Index Catalog // ScholarsArchive@OSU

Heat as a factor in germination of seeds of Ceanothus velutinus var. laevigatus T. & G.

Creator:: Gratkowski, H.
Resource Type:: Dissertation
Full Text:: VBLUTINPS VAR. LAEVIGATtJS T. & G. by HENRY JOHN GRATKOWSKI A THESIS submitted to OREGON STATE UNI

Taxonomic studies of the Eucephalus complex of Aster in the Pacific Northwest

Creator:: Thompson, Dennis Dean
Resource Type:: Masters Thesis
Full Text:: Upper leaf surface R Lower leaf surface S Leaf texture T Leaf shape U Leaf length V Leaf base shape W

Ecotypic adaptation of Setaria lutescens (Weigel) F. T. Hubbard to alfalfa culture in California

Creator:: Schoner, Carl Arnold
Abstract:: Setaria lutescens (yellow foxtail) plants, grown from five seed sources were compared in California. Seed sources were: Connecticut, Iowa, Massachusetts, Pennsylvania and California. Morphological and physiological differences between biotypes include: plant size, growth habit, time required to mature and reproductive capa city. Most significant is the prostrate habit of the...
Resource Type:: Dissertation
Full Text:: July 31, 1974 (Major Dept.) (Date) Title ECOTYPIC ADAPTATION OF SETARIA LUTESCENS (WEIGEL) F. T

A systematic study of Lathyrus vestitus Nutt. ex T. & G. (Fabaceae) and allied species of the Pacific Coast

Creator:: Broich, Steven L.
Abstract:: Eight species of Lathvrus (Fabaceae, Faboideae) endemic to the Pacific Coast of North America were the subject of a systematic investigation. Taxa studied included Lathvrus vestitus, Nutt. ex T. & G., L. laetif lorus Greene, L.. iepsonii Greene, £,. splendens Kellogg, L. polvphvllus, Nutt. ex T. & G., L. holochlorus...
Resource Type:: Dissertation
Full Text:: A systematic study of Lathyrus vestitus Nutt. ex T. & G

The phytoplankton and limnological characteristics of Lago Rupanco, Osorno, Chile

Creator:: Donoso, Teresa G.
Abstract:: Lago Rupanco is located in the central plain of Chile (Borgel, 1964) at 40° 50' S; 72° 30' W. It lies at 117 m above sea level, and corresponds to type 28c of Hutchinson's (1967) classification. Lago Rupanco is a warm, monomictic lake, with winter circulation and summer stratification. Physical,...
Resource Type:: Masters Thesis
Full Text:: '. Phinney Lago Rupanco is located in the central plain of Chile (Borgel, 1964) at 40° 50' S; 72° 30' W. It

Influence of atmospheric humidity on sporulation of Sphaerotheca pannosa (Wallr.) Lev. var. rosae Wor.

Creator:: Hural, Kirsten
Abstract:: The influence of atmospheric humidity on three aspects of sporulation of Sphaerotheca pannosa (Wallr.) Lev. var. rosae Wor., which causes rose powdery mildew, was studied on leaf disks of susceptible Rosa cultivar Samantha. To study conidiophore production, leaf disks were inoculated on the adaxial (upper) surface with conidia of S....
Resource Type:: Masters Thesis
Full Text:: professor Peter Bottom ley, Ron Cameron, and Maxine Thompson. A special thank-you must go to Chuck Leach

Ozone flux in Helianthus annuus (L.)

