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Modeling abiotic influences on disease dynamics for the complex life cycle of the myxozoan parasite Ceratomyxa shasta

Creator:: Ray, Robert Adam
Abstract:: Most parasites and their hosts live in a balance within their environment; however a disease outbreak can occur when either the parasite, host, or environment, are perturbed. Myxozoan parasites are associated with a wide variety of cultured and wild fish populations. Most myxozoans are relatively benign to their vertebrate host;...
Resource Type:: Dissertation
Full Text:: of Pacific salmon. In the Klamath River, CA, USA, C. shasta infection is associated with decreased

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
Full Text:: preventing further pathogen colonization. Structural analyses of early C. ribicola needle colonization in

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:: Stain Root Disease of Douglas-fir in Western Oregon. Abstract approved: Redacted for Privacy ee C

The spatial distribution of wood-nesting ants in the central Coast Range of Oregon

Creator:: Nielsen, Gary R. (Gary Richard), 1956-
Resource Type:: Dissertation
Full Text:: thank Dr. Everett Hansen and Dr. Donald Zobel for loaning field and laboratory equipment to me. I am

Molecular karyotyping of Ustilago hordei and related smut fungi

Creator:: McCluskey, Kevin
Resource Type:: Dissertation
Full Text:: committee: Da llice Mills, Terri Lomax, Joyce Loper, Everett Hansen, and Tom Wolpert. A special thanks is

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:: this study. P. pini is a “warm season” Phytophthora with an optimal growth temperature of 30°C and

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

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:: graduate studies committee, Walter Mahaffee, Chris Mundt, Everett Hansen and Shawn Mehlenbacher for

Modeling changes in flexural properties of softwood beams during fungal decomposition

Creator:: Mitsuhashi Gonzalez, June M.
Abstract:: Moisture intrusion in residential structures can lead to substantial fungal decay and this damage costs billions in repair/replacement costs. The extent of damage and the rate at which it occurs are primarily dependent on the wood moisture content and temperature in the structure. Determining the risk of decay for various...
Resource Type:: Dissertation
Full Text:: Dr. Barbara Lachenbruch – Committee Member Dr. Mike Milota – Committee Member Dr. Everett Hansen

New application of crystalline cellulose in rubber composites

Creator:: Bai, Wen
Abstract:: Rubber without reinforcement has limited applications. The strength of reinforced rubber composites can be ten times stronger than that of unreinforced rubbers. Therefore, rubber composites are widely used in various applications ranging from automobile tires to seals, valves, and gaskets because of their excellent mechanical elastic properties. Silica and carbon...
Resource Type:: Dissertation
Full Text:: . I would also like to extend my appreciation to my committee members, Dr. Everett Hansen, Dr, Joe

ScholarsArchive@OSU

Modeling abiotic influences on disease dynamics for the complex life cycle of the myxozoan parasite Ceratomyxa shasta

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

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

The spatial distribution of wood-nesting ants in the central Coast Range of Oregon

Molecular karyotyping of Ustilago hordei and related smut fungi

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

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

Comparative epidemiology of Phytophthora diseases of Rhododendron

Modeling changes in flexural properties of softwood beams during fungal decomposition

New application of crystalline cellulose in rubber composites

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