Index Catalog // ScholarsArchive@OSU

Comprehensive timber harvest planning for plantation forests on difficult terrain : Sokoine University of Agriculture Training Forest, Tanzania

Creator:: Shemwetta, Dunstan T. K.
Abstract:: Plantation forests on mountainous areas in Tanzania, East Africa, were successfully established in the 1950's. Harvesting started in the 1970's to meet increased national timber demand. Current problems of unharvested areas and potential environmental degradation are associated with uncontrolled harvests, mismatch of harvest systems to site needs, and post-harvest practices....
Resource Type:: Dissertation

Shuddering blood

Creator:: Kroll, Adam L.
Abstract:: This collection of six individual writings, both fiction and creative non-fiction, is an exploration in narrative first-person voices and multiple themes, such as the loss of innocence, modernization versus traditions/myths, the California Central Valley, death, creativity, language, change, and the pressures of the future. Though abstractly linked at times, these...
Resource Type:: Masters Thesis

Insects associated with black stain root disease of Douglas-fir in western Oregon

Creator:: Witcosky, Jeffrey John
Abstract:: The root systems of Douglas-fir trees infected with Verticicladiella wagenerii and assigned by crown color and terminal growth characteristics to several stages of decline were excavated at three widely separated sites in the Coast Range of Oregon. Data were gathered on insect species present, extent of colonization of the root...
Resource Type:: Masters Thesis
Full Text:: my minor professor Dr. Everett Hansen for his unwavering confidence and financial support of my

The effects of Phytophthora ramorum stem inoculation on aspects of tanoak physiology and xylem function in saplings and seedlings

Creator:: Stamm, Elizabeth A.
Abstract:: Phytophthora ramorum, an oomycete plant pathogen, is the causal agent of sudden oak death, a serious disease of Fagaceous trees in California and Oregon over the last decade. Tanoak (Notholithocarpus densiflorus) is one of the most susceptible host species, but the cause of host mortality is poorly understood. Previous research...
Resource Type:: Masters Thesis
Full Text::  my major professor, Jennifer Parke, and my  committee members, Everett Hansen and Barb Lachenbruch

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

Toxicity of methyl bromide to fungi inhabiting Dahurian larch wood

Creator:: Rhatigan, Ronald G.
Abstract:: Concerns over the possibility of exotic pest introductions from eastern Russia to the West Coast of the United States due to proposed log imports raises the question of the effectiveness of possible mitigation measures. Toxicity of methyl bromide to representative pathogenic fungi was tested by exposing Armillaria ostoyae, Heterobasidion annosum,...
Resource Type:: Masters Thesis

Growth analysis of heterogeneous stands of ponderosa pine and lodgepole pine in central Oregon

Creator:: Mainwaring, Douglas B.
Abstract:: Basal area and height growth were analyzed for individual trees in uneven-aged ponderosa and lodgepole pine stands in central Oregon. Basal area growth was modeled as a function of other stand and tree variables to address five general objectives: 1) to compare the predictive ability of distance-dependent versus distance-independent stand...
Resource Type:: Masters Thesis
Full Text:: thank the other members of my committee, Mike Newton and Everett Hansen. I asked them to join the

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:: threshold value of propagules needed to initiate a successful disease epidemic (Hansen et al. 2005; Banko

Histological comparisons of needle tissues of four species of white pine infected by Cronartium ribicola

Creator:: Sweeney, Katarina
Abstract:: Hypersensitive response-like (HR-like) needle reactions to infection by the white pine blister rust pathogen, Cronartium ribicola, have been reported for several species of five needle pines native to western North America. The best-studied examples are in Pinus monticola and P. lambertiana. In these species a "needle spot" phenotype has been...
Resource Type:: Masters Thesis

Road networks, timber harvest, and the spread of Phytophthora root rot infestations of Port-Orford-cedar in southwest Oregon

Creator:: Clark, William C.
Abstract:: Phytophthora lateralis is the causal agent of cedar root rot, a fatal forest pathogen whose principal host is Chamaecyparis lawsoniana (Port-Orford-cedar), a predominantly riparian-restricted endemic tree species of ecological, economical, and cultural importance to coastal Oregon and California. Local scale distribution of P. lateralis is thought to be associated with...
Resource Type:: Masters Thesis

ScholarsArchive@OSU

Comprehensive timber harvest planning for plantation forests on difficult terrain : Sokoine University of Agriculture Training Forest, Tanzania

Shuddering blood

Insects associated with black stain root disease of Douglas-fir in western Oregon

The effects of Phytophthora ramorum stem inoculation on aspects of tanoak physiology and xylem function in saplings and seedlings

Pathways of infection of Phytophthora ramorum in rhododendron

Toxicity of methyl bromide to fungi inhabiting Dahurian larch wood

Growth analysis of heterogeneous stands of ponderosa pine and lodgepole pine in central Oregon

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

Histological comparisons of needle tissues of four species of white pine infected by Cronartium ribicola

Road networks, timber harvest, and the spread of Phytophthora root rot infestations of Port-Orford-cedar in southwest Oregon

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