Index Catalog // ScholarsArchive@OSU

Relationship of Pratylenchus penetrans (Cobb, 1917) population density and yield of peppermint, Mentha piperita L.

Creator:: Pinkerton, John Nelson
Abstract:: A root-lesion nematode, Pratvlenchus penetrans, was determined to be a major component of peppermint stand decline in Western Oregon. Regression analysis showed that P. penetrans root densities in August were negatively correlated (P=0.01) with yield, while soil densities in August and root and soil densities in April were poorly correlated...
Resource Type:: Dissertation
Full Text:: ) population density and yield of peppermint, Mentha piperita L. AN ABSTRACT OF THE THESIS OF JOHN NELSON

Postemergence herbicides and take-all disease in winter wheat : alterations in the incidence and severity of disease and crop growth

Creator:: Geddens, Ray M.
Abstract:: Eight postemergence herbicides were evaluated to determine their influence on the incidence and severity of take-all disease caused by the fungus Gaeumannomyces graminis var. tritici in winter wheat. Mecoprop ((+)-2-(4-chloro-2-methylphenoxy)propanoic acid), difenzoquat (1,2- dimethyl- 3,5- diphenyl -1H- pyrazolium), dinoseb amine (amine salt of 2-(1-methylpropy1)-4,6-dinitrophenol), and diclofopmethyl (methyl ester of (+)-2-[4-(2,4-dichlorophenoxy)...
Resource Type:: Dissertation
Full Text:: . Estimates of both disease severity on the roots and whitehead incidence followed the logistic rating scale

Pathogenesis and intertree transmission of Verticicladiella wageneri in Douglas-fir (Pseudotsuga menziesii)

Creator:: Hessburg, Paul F.
Abstract:: Verticicladiella wageneri Kendr. is a vascular wilt pathogen of Douglas-fir in the Pacific Northwest, The disease is characterized by black staining of colonized sapwood; crown symptoms are those typical of a wilting syndrome. Histopathological studies revealed that the pathogen is limited to the xylem but causes vascular dysfunction in both...
Resource Type:: Dissertation
Full Text:: inquiry. Paul Hennon, Phil Hamm, Pete Angwin, John Kalafarski, Keith Reynolds and Borys Tkacz - for

Conservation of Rorippa columbiae : an evaluation of reintroduction potential through the study of germination ecology, propagation methods, and habitat requirements

Creator:: Kentnesse, Laura E.
Abstract:: Rare plant reintroductions are a critical conservation tool for the augmentation of diminishing populations, or re-establishment of extirpated populations. Analysis of reintroduction failures suggests that a sophisticated understanding of species biology, ecology, and habitat is essential for producing self-sustaining rare plant populations. This study sought to generate that background knowledge...
Resource Type:: Masters Thesis

Molecular and genetic analyses of genome variability in Ustilago hordei

Creator:: Agnan, Jacqueline
Abstract:: Pulsed-field gel electrophoresis (PFGE) of the strains representing the 14 races of U. hordei, the causal agent of covered smut on barley, revealed extensive polymorphism in chromosome length and number. The purpose of this study was to determine by two approaches the exact chromosome number for each U. hordei race,...
Resource Type:: Dissertation
Full Text:: 68:441-450. Burnett, J. H. 1975. Mycogenetics. John Wiley & Sons Publishers, New York. 375pp

Chloroplast DNA characters, phylogeny, and classification of Lathyrus (Fabaceae)

Creator:: Asmussen, Conny B. and Liston, Aaron
Abstract:: Mapped cpDNA restriction site characters were analyzed cladistically and the resulting phylogenetic hypotheses were used to test monophyly and relationships of the infrageneric classification of Lathyrus (Fabaceae) proposed by Kupicha (1983, Notes from the Royal Botanic Garden Edinburgh 41: 209–244). The validity of previously proposed classification systems and questions presented...
Resource Type:: Article
Full Text:: , and Melissa Luckow for helpful comments on the manuscript and John Wheeler for help in the field and

Response to fenamiphos, extraction techniques and population dynamics of Pratylenchus penetrans on western Oregon red raspberry

Creator:: Lolas, Mauricio
Abstract:: The effects of fenamiphos on soil and root populations of Pratylenchus penetrans were evaluated in four red raspberry cv. Willamette fields in Northwestern Oregon. Field 1 was a silty clay loam with 53% organic matter (OM). Field 2 and 3 were silty loam soils with 3.25 and 2.55% OM, respectively...
Resource Type:: Masters Thesis

The reproductive ecology of the pacific yew (Taxus brevifolia nutt.) under a range of overstory conditions in western Oregon

Creator:: DiFazio, Stephen P.
Abstract:: The influence of overstory openness on the reproductive ecology of Pacific yew (Taxus brevifolia Nutt.) was investigated on 4 sites in western Oregon over 2 years. The breeding system of T. brevifolia was found to deviate from pure dioecy under a broad range of canopy and site conditions. Production of...
Resource Type:: Masters Thesis
Full Text:: caught in turbulent eddies (Whitehead 1983). Sexual Reproduction Breeding System With the

Systematic, genomic, and transcriptomic analysis of mycoparasitic Tolypocladium species and their Elaphomyces hosts

Creator:: Quandt, C. Alisha
Abstract:: Fungi in the genus Tolypocladium are diverse in their host associations, but the predominant ecologies include parasites of the ectomycorrhizal genus Elaphomyces and pathogens of insects. The aim of this dissertation research is to examine the evolution of these fungi and their host associations. To accomplish this several lines of...
Resource Type:: Dissertation

An investigation of vegetation : hydrology interactions in watershed 1 at the H.J. Andrews Experimental Forest

Creator:: Bredensteiner, Kim C.
Abstract:: For management purposes, it would be useful to be able to predict streamflow response to forest practices in small, unmonitored basins. The primary objective of this study is to investigate the influence of early successional vegetation on summer streamflow levels. The long-term data records from watershed 1 at the H.J....
Resource Type:: Masters Thesis

ScholarsArchive@OSU

Relationship of Pratylenchus penetrans (Cobb, 1917) population density and yield of peppermint, Mentha piperita L.

Postemergence herbicides and take-all disease in winter wheat : alterations in the incidence and severity of disease and crop growth

Pathogenesis and intertree transmission of Verticicladiella wageneri in Douglas-fir (Pseudotsuga menziesii)

Conservation of Rorippa columbiae : an evaluation of reintroduction potential through the study of germination ecology, propagation methods, and habitat requirements

Molecular and genetic analyses of genome variability in Ustilago hordei

Chloroplast DNA characters, phylogeny, and classification of Lathyrus (Fabaceae)

Response to fenamiphos, extraction techniques and population dynamics of Pratylenchus penetrans on western Oregon red raspberry

The reproductive ecology of the pacific yew (Taxus brevifolia nutt.) under a range of overstory conditions in western Oregon

Systematic, genomic, and transcriptomic analysis of mycoparasitic Tolypocladium species and their Elaphomyces hosts

An investigation of vegetation : hydrology interactions in watershed 1 at the H.J. Andrews Experimental Forest

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