Creator:: Smith, Elaine D.
Abstract:: Sunflower (Helianthus annuus L., cv. NK894) seedlings, grown hydroponically, were exposed to ozone concentrations of 0.0, 0.1, 0.2, and 0.3 ppm at 60% RH, or 0.0 and 0.3 ppm at 30% and 90% RH, for 6 h/d, for four consecutive days, at ages 15 to 18 days from seeding. Plant...
Resource Type:: Masters Thesis
Full Text:: Privacy David T. T44kei Sunflower (Helianthus annuus L., cv. NK894) seed- lings, grown hydroponically

Systematics of the genus Otidea in the Pacific Northwest

Creator:: Peterson, Eric T.
Abstract:: The fungal ascomycete genus Otidea as represented in the Pacific Northwest of North America includes eight well known species and two poorly-known species. Cladistic analysis utilizing characters from ribosomal DNA and morphology allowed the development of a robust phylogenetic species concept for Otidea. The combination of characters from the ribosomal...
Resource Type:: Masters Thesis
Full Text:: . Vilgalys, S. M. Barns, D. Gonzales, D. S. Hibbert, D. J. Lane, L. Simon, S. Stickel, T. M. Szaro, W. G

Patterns in coastal marsh vegetation of the Juneau area, Alaska

Creator:: Stone, Catherine S.
Abstract:: A vegetation study was made of four coastal marshes near Juneau, Alaska. Results confirmed earlier studies' findings in southeast Alaska that communities or assemblages of species can be identified but from marsh to marsh these assemblages appear to have no consistent relationship to each other or to environmental "factors" such...
Resource Type:: Dissertation
Full Text:: 1- to., cn rr a)w o w 1-t n o rr 1-6 I-k fD 0 D3 fY 5 CD [diagram mine] 19 20 The reason

Investigation of the oxidizing side of photosystem II through mutant analysis

Creator:: Metz, James George
Resource Type:: Dissertation
Full Text:: of my graduate committee (Drs. Ralph Quatrano, Donald Armstrong, Donald Reed, and Maxine Thompson

Secondary Metabolism in Tolypocladium : Characterization, Ecology, Evolution and Regulation

Creator:: Blount, Rheannon Rua
Abstract:: An increased understanding of secondary metabolism in fungi is important for both biological and societal reasons. The ascomycete genus, Tolypocladium, is an ideal system to explore secondary metabolism characterization, ecology, evolution and regulation. The genus produces and has the genomic potential to produce a wide array of metabolites. Paired with...
Resource Type:: Dissertation
Full Text:: : ___________________________________________________ Joseph W. Spatafora An increased understanding of secondary metabolism in fungi is

Cryptogam communities in forest and steppe ecosystems of Oregon, USA

Creator:: Root, Heather T.
Abstract:: I focus on addressing knowledge gaps relating to management of cryptogams in Oregon's public lands in Pseudotsuga menziesii-Tsuga heterophylla forests on the west side of the Cascade Range and dryland steppe in the Cascade Range's rainshadow. While a great deal of research has illustrated the importance of late-successional forests for...
Resource Type:: Dissertation
Full Text:: DISSERTATION OF Heather T Root for the degree of Doctor of Philosophy in Botany and Plant Pathology

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
Full Text:: and early access to data collected for T. inflatum. Chapter 4: Joseph W. Spatafora helped design

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:: Day River J. & T.J. Howell 1882 John Day River near its mouth T. Howell 1882 John Day River at

Some cytological aspects of streak mottle virus in Lilium speciosum Thunberg

Creator:: Elser, John Elmore
Abstract:: Cultivated lilies include many garden varieties in addition to the Easter lily, Lilium longiflorum Thunb. A popular member of the garden group is Lilium speciosum Thunb., whose leaves can be discolored by a virus symptom described as streak mottle. This disorder is characterized by dashes of chlorotic tissue interspersed with...
Resource Type:: Masters Thesis
Full Text:: . and T. W. Carroll. 1967. Electron microscopy of wheat streak mosaic virus particles in infected plant

Examination of necrotic fleck-diseased Lilium longiflorum

Creator:: Lyons, Alan Robert
Resource Type:: Masters Thesis
Full Text:: LONGIFLORUM Abstract approved: Redacted for privacy T, C. Allen, Jr. Previous research has provided

