Type:: Dissertation
Full Text:: . Stapp, C. R. Dickman, C. Gracia, S. Graham, J. R. Gutierrez, C. Hice, F. Jaksic, D. A. Kelt, M. Letnic

Understanding Host-Pathogen Interactions in the Sphaerulina musiva-Populus Pathosystem

Creator:: Dunnell, Kelsey Liann
Abstract:: Host-parasite interactions between the pathogen, Sphaerulina musiva, and its host, Populus spp., were examined in a series of studies. In the first study, variation in resistance of Populus nigra from 7 locations in Europe was differentiated based on the parameters cankers per cm and disease severity score. The analysis evaluated...
Resource Type:: Dissertation
Full Text:: ., Beauseigle, S., Dhillon, B., Ojeda, D. I., Bilodeau, G., Isabel, N., Gros-Louis, M. C., Kope, H., Zeglen, S

Transposon-induced nutritional and virulence mutants in two pathovars of Pseudomonas syringae

Creator:: Anderson, Dirk M.
Resource Type:: Masters Thesis
Full Text:: , A. M., and Patil, S. S. 1981. A bacterial leaf spot caused in yam bean by Pseudomonas syringae pv

Recruitment predictors of an endangered prairie species : a case study of Erigeron decumbens

Creator:: Gallagher, Katie J.
Abstract:: Preservation of rare plant species often requires establishment of new populations. Survivorship surveys are the most common method of post-introduction monitoring. However, they provide an incomplete picture of establishment success. This study is an attempt to develop a model for determining establishment success by determining the factors affecting recruitment in...
Resource Type:: Masters Thesis
Full Text:: approved: ______________________________________________________________________ Andrea S

The Ecology and Epidemiology of Xanthomonas hortorum pv. carotae in Central Oregon Carrot Seed Production Systems

Creator:: Baldino, Katelyn D.
Abstract:: Xanthomonas hortorum pv. carotae (Xhc) is an epiphytic, plant pathogenic bacterium that causes the disease bacterial blight of carrot (Daucus carota subsp. sativus). Infection with Xhc can result in blighting of leaves and umbels and reduce quality and yield of carrot seed crops. Carrot production in the United States approaches...
Resource Type:: Masters Thesis
Full Text:: (KBG), mint (M), parsley root (PR), roughstalk bluegrass (RBG) and wheat (W) inoculated with a

Localization and time of synthesis of wheat germ agglutinin in developing wheat (Triticum aestivum, L.)

Creator:: Triplett, Barbara Ann
Resource Type:: Dissertation
Full Text:: coincident with authentic WGA. The identity of the 35 S - protein eluting from the chitin column in 0.05 M

The effects of abscisic acid on protein synthesis in mature and immature embryos of wheat

Creator:: Mansfield, Michael Andrews
Resource Type:: Masters Thesis
Full Text:: enlarged and root hairs are evident, but there 20 day-old embryos 10-4 M ABA 19 A. B. Is le S 10-6

Contributions to the plant ecology of the Oregon coastal sand dunes

Creator:: Wiedemann, Alfred M.
Abstract:: Sand dunes are found along the coasts of most of the large land masses of the world. Because of their proximity to man and his activities, the maritime sand dunes of Europe, particularly Germany, France, Holland and Scandinavia, have the longest history of stabilization activities and botanical investigation. There are...
Resource Type:: Dissertation
Full Text:: the Siuslaw National Forest, U. S. Forest Service, to allow the establishment of permanent transects

Sulfation of fucoidin in Fucus zygotes : intermediates of sulfate transfer

Creator:: Peterman, Jeffrey J.
Resource Type:: Masters Thesis
Full Text:: Enzymatic Conjugation of Phenols with Sulfate. J. Biol. Chem. 233-472. Callow, M. E., S. J. Coughlan, and L

Understory herb and shrub responses to root trenching, pre-commercial thinning, and canopy closure in Douglas-fir forest of the western Cascades, Oregon

Creator:: Lindh, Briana C.
Abstract:: This thesis examines factors limiting understory herb presence and flowering in young second-growth Douglas-fir (Pseudotsuga menziesii) forests on the west side of the Cascade Mountains, Oregon, USA. I studied the belowground effects of canopy trees on understory herbs and shrubs in old-growth forests using trenched plots from which tree roots...
Resource Type:: Dissertation
Full Text:: Forests of the Western Cascades, Oregon. Abstract approved: Patricia S. Muir This thesis examines

Factors limiting the distribution of the sensitive lichen Usnea longissima in the Oregon Coast Range : habitat or dispersal?

