Index Catalog // ScholarsArchive@OSU

Relationship Between Climatic Factors and Distribution of Pratylenchus spp. in the Dryland Wheat-Production Areas of Eastern Washington

Creator:: Kandel, Shyam L., Smiley, Richard W., Garland-Campbell, Kimberly, Elling, Axel A., Abatzoglou, John T., Huggins, David, Rupp, Richard, and Paulitz, Timothy C.
Abstract:: Field surveys were conducted by collecting soil samples to estimate nematode densities in soil from winter wheat, spring wheat, spring barley, and spring legumes (lentil, chickpea, and pea) fields during 2010 and 2011. Pratylenchus spp. were observed in 60% of sampled fields. However, nematodes were detected in nearly all of...
Resource Type:: Article
Full Text:: Agricultural Research Center, Oregon State University, Pendleton 97801; Kimberly Garland-Campbell, United

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:: hop produc- tion in the United States, the Yakima Valley in Eastern Washington and the Willamette

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

Pathogenicity and Virulence of Pythium Species Obtained from Forest Nursery Soils on Douglas-Fir Seedlings

Creator:: Weiland, Jerry E., Beck, Bryan R., and Davis, Anne
Abstract:: Pythium species are common soilborne oomycetes that occur in forest nursery soils throughout the United States. Numerous species have been described from nursery soils. However, with the exception of P. aphanidermatum, P irregulare, P. sylvaticum, and P ultimum, little is known about the potential for other Pythium species found in...
Resource Type:: Article
Full Text:: soilborne pathogens limiting seedling production in the Pacific Northwest (PNW) region of the United States

Sensitivity of Pythium irregulare, P. sylvaticum, and P. ultimum from Forest Nurseries to Mefenoxam and Fosetyl-Al, and Control of Pythium Damping-off

Creator:: Weiland, Jerry E., Santamaria, Luisa, and Grünwald, Niklaus J.
Abstract:: Mefenoxam and fosetyl-Al are common fungicides used to supplement disease control of Pythium damping-off and root rot in forest nurseries of the western United States. However, it is unknown whether fungicide-resistant Pythium isolates are present or whether new fungicide and biological treatments might also provide supplemental disease control. Isolates of...
Resource Type:: Article
Full Text:: and root rot in forest nurseries of the western United States. However, it is unknown whether fungi

Species-Specific PCR Assays for Differentiating Heterodera filipjevi and H. avenae

Creator:: Yan, Guiping, Smiley, Richard W., Okubara, Patricia A., and Skantar, Andrea M.
Abstract:: Heterodera avenae and H. filipjevi are economically important cyst nematodes that restrict production of cereal crops in the Pacific Northwest United States and elsewhere in the world. Identification of these two species is critical for recommending and implementing effective management practices. Primers were designed from the internal transcribed spacer (ITS)...
Resource Type:: Article
Full Text:: , Columbia Basin Agricultural Research Center, Pendleton 97801; Patricia A. Okubara, United States

Developing a Real-Time PCR Assay for Detection and Quantification of Pratylenchus neglectus in Soil

Creator:: Yan, Guiping, Smiley, Richard W., Okubara, Patricia A., Skantar, Andrea M., and Reardon, Catherine L.
Abstract:: Pratylenchus neglectus is one of the most widespread and economically important nematodes that invades plant roots and restricts wheat productivity in the Pacific Northwest. It is challenging to quantify P neglectus using microscopic methods for studies that require large-scale sampling, such as assessment of rotation crops, wheat cultivars, and other...
Resource Type:: Article
Full Text:: A. Okubara, United States Department of Agriculture–Agricultural Research Service (USDA-ARS), Root

SNP-Based Differentiation of Phytophthora infestans Clonal Lineages Using Locked Nucleic Acid Probes and High-Resolution Melt Analysis

Creator:: Hansen, Zachariah R., Knaus, Brian J., Tabima, Javier F., Press, Caroline M., Judelson, Howard S., Grünwald, Niklaus J., and Smart, Christine D.
Abstract:: Phytophthora infestans, the cause of the devastating late blight disease of potato and tomato, exhibits a clonal reproductive lifestyle in North America. Phenotypes such as fungicide sensitivity and host preference are conserved among individuals within clonal lineages, while substantial phenotypic differences can exist between lineages. Whole P. infestans genomes were...
Resource Type:: Article
Full Text:: , United States Department of Agriculture–Agricultural Research Service, (USDA-ARS) Corvallis, OR, 97331

Discovery of Heterodera filipjevi in Washington and comparative virulence with H. avenae on wheat

Creator:: Smiley, Richard W. and Yan, Guiping
Abstract:: The cereal cyst nematode Heterodera avenae suppresses wheat production in the western United States. A second species of cereal cyst nematode, H. filipjevi, was identified in eastern Oregon during 2008. This paper reports the discovery of H. filipjevi–infested fields in eastern Washington, thereby extending the known distribution of H. filipjevi...
Resource Type:: Article
Full Text:: Richard W. Smiley and Guiping Yan1, Oregon State University, Columbia Basin Agricultural Research Center

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

ScholarsArchive@OSU

Relationship Between Climatic Factors and Distribution of Pratylenchus spp. in the Dryland Wheat-Production Areas of Eastern Washington

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

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

Pathogenicity and Virulence of Pythium Species Obtained from Forest Nursery Soils on Douglas-Fir Seedlings

Sensitivity of Pythium irregulare, P. sylvaticum, and P. ultimum from Forest Nurseries to Mefenoxam and Fosetyl-Al, and Control of Pythium Damping-off

Species-Specific PCR Assays for Differentiating Heterodera filipjevi and H. avenae

Developing a Real-Time PCR Assay for Detection and Quantification of Pratylenchus neglectus in Soil

SNP-Based Differentiation of Phytophthora infestans Clonal Lineages Using Locked Nucleic Acid Probes and High-Resolution Melt Analysis

Discovery of Heterodera filipjevi in Washington and comparative virulence with H. avenae on wheat

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

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