Index Catalog // ScholarsArchive@OSU

Phytophthora species and riparian alder tree damage in western Oregon

Creator:: Sims, Laura L.
Abstract:: The genus Phytophthora contains some of the most destructive pathogens of forest trees, including the most destructive pathogen of alder in recent times, Phytophthora alni. Alder trees were reported to be suffering from canopy dieback in riparian ecosystems in western Oregon, which prompted a survey of alder health and monitoring...
Resource Type:: Dissertation
Full Text:: ) and it causes alder disease elsewhere in Europe. The alder Phytophthora can be isolated from

Arthropod community structure in regenerating Douglas-fir and red alder forests : influences of geography, tree diversity and density

Creator:: Schaerer, Brett L.
Abstract:: The structuring of canopy arthropod communities was reviewed and investigated in relation to tree species diversity and its component factors, interspersion of different species and density of each tree species. Fifteen treatments of Douglas-fir (Pseudotsuga menziesii) and red alder (Alnus rubra) (various densities and proportions of each) were randomly assigned...
Resource Type:: Masters Thesis
Full Text:: red alder forests : influences of geography, tree diversity and density AN ABSTRACT OF THE THESIS OF

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:: , from a single branch to a whole stand (Ragenovich and Ciesla, 2008). Disease agents of red alder

Screening for Viral Disease in the OSU Tomato Breeding Program

Creator:: Kershner, Alexandria C.
Abstract:: Disease control is a crucial aspect of plant breeding for researchers as well as commercial producers. After samples from OSU's tomato breeding program tested positive for Columnea latent viroid in a screen done by a private company, secondary testing was done by the USDA laboratory in Corvallis which suggested that...
Resource Type:: Honors College Thesis
Full Text:: 1 Screening for Viral Disease in the OSU Tomato Breeding

The biology and control of the insect vectors of potato viruses in Oregon

Creator:: Crumb, S. E. (Samuel Ebb)
Resource Type:: Dissertation
Full Text:: project. He has grown the tuber samples from insecticide plots and determined the amount of disease

Time effect of wild oat removal on winter wheat yield

Creator:: Abu-Irmaileh, Barakat Eid Ahmad
Abstract:: The extent of the competitive effect of wild oats on winter wheat yield was estimated in field studies on three commercial wheat farms in the Willamette Valley. The morphological development of the wild oat plants was also documented. Wild oats were removed from stands of wheat in six different treatments;...
Resource Type:: Masters Thesis
Full Text:: three different growth stages, treatment with barban, continuous hand weeding, and barban plus

Blueberry gall midge : a possible new pest in the Northwest : identification, life cycle, and plant injury

Creator:: Oregon State University. Extension Service and Yang, Wei Qiang
Abstract:: In the blueberry production regions of Florida, Georgia, and Mississippi, blueberry gall midge is a serious insect pest that affects rabbiteye and southern highbush blueberries, causing substantial yield loss by damaging flower buds. The midge is present from the southeastern to the northern United States, where it feeds on vegetative...
Resource Type:: Technical Report
Full Text:: pest that affects rabbiteye and southern highbush blueberries, causing substantial yield loss by

Isolation, purification, serology and nature of rose mosaic virus

Creator:: Halliwell, R. S. (Robert S.)
Resource Type:: Dissertation
Full Text:: virus in some varieties, and a lack of a reliable assay method, makes the selection of disease-free

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:: morphology and physiology and produces disease symptoms similar to those of P. ramorum but with lower

Development, detection and elimination of Verticillium dahliae in mint shoot cultures and effects of bacterial cultures and bacterization on the growth and disease development

Creator:: Wang, Nan
Abstract:: Roots of greenhouse-grown peppermint (Mentha piperita L.) and spearmint (Mentha spicata L.) plants and in vitro-grown shoot cultures were inoculated with Verticillium dahliae conidial suspensions to study symptom development, detection, and elimination of the V. dahliae. There were significant differences in the symptom expression of control and infected shoot cultures...
Resource Type:: Masters Thesis
Full Text:: Bacterization on the Growth and Disease Development Abstract approved:' Barbara M. Reed Roots of greenhouse

ScholarsArchive@OSU

Phytophthora species and riparian alder tree damage in western Oregon

Arthropod community structure in regenerating Douglas-fir and red alder forests : influences of geography, tree diversity and density

Pathogenicity of Phytophthora species from Oregon waterways

Screening for Viral Disease in the OSU Tomato Breeding Program

The biology and control of the insect vectors of potato viruses in Oregon

Time effect of wild oat removal on winter wheat yield

Blueberry gall midge : a possible new pest in the Northwest : identification, life cycle, and plant injury

Isolation, purification, serology and nature of rose mosaic virus

Comparative epidemiology of Phytophthora diseases of Rhododendron

Development, detection and elimination of Verticillium dahliae in mint shoot cultures and effects of bacterial cultures and bacterization on the growth and disease development

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