Community Ecology and Population Genomics of Rhizopogon in the Madrean Sky Island Archipelago

Creator:: Piña Páez, Carolina G.
Abstract:: Anthropogenic induced climate change is predicted to alter distribution of existing plant populations. As plants migrate over space and time, populations often fragment and contract, affecting basic elements of population dynamics (e.g., population size, gene flow, genetic diversity, etc.). Little is known, however, how these impacts on plant species will...
Resource Type:: Dissertation
Full Text:: . Abstract approved: ______________________________________________________ Joseph W. Spatafora

Description of the plant communities and succession of the Oregon coast grasslands

Creator:: Ripley, James Douglas
Abstract:: In an effort to describe the plant communities and succession of the Oregon coastal grasslands, vegetation and environmental data were collected from 75 stands at 24 separate locations ranging from Cape Falcon in Tillamook County to Cape Ferrelo in Curry County. The vegetation data consisted of cover and frequency values...
Resource Type:: Dissertation
Full Text:: approved: William W. Chilcote In an effort to describe the plant communities and succession of the

Plant communities of the grassy balds of Marys Peak, Oregon

Creator:: Snow, Billy Douglas
Resource Type:: Masters Thesis
Full Text:: Peak Quadrangles, Oregon (U.S. Geological Survey Map, 1956). :1?; - - j I / I \ =- , - - r .r ''t

Studies on inhibitory compounds produced by Agrobacterium radiobacter strain 84

Creator:: Staver, Michael J.
Abstract:: A study was made of compounds produced by Agrobacterium radiobacter strain 84 that are inhibitory to some pathogenic strains of A. tumefaciens. Agrocins (inhibitory compounds) were partially purified from large volumes of A. radiobacter strain 84 culture supernatants to determine (i) if more than one agrocin is produced, (ii) if...
Resource Type:: Masters Thesis
Full Text:: Compounds Produced by Agrobacterium radiobacter Strain 84 Abstract Approved: Redacted for Privacy Larry W

Systematics and phylogeny of Cordyceps and the Clavicipitaceae with emphasis on the evolution of host affiliation

Creator:: Sung, Gi-Ho
Abstract:: Cordyceps is a genus of perithecial ascomycetes. It includes over 400 species that are pathogens of arthropods and parasites of the truffle genus Elaphomyces. Based on the morphology of cylindrical asci, thickened ascus apices and filiform ascospores, it is classified in the Clavicipitaceae (Hypocreales), which also includes endophytes and epiphytes...
Resource Type:: Dissertation
Full Text:: . Glenn, A. E., C. W. Bacon, R. Price, and R. T. Hanlin. 1996. Molecular phylogeny of Acremonium and its

A survey of Agrobacterium strains associated with Georgia pecan trees and an immunological study of the bacterium

Creator:: Bouzar, Hacène
Abstract:: Crown gall was found in numerous pecan orchards in Georgia. In some instances, 60% of the trees were diseased. Galled trees were less vigorous than noninfected trees. Among the pathogenic Agrobacterium strains isolated from 18 galled trees from six counties, biovar 1 strains predominated and most were sensitive to agrocin...
Resource Type:: Masters Thesis
Full Text:: BACTERIUM Abstract approved: Redacted for Privacy Larry W. Moore Crown gall was found in numerous pecan

Description and classification of the forests of the upper Illinois River drainage of Southwestern Oregon

Creator:: Atzet, Thomas
Abstract:: The purpose of this study was to develope a plant community classification within the Siskiyou mountains, a small range within the Klamath geological province well known for its geologic and floristic diversity. Forest land managers have expressed the need for identification of basic Land classes that will aid in the...
Resource Type:: Dissertation
Full Text:: : "illiam W. Chilcote The purpose of this study was to develope a plant community classifi- cation within

Synecology of the white-oak (Quercus garryana Douglas) woodlands of the Willamette Valley, Oregon