Creator:: Keon, Dylan B.
Abstract:: The sensitive lichen Usnea longissima Ach., formerly a fairly common circumboreal species, has been extirpated from much of its range (e.g., Eastern Europe). Although the U.S. Pacific Northwest (PNW) remains a relative stronghold for the species, U longissima faces increasing pressure in the region from habitat loss, air pollution, and...
Resource Type:: Masters Thesis
Full Text:: Coast Range: Habitat or Dispersal? Abstract approved: _~B... Patricia S. Muir The sensitive lichen

Effects of variation in ecosystem carryover on biodiversity and community structure of forest floor bryophytes and understory vascular plants : a retrospective approach

Creator:: Traut, Bibit Halliday
Resource Type:: Masters Thesis
Full Text:: Bryophytes and Understory Vascular Plants: A Retrospective Approach Abstract approved: Patricia S. Muir

Advances in molecular systematics of clavicipitaceous fungi (Sordariomycetes: Hypocreales)

Creator:: Kepler, Ryan M.
Abstract:: Historical concepts of Clavicipitaceae have included a broad range of species that display diverse morphologies, ecological modes and host associations. When subjected to multigene phylogenetic investigation of evolutionary history, the family was found to be polyphyletic, largely driven by diversity in the genus Cordyceps, previously containing over 400 taxa. The...
Resource Type:: Dissertation
Full Text:: OF Ryan M. Kepler for the degree of Doctor of Philosophy in Botany and Plant Pathology

Relationships of exotic species and wildfire to the threatened plant Silene spaldingii

Creator:: Menke, Carolyn A.
Abstract:: In the canyon grasslands of Garden Creek Ranch Preserve in Idaho, where the threatened plant Silene spaldingii occurs and invasion by the exotic species Centaurea solstitialis and Bromus tectorum is proceeding rapidly, I examined environmental and community patterns of site invasion, and evaluated the apparent influence of invasion on Silene...
Resource Type:: Masters Thesis
Full Text:: and Wildfire to the Threatened Plant Silene spaldingii Abstract approved: Patncia S. Muir In the

Localization of sulfated polysaccharides in Fucus embryos

Creator:: Roberts, Mary Ann
Resource Type:: Masters Thesis
Full Text:: . Crayton, M. A. , E. Wilson, and R. S. Quatrano, 1 974. Sulfation of fucoidan in Fucus embryos. II

The effects of site preparation on native forb establishment in a wet prairie, Willamette Valley, Oregon

Creator:: Norman, Katherine N.
Abstract:: Wetlands and wet prairies are economically and environmentally valuable ecosystems, but many have been degraded or converted to other uses. As human understanding of wetlands' value has increased, restoration efforts have grown correspondingly. Restoration attempts use a diversity of methods, which often include seeding with native plant species. This thesis...
Resource Type:: Masters Thesis
Full Text:: Establishment in a Wet Prairie, Willamette Valley, Oregon Abstract approved: Patricia S. Muir

Ecology of Corydalis aquae-gelidae, a rare riparian plant

Creator:: Goldenberg, Douglas M.
Abstract:: Corydalis aquae-gelidae is a large herbaceous perennial in the Fumariaceae that has high habitat specificity. It is endemic to the western Cascade Range of Oregon and Washington, almost entirely on the Mt. Hood and Gifford Pinchot National Forests. It is a federal C2 candidate under the Endangered Species Act and...
Resource Type:: Masters Thesis
Full Text:: plant AN ABSTRACT OF THE THESIS OF Douglas M. Goldenberg for the degree of Master of Science in

An investigation of cherry gummosis

Creator:: Griffin, F. L. (Frederick Llewellyn)
Resource Type:: Masters Thesis
Full Text:: "S and Physiology. BacteriaJ Biology/ Life History. (ParisitologyrRule of Proof. E. CONTROL* • V 1

Modeling hemlock dwarf mistletoe (Arceuthobium tsugense subsp. tsugense) spread and intensification in mature uneven-aged forests in southeast Alaska

