Index Catalog // ScholarsArchive@OSU

Internal transcribed spacer region evolution in Larix and Pseudotsuga (Pinaceae)

Creator:: Gernandt, David S. and Liston, Aaron
Abstract:: The nuclear ribosomal DNA (nrDNA) internal transcribed spacer (ITS) region has been characterized in the sister genera Larix and Pseudotsuga (Pinaceae). Complete sequences were obtained for seven species of Larix from North America and Eurasia and five species of Pseudotsuga from western North America and eastern Asia. ITS region lengths...
Resource Type:: Article
Full Text:: –723. 1999. INTERNAL TRANSCRIBED SPACER REGION EVOLUTION IN LARIX AND PSEUDOTSUGA (PINACEAE)1 DAVID S

Concepts of Sustainability, Motivations for Pest Management Approaches, and Implications for Communicating Change

Creator:: Sherman, Jennifer and Gent, David H.
Abstract:: Impact and relevance are valued by both plant pathologists and the supporters of research and extension. Impact has been characterized as the “So what?” of research results, and in applied research in agriculture typically involves some change in human behavior. This might involve, for instance, avoidance of broad spectrum pesticides,...
Resource Type:: Article
Full Text:: - Corresponding author: David H. Gent, U.S. Department of Agriculture- Agricultural Research Service, Forage Seed

Orbilia ultrastructure, character evolution and phylogeny of Pezizomycotina

Creator:: Kumar, T.K. Arun, Healy, Rosanne, Spatafora, Joseph W., Blackwell, Meredith, and McLaughlin, David J.
Abstract:: Molecular phylogenctic analyses indicate that the monophyletic classes Orbiliomycetes and Pezizomycetes are among the earliest diverging branches of Pezizomycotina, the largest subphylum of the Ascomycota. Although Orbiliomycetes is resolved as the most basal lineage in some analyses, molecular support for the node resolving the relationships between the two classes is...
Resource Type:: Article
Full Text:: Rouge, Louisiana 70803 David J. McLaughlin Department of Plant Biology, University of Minnesota, St

Annual cycles of ecological disturbance and recovery underlying the subarctic Atlantic spring plankton bloom

Creator:: Behrenfeld, Michael J., Doney, Scott C., Lima, Ivan, Boss, Emmanuel S., and Siegel, David A.
Abstract:: Satellite measurements allow global assessments of phytoplankton concentrations and, from observed temporal changes in biomass, direct access to net biomass accumulation rates (r). For the subarctic Atlantic basin, analysis of annual cycles in r reveals that initiation of the annual blooming phase does not occur in spring after stratification surpasses...
Resource Type:: Article
Full Text:: recovery underlying the subarctic Atlantic spring plankton bloom Michael J. Behrenfeld,1 Scott C. Doney,2

Susceptibility of Hop Crown Buds to Powdery Mildew and its Relation to Perennation of Podosphaera macularis

Creator:: Gent, David H., Claassen, Briana J., Twomey, Megan C., Wolfenbarger, Sierra N., and Woods, Joanna L.
Abstract:: In the Pacific Northwestern United States, the hop powdery mildew fungus, Podosphaera macularis, survives overwintering periods in association with living host tissue because the ascigerious stage of the pathogen is not known to occur in this region. Field experiments were conducted over a 5-year period to describe the overwintering process...
Resource Type:: Article
Full Text:: its Relation to Perennation of Podosphaera macularis David H. Gent,† United States Department of

Population Density and Phenology of Tetranychus urticae (Acari: Tetranychidae) in Hop is Linked to the Timing of Sulfur Applications

Creator:: Woods, J. L., Dreves, A. J., Fisher, Glenn C., James, David G., Wright, Larry C., and Gent, D. H.
Abstract:: The twospotted spider mite, Tetranychus urticae Koch, is a worldwide pest of numerous agronomic and horticultural plants. Sulfur fungicides are known to induce outbreaks of this pest on several crops, although mechanisms associated with sulfur-induced mite outbreaks are largely unknown. Studies were conducted during 2007–2009 in Oregon and Washington hop...
Resource Type:: Article
Full Text:: urticae (Acari: Tetranychidae) in Hop is Linked to the Timing of Sulfur Applications J. L. WOODS,1 A. J