Creator:: Thilenius, John F., 1931-
Abstract:: Quercus garryana dominated plant communities are found in the interior coastal valleys and on foothills from southeastern Vancouver Island, British Columbia, south to San Francisco, California. They occur as savannas, intermixed with a variety of conifers, and in almost pure stands. The diversity of habitats occupied by the species and...
Resource Type:: Dissertation
Full Text:: Graduate Schoo Date thesis is presented Typed by Illa W. Atwood ACKNOWLEDGEMENTS The author

The location, composition, and structure of old-growth forests of the Oregon coast range

Creator:: Juday, Glenn Patrick
Resource Type:: Dissertation
Full Text:: 0) Z NI u 0 pa CI 4-I t--1 CN 3 Cn (/) A >, a a, CZ1 $4 1.1 0 MZ 1 W G 0. d E W W X N a) 5 A

Systematics, phylogeny, and biogeography of the hysterangiales and related taxa (Phallomycetidae, Homobasidiomycetes)

Creator:: Hosaka, Kentaro
Abstract:: Monophyly of the gomphoid-phalloid clade was confirmed based on multigene phylogenetic analyses. Four major subclades (Hysterangiales, Geastrales, Gomphales and Phallales) were also demonstrated to be monophyletic. The interrelationships among the subclades were, however, not resolved, and alternative topologies could not be rejected statistically. Nonetheless, most analyses showed that the Hysterangiales...
Resource Type:: Dissertation
Full Text:: . M. Barns, D. Gonzales, D. S. Hibbett, D. J. Lane, L. Simon, S. Stickel, T. M. Szaro, W. G. Weisburg

Serological identification of common and strain-specific antigens in Agrobacterium

Creator:: Bouzar, Hacene
Abstract:: Two new methods, one of broad specificity and the other of narrow specificity, were developed for the identification of agrobacteria. The former method was based on ribosomal antigens that were common to members of the closely related Agrobacterium and Rhizobium genera. Antisera to unwashed 50 S ribosomal subunits from five...
Resource Type:: Dissertation
Full Text:: Privacy 4arry W. Moore Two new methods, one of broad specificity and the other of narrow specificity

Symbiosis in the Pacific Ring of Fire : evolutionary-biology of Rhizopogon subgenus Villosuli as mutualists of Pseudotsuga

Creator:: Mujic, Alija Bajro
Abstract:: Rhizopogon is a large genus of ectomycorrhizal (EM) fungi that grows in association with host trees of the family Pinaceae. We have conducted a series of studies investigating the ecology and evolutionary biology of the EM symbiosis shared between R. subgenus Villosuli and trees of the genus Pseudotsuga. Two members...
Resource Type:: Dissertation
Full Text:: : ______________________________________________________ Joseph W. Spatafora Rhizopogon is a large genus of ectomycorrhizal (EM) fungi that grows in

Copper and streptomycin resistance in Pseudomonas syringae isolated from Pacific Northwest nurseries

Creator:: Scheck, Heather J.
Resource Type:: Dissertation
Full Text:: : ay W. Pscheidt ABSTRACT Losses from diseases caused by the phytopathogenic bacterium Pseudomonas

Plant communities and succession in Oregon coastal salt marshes

Creator:: Jefferson, Carol A.
Abstract:: The purpose of this study was to determine plant species composition, community structure, successional relationships, vegetational development and plant distributions in estuarine salt marshes on the Pacific Coast of Oregon. Quadrat and transect samples of plant presence and cover, collected from April 1971 - June 1974, were subjected to phytosociological...
Resource Type:: Dissertation
Full Text:: approved byf~t%;r William W. Chilcote r The purpose of this study was to determine plant species com

Identification and Occurrence of Sweet Cherry (Prunus avium) Virus and Virus-Like Diseases in Various Regions and Orchards of Oregon