Creator:: Trummer, Loreen M.
Abstract:: Hemlock dwarf mistletoe (Arceuthobium tsugense (Rosendahi) G.N. Jones subsp. tsugense (western hemlock race)) is the most important and widespread disease of old-growth western hemlock forests in the Pacific Northwest. Although heavy infection of dwarf mistletoe can significantly increase growth loss and mortality of host trees, the parasite is also considered...
Resource Type:: Masters Thesis

A G-type Lectin Receptor-like Kinase Associated with Septoria Canker Resistance and Susceptibility Described using Multi-omics and Biotechnology

Creator:: Lenz, Ryan R.
Abstract:: Managers of forest and plantation ecosystems are encountering growing problems involving plant pathogens and the expanding geographic ranges of these pathogens. Historically unexposed stands are exceptionally vulnerable when a non-native pathogen is introduced because these pathogens can cause devastating disease in a host population that lacks co-evolved resistance mechanisms. One...
Resource Type:: Dissertation
Full Text:: : _____________________________________________________ Jared M. LeBoldus Managers of forest and plantation ecosystems are encountering growing

Pathological and ecological aspects of decline and mortality of Chamaecyparis nootkatensis in southeast Alaska

Creator:: Hennon, Paul Edward
Abstract:: Alaska-cedar (Chamaecvparis nootkatensIs (D. Don) Spach) is a valuable tree that is suffering from a serious decline and mortality of unknown cause throughout southeast Alaska. Epidemiological and pathological studies were initiated to determine if a pathogen is the primary cause of this problem. By examining old aerial photographs and by...
Resource Type:: Dissertation
Full Text:: Southeast Alaaa Abstract approved: Redacted for Privacy Everett-M. Hansen Alaska-cedar (Chamaecvparis

Hop cone tip blight : a new disease in the Pacific Northwest

Creator:: Bienapfl, John C.
Abstract:: A necrosis at the tip of cones was observed on hop (Humulus lupulus), cultivar "Nugget", grown in Oregon in the early 1990's. Fusarium sambucinum and F. avenaceum were recovered from symptomatic cones in 1998 and preliminary inoculation experiments suggested both Fusarium species could cause hop cone necrosis. Studies were carried...
Resource Type:: Masters Thesis
Full Text:: Blight: A New Disease in the Pacific Northwest Abstract approved: Cynthia M. Ocamb A necrosis at the

Pathogenic variability and adaptation of Septoria tritici to different wheat cultivars

Creator:: Ahmed, Hafiz Uddin
Abstract:: Experiments were done to determine pathogenic variability and pathogenic adaptation of Septoria tritici to different wheat cultivars. Fifteen S. tritici isolates from California, Oregon, and Texas were evaluated on seedlings of two sets of geographically diverse wheat cultivars under greenhouse conditions. Significant isolate effects, cultivar effects, and isolate X cultivar...
Resource Type:: Dissertation
Full Text:: Adaptation of Septoria Title: tritici to Different Wheat Cultivars. Abstract approved: Stella M

Morphology, ultrastructure and mating of sporidia of a wheat-bunt fungus, Tilletia caries (DC.) Tul.

Creator:: Kollmorgen, James Frederick
Abstract:: The teliospore of Tilletia caries germinates to produce a promycelium with a whorl of primary sporidia at its tip. The time between emergence of the promycelium and the development of primary sporidia averaged 2.3 h. Fusion between compatible sporidia occurred within an additional 3.8 h. Primary sporidia appeared to be...
Resource Type:: Dissertation
Full Text:: , 710-718. Akai, S., Fukutomi, M., Kunoh, H., Shiraishi, M., 1976: Fine structure of the spore wall and

Taxonomy of desert truffles : the genera Phaeangium and Tirmania

Creator:: Alsheikh, Abdulmagid M.
Abstract:: Mycorrhizal fungi are important in food production of arid lands. The desert truffles not only form a symbiotic association with range plants but also form fruiting bodies which are both prized as food and nutritious. The taxonomy and ecology of two genera of desert truffles are treated in this thesis....
Resource Type:: Masters Thesis
Full Text:: ornamentation, X1307. 4. 8-spored ascus, X1307. 26 LITERATURE CITED Awameh, M. S., and A. M. Alsheikh

