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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:: good adventures. * Thanks to J. Brunet, C. Cowger, D. 1. Coyle, M. E. Daub, A. M. Jarosz, R. J

Effect of wheat cultivar mixtures on populations of Puccinia striiformis races

Creator:: DiLeone, Julie A.
Abstract:: This study quantified the frequency of simple versus complex races of Puccinia striiformis Westend. in mixtures of wheat cultivars possessing different race-specific resistance genes. A simple race of a pathogen can infect only one component, and a complex race of the pathogen can infect two or more components of an...
Resource Type:: Masters Thesis
Full Text:: Puccinia striiformis races AN ABSTRACT OF THE THESIS OF Julie A. DiLeone for the degree of Master of

Effects of grazing and nitrogen enrichment on the taxonomic structure of periphyton assemblages in lotic ecosystems

Creator:: Lundberg, Chris H.
Resource Type:: Masters Thesis
Full Text:: limnephilid caddisfly Dicosmoecus gilvipes (Hagen) were investigated in a 50-day laboratory experiment

Effects of substrate relief, light intensity and herbivory on the distribution and abundance of periphyton in laboratory streams

Creator:: DeNicola, Dean M.
Resource Type:: Dissertation
Full Text:: oregona and §tiwclonium tenue. a) Top substrates a 20 uE m-4 s- I. b) Recessed sub§traes at 20 uE m4 sL. c

A systematic and ecological study of Astragalus diaphanus (Fabaceae)

Creator:: Wright, Carolyn E.
Abstract:: Astragalus diaphanus is a rare plant endemic to the John Day River drainage of north-central Oregon. This species has several interesting features, including the dimorphism of its fruit and its geographical isolation from the two nearest taxonomically related species, which occur in Colorado. This study addressed the species' distribution and...
Resource Type:: Masters Thesis
Full Text:: characteristics at three sites of A. diaphanus. SITE* %NH-N %P %C pH 2ESC 0.003 0.055 0.12 7.5-7.6 Homestead

Development of in vitro lily scale budlets as related to virus elimination

Creator:: Ruttum, Joanne C.
Abstract:: Lily hybrids vary in their ability to produce virus-free (VF) bulblets when grown from virus-infected scales in tissue culture. Asiatic hybrids typically produce a higher percentage of in vitro VF scale bulblets than do Lilium longiflorum cultivars. Three hypotheses concerning the cause of this variation are tested on five lily...
Resource Type:: Masters Thesis
Full Text:: vitro Lily Scale Buiblets as Related to Virus Elimination by Joanne C. Ruttum A THESIS submitted to

Effects of single and multiple stressors on communities of wheat and wild oats

Creator:: Pfleeger, Thomas G.
Abstract:: Most plant toxicology tests developed in support of environmental laws use a single stress applied to an individual plant. While tests using individual species or stresses require fewer resources and are easier to interpret, they are under increasing criticism for being unrealistic and missing important ecological interactions. The objective of...
Resource Type:: Dissertation
Full Text:: Stressors on Communities of Wheat and Wild Oats. Abstract approved: Christopher C. Mundt Most plant

Cephalosporium stripe of wheat : seedling-based resistance screening and pathogenic variability

Creator:: Cowger, Christina
Abstract:: Cephalosporium stripe of wheat (Triticum aestivum), caused by the soilborne fungus Cephalosporium gramineum, results in significant yield reductions in dryland winter wheat crops of the U.S. Pacific Northwest. The development of resistant cultivars offers the best hope for disease control. Breeding for resistance is hampered by the long trial times...
Resource Type:: Masters Thesis
Full Text:: to investigate pathogenic variability in C. gramineum. In two experiments, a total of eight

Pendent Usnea (Lichens; Ascomycetes; Parmeliaceae) in Western Oregon : taxonomy; morphological characters; and geographical distribution

Creator:: Pittam, Sherry K.
Abstract:: Pendent Usnea species were collected in western Oregon and examined. Character states, such as cortex-medulla-axis ratio; fibril length; papilla diameter; branching patterns; and presence or absence of fibrils, papillae, soredia, isidia; plus chemistry, were recorded and analyzed by inspection for differences. Historical names were researched in the literature. A comparison...
Resource Type:: Masters Thesis
Full Text:: BIBLIOGRAPHY 57 APPENDICES 62 Appendix A Distribution Maps 63 Appendix B Specimen Data 70 Appendix C Other

Interactive effects of stripe rust and plant competition in heterogeneous wheat populations

Creator:: Finckh, Maria Renate
Abstract:: Disease has been implied as an important selective force acting in plant populations. This study was conducted to determine the effects of stripe rust (Puccinia striiformis) on the population dynamics of wheat (Triticum aestivum) cultivar mixtures. Five wheat cultivars were grown in pure stands and all possible mixtures at three...
Resource Type:: Dissertation
Full Text:: ; Leonard, 1969 a,b,c; Mundt and Browning, 1985a,b; Prakash and Heather, 1988; Van der Plank, 1968; Wolfe

ScholarsArchive@OSU

Factors influencing the effects of host diversity on plant disease epidemics for wheat stripe rust and potato late blight

Effect of wheat cultivar mixtures on populations of Puccinia striiformis races

Effects of grazing and nitrogen enrichment on the taxonomic structure of periphyton assemblages in lotic ecosystems

Effects of substrate relief, light intensity and herbivory on the distribution and abundance of periphyton in laboratory streams

A systematic and ecological study of Astragalus diaphanus (Fabaceae)

Development of in vitro lily scale budlets as related to virus elimination

Effects of single and multiple stressors on communities of wheat and wild oats

Cephalosporium stripe of wheat : seedling-based resistance screening and pathogenic variability

Pendent Usnea (Lichens; Ascomycetes; Parmeliaceae) in Western Oregon : taxonomy; morphological characters; and geographical distribution

Interactive effects of stripe rust and plant competition in heterogeneous wheat populations

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