Creator:: Reinhold, Lauri A.
Abstract:: There are over 35 known virus and virus-like diseases of sweet cherry (Prunus avium), some with potential to cause severe economic impact by reducing vegetative growth, vigor, and/or quality of fruit. Oregon is the second-ranked state for sweet cherry production in the United States with 13,000 acres and $70.8 million...
Resource Type:: Dissertation
Full Text:: Fruit Research Commission. Hadidi, A., Barba, M., Candresse, T. and Jelkmann, W. 2011. Virus and

An ecological study of the vegetation of the Bear River Migratory Bird Refuge, Box Elder County, Utah

Creator:: Kaltwasser, Robert George
Abstract:: During the summers of 1971, 1972, and 1973, a general floristic ecological survey of the naturally-occurring vegetation of the Bear River Migratory Bird Refuge in Utah was carried out. Ten community types were identified and characterized. These included two aquatic communities, the Potamogeton pectinatus (Pope) and the Ruppia maritima/ Zannichellia...
Resource Type:: Masters Thesis
Full Text:: Redacted for Privacy Abstract approved William W. aiiCote During the summers of 1971, 1972, and 1973, a

Permineralized Mesozoic Moss Gametophytes and their Implications for Bryophyte Evolution

Creator:: Bippus, Alexander C.
Abstract:: Mosses (Phylum Bryophyta) are widely considered to be among the most ancient groups of land plants (embryophytes) and they are the second most speciose embryophyte phylum with ~13,000 extant species. Despite their diversity and antiquity, mosses have a limited fossil record, which primarily consists of gametophytes entombed in Cenozoic amber....
Resource Type:: Dissertation
Full Text:: Gar W. Rothwell Mosses (Phylum Bryophyta) are widely considered to be among the most

Pyrenophora tritici-repentis : investigation of factors that contribute to pathogenicity

Creator:: Holman, Thomas W.
Abstract:: Pyrenophora tritici-repentis (Ptr) is the necrotrophic fungus responsible for tan spot of wheat (Triticum aestivum). Ptr causes disease on susceptible wheat cultivars through the production and secretion of host-selective toxins (HSTs). HSTs are compounds that are only known to be produced by fungi and considered to be primary determinants of...
Resource Type:: Masters Thesis
Full Text:: AN ABSTRACT OF THE THESIS OF Thomas W

Comparative gibberellin relationships in tall and dwarf peas (Pisum sativum L.)

Creator:: Anderson, James David
Abstract:: Experiments were performed to determine whether a direct correlation exists between the growth rates of tall and dwarf peas grown either in the light or in the dark and endogenous gibberellin (GA) content. Three separate but related experimental approaches were utilized: (1) the determination of possible qualitative and /or quantitative...
Resource Type:: Dissertation
Full Text:: . Appreciation is also expressed to Drs. N. I. Bishop, W. D. Loomis and A. W. Anderson for serving on my

Distribution of understory species in relation to maximum and minimum tree influence in the montane forest of the Central Oregon Cascades

Creator:: Robinson, Andrew Frederick, Jr.
Abstract:: Twenty sites of uniform topography and soil were select ed in the montane forest found on the East flank of the Central Oregon Cascades. These sites were located along a vegetational gradient composed of five plant communities: Abies/Pachistima, Pinus/Ceanothus, Pinus Arctostaphylos-Purshia, Pinus/Purshia/Festuca, and Juniperus Festuca. An attempt was made to...
Resource Type:: Dissertation
Full Text:: THE CENTRAL OREGON CASCADES Abstract approved: Redacted for Privacy W. W. Chilcote Twenty sites of

An analysis of montane forest vegetation on the east flank of the central Oregon Cascades

Creator:: West, Neil E.
Abstract:: Montane forest vegetation as it occurs on the east flank of the central Oregon Cascades has provided excellent conditions for a "natural experiment" in the use of various methodologies in studying vegetational distribution. This "experiment" has reflected on some theory and practice for the discipline of plant synecology. Detailed descriptions,...
Resource Type:: Dissertation
Full Text:: ) Circle denotes study area 6 "0 w t` e.....; ti# 1« ," : 1 3 7 3 -'. "EPSON ..a