Pathogenicity of Phytophthora species from Oregon waterways

Creator:: Navarro, Sarah M.
Abstract:: Described as one of the most destructive pathogens of agricultural crops and forest trees, Phytophthora is a genus of microorganisms containing over 100 known species. Phytophthora alni has caused collar and root disease in alders throughout Europe and a form of the species has recently been isolated in North America....
Resource Type:: Masters Thesis
Full Text:: h y g y n o u s p a ra g y n o u s h y p h a l sw e ll in g s ch la m y d o

Taxomony and mycorrhizal ecology of the desert truffles in the genus Terfezia

Creator:: Alsheikh, Abdulmagid M.
Abstract:: Mycorrhizal fungi in arid and semiarid rangelands have received little study in southwest Asia and north Africa, although they are important in food production and rangeland productivity. The desert truffles of the genera Terfezia and Tirmania form fruiting-bodies and mycorrhizae with rangeland plants. This thesis treats the taxonomy and the...
Resource Type:: Dissertation
Full Text:: part by National Science Foundation Grant BSR 9007186 to Drs. Nancy S. Weber, James M. Trappe and

Phylogenetics, population genetics, molecular epidemiology, and pathogenicity of the Douglas-fir Swiss needle cast pathogen Phaeocryptopus gaeumannii

Creator:: Winton, Loretta M.
Abstract:: A hierarchical series of studies, based mainly on molecular data, was conducted to elucidate the life history of the Douglas-fir Swiss needle cast pathogen Phaeocryptopus gaeumannii at macro- and micro-evolutionary scales. This information was then utilized to design and evaluate molecular diagnostic tools for use in studies on the epidemiology...
Resource Type:: Dissertation
Full Text:: AN ABSTRACT OF THE DISSERTATION OF Loretta M. Winton for the

Factors affecting inter-tree root contact and the transmission of Phellinus weirii in young-growth Douglas-fir

Creator:: Reynolds, Keith M.
Abstract:: Groups of second-growth Douglas-fir (Mirb.) Franco were excavated in plots of two to six trees on two sites in the vicinity of Cowichan Lake, Vancouver Is., British Columbia. Eleven excavation plots provided 36 trees which could be studied in pairs (a total of 50 pairs) in order to ascertain the...
Resource Type:: Masters Thesis
Full Text:: PHELLINUS WEIRII IN YOUNG-GROWTH DOUGLAS-FIR Abstract approved: Redacted for Privacy tverett M. Hansen

Biology of chlamydospores of Phytophthora ramorum

Creator:: Smith, Aaron Lee
Abstract:: The chlamydospore is a survival spore produced by 35 of the 75 described species of Phytophthora. Phytophthora ramorum Werres, de Cock & Man in't Veld, the causal agent of Sudden Oak Death (SOD), produces abundant chlamydospores in artificial culture and plant tissue. The chlamydospore is likely the most important survival...
Resource Type:: Masters Thesis
Full Text:: Abstract approved: Everett M. Hansen The chlamydospore is a survival spore produced by 35 of the

Presence and pathogenicity of Fusarium and Verticillium species in commercial red radish (Raphanus sativus) seed production in the Willamette Valley of Oregon

Creator:: Bomberger, Rachel A.
Abstract:: Commercial radish seed producers in the Willamette Valley of Oregon have observed a late season wilt in their seed fields. Twenty-two fields were surveyed for wilt in the Willamette Valley during June through August 2012 and 2013. Plants exhibiting wilt symptoms were collected from the fields and examined for vascular...
Resource Type:: Masters Thesis
Full Text:: . Plant Disease 89:4-11. 18. Enya, J., Togawa, M., Takeuchi, T., Yoshida, S., Tsushima, S., Arie, T

Patterns of ectomycorrhizal host-fungus specificity in the Pacific Northwest

Creator:: Molina, R.
Abstract:: Results from approximately 400 fungus-host pure culture inoculations indicate that specificity of ectomycorrhizal associations is a complex phenomenon and cannot be based solely on field observations of sporocarp-host associations. Of the numerous sporocarp-host specific fungi tested, most formed ectomycorrhizae with one or more unexpected, non-associated hosts. These results conclusively demonstrate...
Resource Type:: Dissertation
Full Text:: HOST-FUNGUS SPECIFICITY IN THE PACIFIC NORTHWEST Redacted for Privacy Abstract approved: Dr. James M

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