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Filtering by: Creator Helfgott, Gabriela I. Degree Field Botany and Plant Pathology Degree Level Doctoral

Landscape Genomics and Climatic Responses of Willamette Valley Alders

Creator:

Kral, George L.

Abstract:

The climate of the Pacific Northwest is in flux, and existing forest ecosystems are stressed and poised to shift in fundamental ways, with or without human intervention. This dissertation probes the nature of forest responses to environmental change through investigations of morphology and genetics of three species of alder co-occurring...

Resource Type:

Dissertation

Full Text:

approved: ______________________________________________________ Aaron I. Liston The climate
Genetic Structure in Populations of the Douglas-fir Swiss Needle Cast Fungus Nothophaeocryptopus gaeumannii

Creator:

Bennett, Patrick I.

Abstract:

The fungus Nothophaeocryptopus gaeumannii is the causative agent of Swiss needle cast (SNC), a foliar disease of Douglas-fir. Disease is characterized by premature loss of foliage and reduced growth resulting from the inhibition of photosynthesis due to the occlusion of stomata by the ascocarps of N. gaeumannii. Although the disease...

Resource Type:

Dissertation

Full Text:

AN ABSTRACT OF THE DISSERTATION OF Patrick I. Bennett for the degree of Doctor of Philosophy in
Factors influencing the effects of host diversity on plant disease epidemics for wheat stripe rust and potato late blight

Creator:

Garrett, Karen A.

Abstract:

Most studies of plant disease epidemiology have focused on epidemics in host populations composed of a single genotype. But crop plant diversity can be a useful means of improving the deployment of resistance genes. In a series of experiments with wheat stripe rust and potato late blight, we studied factors...

Resource Type:

Dissertation

Full Text:

Approved: Major Professor, representing Botany and Plant Pathology Dean of Gr d chool I understand