Soil moisture depletion trends under five plant species present on the Douglas-fir clear-cuts of Mary's Peak, Oregon

Creator:: Drew, Stephen Ernest
Abstract:: Soil moisture depletion trends under five plant species growing on the clear-cuts of the Marys Peak Watershed near Corvallis, Oregon, were followed during the summers of 1963 and 1964. The species were Holcus lanatus, Lotus crassifolius var. subglaber, Gaultheria shallon, Berberis nervosa, and Acer circinatum; and were dominant plants of...
Resource Type:: Masters Thesis
Full Text:: O N ( A T M . ) 20.0 10.0 9.0 9.0 7.0 2' 6.0 F- a 5.0 z o 4.0 3.0 z W F

Growth and replacement patterns occuring among selected dominant species associated with plant succession on Douglas fir clear-cuts

Creator:: Robinson, Myles Canby
Abstract:: Growth and replacement patterns of four successionally important species occurring on Douglas fir clear-cuts were investigated from September 1964 to June 1967. The study was carried out on the Marys Peak watershed located near Corvallis, Oregon. Species used in the study include Holcus lanatus, Senecio jacobaea, Lotus crassifolius var. subglaber,...
Resource Type:: Dissertation
Full Text:: Holcus, Senecio, and Lotus frorn Sept. tg64 t;m LT Average percentage of Holcus rernaining on transects

Spatial and chronological patterns of Purshia tridentata as influenced by Pinus ponderosa overstory

Creator:: Sherman, Robert James
Abstract:: Twelve sites of uniform topography and soils were selected in the Pinus ponderosa/Purshia tridentata/Festuca idahoensis Association. These sites were located in the rain shadow on the east flank of the Oregon Cascades. A fire history in the form of fire scars on ponderosa pine was available for nine of these...
Resource Type:: Masters Thesis
Full Text:: 1! .y. ( , I , t. " V t , ' q ', 4 li ... ...* 44,w %-4t. - 4 grIffi *4.-44.1.-'44

Fire history of the ponderosa pine forests of the Warm Springs Indian Reservation, Oregon

Creator:: Soeriaatmadja, Roehajat Emon, 1936-
Abstract:: Fire has played a prominent role in the development and character of the ponderosa pine forests in western North American. Its records are written in the scars of trees that have survived the fire. Careful studies of these fire-scars may be used as a means of reconstructing the fire history...
Resource Type:: Dissertation
Full Text:: gratitude to my major professor, Dr. W. W. Chilcote for his constant advice and encouragement during the

Contributions to the plant ecology of the Oregon coastal sand dunes

Creator:: Wiedemann, Alfred M.
Abstract:: Sand dunes are found along the coasts of most of the large land masses of the world. Because of their proximity to man and his activities, the maritime sand dunes of Europe, particularly Germany, France, Holland and Scandinavia, have the longest history of stabilization activities and botanical investigation. There are...
Resource Type:: Dissertation
Full Text:: which this thesis is based. Special appreciation is expressed to the author's major profes- sor, Dr. W

Lichen distribution in Oregon coastal dune communities

Creator:: Leuthner, Shirley Mae
Abstract:: Distribution of lichens was studied at seven coastal dune sites in Oregon. Lichens were sampled in the dry stable, dry meadow, meadow, rush meadow, marsh, shrub and forest deflation plain communities. Observations were made of the standing water in the marsh community. Quantitative measurements were made of the percent organic...
Resource Type:: Masters Thesis
Full Text:: DUNE COMMUNITIES Abstract approved: Redacted for privacy W. W. Chilcote Distribution of lichens was