Burial increases seed longevity of two Artemisia tridentata (Asteraceae) subspecies

Creator:: Wijayratne, Upekala C. and Pyke, David A.
Abstract:: • Premise of the study: Seed longevity and persistence in soil seed banks may be especially important for population persistence in ecosystems where opportunities for seedling establishment and disturbance are unpredictable. The fire regime, an important driver of population dynamics in sagebrush steppe ecosystems, has been altered by exotic annual...
Resource Type:: Article
Full Text:: fi nding sites, S. Akagi and D. Bilsland for laboratory assistance, J. Brunson, N. DeCrappeo, E

Fire and Grazing Influence Site Resistance to Bromus tectorum Through Their Effects on Shrub, Bunchgrass and Biocrust Communities in the Great Basin (USA)

Creator:: Condon, Lea A. and Pyke, David A.
Abstract:: Shrubs, bunchgrasses and biological soil crusts (biocrusts) are believed to contribute to site resistance to plant invasions in the presence of cattle grazing. Although fire is a concomitant disturbance with grazing, little is known regarding their combined impacts on invasion resistance. We are the first to date to test the...
Resource Type:: Article
Full Text:: on Shrub, Bunchgrass and Biocrust Communities in the Great Basin (USA) Lea A. Condon1,2* and David

Abandoning Sverdrup’s critical depth hypothesis on phytoplankton blooms

Creator:: Behrenfeld, Michael J.
Abstract:: The Critical Depth Hypothesis formalized by Sverdrup in 1953 posits that vernal phytoplankton blooms occur when surface mixing shoals to a depth shallower than a critical depth horizon defining the point where phytoplankton growth exceeds losses. This hypothesis has since served as a cornerstone in plankton ecology and reﬂects the...
Resource Type:: Article
Full Text:: phytoplankton blooms MICHAEL J. BEHRENFELD1 Department of Botany and Plant Pathology, Cordley Hall 2082

Meta-Analysis Reveals a Critical Period for Management of Powdery Mildew on Hop Cones

Creator:: Nelson, Mark E., Gent, David H., and Grove, Gary G.
Abstract:: Results of 28 field trials conducted over a 12-year period investigating management of hop powdery mildew caused by Podosphaera macularis were quantitatively summarized by meta-analysis to compare product efficacy and use patterns by mode of action as defined by Fungicide Resistance Action Committee (FRAC) groups. Availability of original observations enabled...
Resource Type:: Article
Full Text:: , Prosser, 99350; David H. Gent, United States Department of Agriculture–Agricultural Research Service

ScholarsArchive@OSU

Internal transcribed spacer region evolution in Larix and Pseudotsuga (Pinaceae)

Concepts of Sustainability, Motivations for Pest Management Approaches, and Implications for Communicating Change

Orbilia ultrastructure, character evolution and phylogeny of Pezizomycotina

Annual cycles of ecological disturbance and recovery underlying the subarctic Atlantic spring plankton bloom

Susceptibility of Hop Crown Buds to Powdery Mildew and its Relation to Perennation of Podosphaera macularis

Population Density and Phenology of Tetranychus urticae (Acari: Tetranychidae) in Hop is Linked to the Timing of Sulfur Applications

Burial increases seed longevity of two Artemisia tridentata (Asteraceae) subspecies

Fire and Grazing Influence Site Resistance to Bromus tectorum Through Their Effects on Shrub, Bunchgrass and Biocrust Communities in the Great Basin (USA)

Abandoning Sverdrup’s critical depth hypothesis on phytoplankton blooms

Meta-Analysis Reveals a Critical Period for Management of Powdery Mildew on Hop Cones

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