Index Catalog // ScholarsArchive@OSU

Histological examination of Phytophthora ramorum in Notholithocarpus densiflorus bark tissues

Creator:: Botts, Molly M.
Abstract:: Colonization of N. densiflorus tissues by P. ramorum is not well understood. The pathogen is able to colonize nearly all tissues of this host but it is unclear how a tree is ultimately killed. Because this is such a destructive invasive pathogen, it is important to investigate its pathogenic strategy....
Resource Type:: Masters Thesis
Full Text:: _________________________________________________________________________ Everett M. Hansen Colonization of N. densiflorus tissues by P. ramorum is not well

Environmental factors influencing the rate of spread of Phellinus weirii (Murr.) Gilbertson in young-growth Douglas-fir

Creator:: Angwin, Peter A.
Abstract:: Studies to identify the environmental factors that influence the rate of ectotrophic mycelial growth of Phellinus weirii (Murr.) Gilbertson along Douglas-fir roots were undertaken both in the laboratory and in the field. The effects of soil pH, nitrogen, moisture, temperature, microorganisms and bulk density were investigated. In the lab, the...
Resource Type:: Masters Thesis
Full Text:: Oregon State University: Dr. Everett Hansen, who made all of this possible. Dr. Lewis Roth and Dr. Earl

Genetics of sexuality and population genetics of Phellinus weirii

Creator:: Angwin, Peter A.
Abstract:: Phellinus weirii (Murr.) Gilbertson, cause of laminated root and butt rot, is a heterothallic basidiomycete lacking clamp connections. Two biological species groups of the fungus have been hypothesized, the Douglas-fir and cedar-types, on the basis of physiological, morphological and epidemiological differences. Single-spore and vegetative isolates differ in cultural morphology, nuclear...
Resource Type:: Dissertation
Full Text:: State University: Dr. Everett Hansen, for his help, patience and guidance through good times and bad

Factors influencing the development of onion pink root disease incited by Pyrenochaeta terrestris (Hansen) Gorenz, Walker, Larson

Creator:: Pack, Paul Eugene
Abstract:: A study was conducted of the influence of various climatic and soil factors on the development of onion pink root disease and of the influences of temperature, light, pH, carbon and nitrogen sources, and vitamins on the growth in vitro of an Oregon isolate of the pink root fungus, Pyrenochaeta...
Resource Type:: Masters Thesis
Full Text:: Disease Incited By Pyrenochaeta Terrestris (Hansen) Gorenz, Walker, Larson AN ABSTRACT OF THE THESIS OF

The identification and quantification of Pyrenochaeta terrestris (Hansen) Gorenz, Walker, and Larson, propagules in soil and onion roots

Creator:: Flota, James Ernest
Resource Type:: Masters Thesis
Full Text:: terrestris (Hansen) Gorenz, Walker, and Larson, propagules in soil and onion roots AN ABSTRACT OF THE

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:: OF THE THESIS OF Katherine N. Norman for the degree of Master of Science in Botany and Plant

Development, reproductive morphology, and cytology of Pelvetiopsis limitata (Setchell) Gardner (Phaeophyta, Fucales)

Creator:: Henry, Eric Charles
Abstract:: Pelvetiopsis limitata (Setchell) Gardner (Phaeophyta, Fucales), collected on the central Oregon coast, was studied by electron microscopy, and by light microscopy using methacrylate embedding and toluidine blue, acid fuchsin, PAS and anilin blue staining. The sperm of both P. limitata and Pelvetia fastigiata (J. Agardh) DeToni (from northern California) are...
Resource Type:: Masters Thesis
Full Text:: Pelvetiopsis limitata (Setchell) Gardner (Phaeophyta, Fucales) AN ABSTRACT OF THE THESIS OF Eric Charles

Distribution and prediction of Swiss needle cast of Douglas-fir in coastal Oregon

Creator:: Rosso, Pablo H.
Abstract:: This study was directed to improve our understanding of the ecology of Swiss needle cast (SNC) of Douglas-fir, a disease that produces extensive damage to forests and plantation in the coastal region of Oregon and Washington. A disease prediction model for the coastal area of Oregon was built by establishing...
Resource Type:: Dissertation
Full Text:: help, support, friendship and love. Everett Hansen, mi advisor. The members of my committee: Gay

The epidemiology of sudden oak death in Oregon forests

Creator:: Peterson, Ebba K.
Abstract:: The phytopathogen Phytophthora ramorum (Werres, DeCock & Man in't Veld), causal agent of Sudden Oak Death (SOD) of oaks (Quercus spp.) and tanoaks (Notholithocarpus densiflorus syn. Lithocarpus densiflorus), is established in coastal forests of the western United States. Since the discovery of SOD in the Douglas-fir / tanoak forests of...
Resource Type:: Dissertation
Full Text:: : Everett M. Hansen The phytopathogen Phytophthora ramorum (Werres, DeCock & Man in’t Veld), causal

Susceptibility of golden chinquapin (Chrysolepis chrysophylla) to Phytophthora cambivora

Creator:: Saavedra, Angel Luis
Abstract:: In early 2000, unusual mortality of a native North American tree, golden chinquapin, was reported by the USDA-Forest Service. Dying trees exhibited girdling cankers in the inner bark of the lower bole, branch flagging and defoliation. Isolations from necrotic tissues and soil associated with diseased or killed trees yielded Phytophthora...
Resource Type:: Masters Thesis
Full Text:: . Abstract approved:_ Everett 1\¥. Hansen In early 2000, unusual mortality of a native North American tree

ScholarsArchive@OSU

Histological examination of Phytophthora ramorum in Notholithocarpus densiflorus bark tissues

Environmental factors influencing the rate of spread of Phellinus weirii (Murr.) Gilbertson in young-growth Douglas-fir

Genetics of sexuality and population genetics of Phellinus weirii

Factors influencing the development of onion pink root disease incited by Pyrenochaeta terrestris (Hansen) Gorenz, Walker, Larson

The identification and quantification of Pyrenochaeta terrestris (Hansen) Gorenz, Walker, and Larson, propagules in soil and onion roots

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

Development, reproductive morphology, and cytology of Pelvetiopsis limitata (Setchell) Gardner (Phaeophyta, Fucales)

Distribution and prediction of Swiss needle cast of Douglas-fir in coastal Oregon

The epidemiology of sudden oak death in Oregon forests

Susceptibility of golden chinquapin (Chrysolepis chrysophylla) to Phytophthora cambivora

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