Revegetation in the 1914-1915 devastated area of Lassen Volcanic National Park

Creator:: Bailey, Warren Hutchinson, 1914-
Abstract:: At the time of the eruptions of Lassen Peak in 1914-1915, an area of vegetation along the east slope of the mountain approximately 1 1/4 miles wide and four miles long was destroyed. Except for a few surviving trees, all vegetation was destroyed. A study of the revegetation of this...
Resource Type:: Dissertation
Full Text:: preparation of this dissertation. Most of all, thanks should go to Dr. W. W. Chilcote, Associate Professor

Irrigated crop research in Oregon's Columbia Basin : 1981 research report

Creator:: Oregon State University. Agricultural Experiment Station and Columbia Basin Agricultural Research Center
Abstract:: Published July 1981. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Resource Type:: Technical Report
Full Text:: Data - Columbia Basin Agriculture Research and Extension Center, Hermiston, Oregon AUTHORS 1. T

Phenotypic Plasticity of the Hydrasperman Seed Fern Tetrastichia bupatides Gordon (Lyginopteridaceae)

Creator:: Dunn, Michael T. and Rothwell, Gar W.
Abstract:: Fifty-nine stems of Tetrastichia bupatides, numerous frond segments, and roots from Oxroad Bay, Scotland, have recently been analyzed. They reveal that many characters originally used to describe this species exhibit a wider range of variation than previously suspected. These data suggest that ribs of the protostele are most commonly four...
Resource Type:: Article
Full Text:: FERN TETRASTICHIA BUPATIDES GORDON (LYGINOPTERIDACEAE) Michael T. Dunn1,* and Gar W. Rothwelly

Effects of the Mycoparasite Sphaerellopsis filum on Overwintering Survival of Stem Rust in Perennial Ryegrass

Creator:: Gordon, T. C. and Pfender, W. F.
Abstract:: Sphaerellopsis filum is a mycoparasite of Puccinia graminis subsp. graminicola, a rust fungus that causes widespread crop damage on perennial ryegrass grown for seed. In observations taken over the winter months, S. filum was found naturally colonizing 2% of P. graminis subsp. graminicola uredinia on first-year plantings and 25% of...
Resource Type:: Article
Full Text:: Mycoparasite Sphaerellopsis filum on Overwintering Survival of Stem Rust in Perennial Ryegrass T. C. Gordon

Taxonomy and host specificity of the genus Agrobacterium

Creator:: Anderson, Arthur Robert
Abstract:: One hundred seventy-eight Agrobacterium isolates, 120 United States (U.S.), 26 Australian and 32 of miscellaneous origin, were characterized for their reactions to 20 biochemical and physiological tests. Isolate pathogenicity and degree of host specificity, utilization of nopaline and octopine, and sensitivity to agrocin-84 also were determined. The U.S. isolates were...
Resource Type:: Dissertation
Full Text:: GENUS AGROBACTER.IUM Redacted for privacyAbstract approved: 1. Larry W. Moore Redacted for privacy

Suppression of take-all [Gaeumannomyces graminis (Sacc.) Arx & Olivier var. tritici Walker] of wheat (Triticum aestivum L.) by banded ammonium and chloride fertilizers

Creator:: Halsey, Mark Evan
Resource Type:: Dissertation
Full Text:: soil incorporated into treated soil (1% w/w) or banded in the seed furrow in methyl bromide fumigated

Ecology and biological control of an apomictic invasive plant, Chondrilla juncea (Asteraceae)

Creator:: Campanella, Donald M.
Abstract:: A study consisting of three parts was undertaken to investigate how variation in species interactions, population genetic structure, epidemiological parameters, and plant breeding system may influence the ecology and biological control of an apomictic invasive plant, Chondrilla juncea (Asteraceae). Interactions between natural enemy species may modify their net effect on...
Resource Type:: Dissertation
Full Text:: State University (Corvallis, Oregon, 44° 34’ N, 123° 17’ W), located about 125 km from the nearest

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