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Epidemiological insights into Armillaria mellea root rot in a managed Ponderosa pine forest

Creator:: Shaw, Charles G. (Charles Gardner) 1948-
Abstract:: Root rot of ponderosa pine caused by Armillaria mellea was studied in a pine forest that had been under management for 30 years in Klickitat County, Washington. Information sources included disease survey, detailed observation and description of specific disease situations, and examination of roots in situ and removed. Roughly circular...
Resource Type:: Dissertation
Full Text:: AN ABSTRACT OF THE THESIS OF CHARLES G. SHAW III for the

Morphology, physiology and pathogenicity of Trichoconis padwickii Ganguly, the cause of Stackburn disease of rice

Creator:: Chuaiprasit, Chalermlarb
Resource Type:: Dissertation
Full Text:: OF RICE Abstract approved Charles M. Leach The morphology, physiology and pathogenicity of a fungus

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

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

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

Pathogenesis and intertree transmission of Verticicladiella wageneri in Douglas-fir (Pseudotsuga menziesii)

Creator:: Hessburg, Paul F.
Abstract:: Verticicladiella wageneri Kendr. is a vascular wilt pathogen of Douglas-fir in the Pacific Northwest, The disease is characterized by black staining of colonized sapwood; crown symptoms are those typical of a wilting syndrome. Histopathological studies revealed that the pathogen is limited to the xylem but causes vascular dysfunction in both...
Resource Type:: Dissertation
Full Text:: ) Abstract approved: Redacted for Privacy Dr. Lewis F. Roth for Dr. Everett M. Hansen Verticicladiella

Studies on canker in European filbert caused by Anisogramma anomala

Creator:: Postman, Joseph D.
Abstract:: Anisogramma anomala causes a stem canker of filberts, Corylus avellana. This disease became a threat to the main U.S. filbert growing region when it was introduced into the Pacific Northwest around 1968. Various methods of artificially inoculating filbert trees and seeds were explored. Less than 1% of potted filbert trees...
Resource Type:: Masters Thesis
Full Text:: anomala AN ABSTRACT OF THE THESIS OF Joseph D. Postman for the degree of Master of Science in Botany

Pathways of infection of Phytophthora ramorum in rhododendron

Creator:: Lewis, Carrie D.
Abstract:: Phytophthora ramorum, a plant pathogen, is the cause of sudden oak death and ramorum blight and shoot die-back. It has a wide host range including many native forest species and common nursery plants. The lack of knowledge regarding infection biology of P. ramorum limits our understanding of its ecology and...
Resource Type:: Masters Thesis

Viability and infective potential of Phytophthora pini zoospores in a recirculating irrigation system

Creator:: Shay, Sarah D.
Abstract:: Phytophthora pini Leonian, recently re-established from P. citricola I, is a pathogen with a wide range of forest and nursery hosts. It causes foliar infections in horticultural nurseries in Oregon, where recirculating irrigation systems are common. Increased use of recirculating irrigation systems may contribute to disease caused by waterborne plant...
Resource Type:: Masters Thesis
Full Text:: AN ABSTRACT OF THE THESIS OF Sarah D. Shay for the degree of Master of Science in Botany and

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:: Genetics of Phellinus weirii Abstract approve d Redacted for Privacy Phellinus weirii (Murr.) Gilbertson

ScholarsArchive@OSU

Epidemiological insights into Armillaria mellea root rot in a managed Ponderosa pine forest

Morphology, physiology and pathogenicity of Trichoconis padwickii Ganguly, the cause of Stackburn disease of rice

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

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

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

Pathogenesis and intertree transmission of Verticicladiella wageneri in Douglas-fir (Pseudotsuga menziesii)

Studies on canker in European filbert caused by Anisogramma anomala

Pathways of infection of Phytophthora ramorum in rhododendron

Viability and infective potential of Phytophthora pini zoospores in a recirculating irrigation system

Genetics of sexuality and population genetics of Phellinus weirii

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