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Filtering by: Publisher The Oceanography Society Remove constraint Publisher: The Oceanography Society Academic Affiliation Botany and Plant Pathology Remove constraint Academic Affiliation: Botany and Plant Pathology Rights Statement Copyright Not Evaluated Remove constraint Rights Statement: Copyright Not Evaluated

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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...

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reprinted with customary crediting of the source. The American Phytopatho- logical Society, 2013. Plant
Sclerotinia Wilt of Hop (Humulus lupulus) Caused by Sclerotinia sclerotiorum in the Pacific Northwest United States

Creator:

Kropf, S. M., Putnam, M. L., Serdani, M., Twomey, M. C., Woods, J. L., and Gent, D. H.

Abstract:

In June 2009, wilted hop bines were observed in a yard in Marion County, OR. The wilt was associated with a stem rot that occurred ∽1 m from the ground near the point where bines are tied together for horticultural purposes. Samples of affected stems were submitted to the Oregon...

Resource Type:

Article
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...

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customary crediting of the source. The American Phytopatho- logical Society, 2012. 1472 Plant Disease
Association of Spring Pruning Practices with Severity of Powdery Mildew and Downy Mildew on Hop

Creator:

Gent, David H., Nelson, Mark E., Grove, Gary G., Mahaffee, Walter F., Turechek, William W., and Woods, Joanna L.

Abstract:

Downy mildew (caused by Pseudoperonospora humuli) and powdery mildew (caused by Podosphaera macularis) are important diseases of hop in the Pacific Northwest United States, and cultural practices may affect the severity of both diseases. The association of spring pruning quality and timing with severity of downy mildew and powdery mildew...

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be freely reprinted with customary crediting of the source. The American Phytopatho- logical Society
Comparison of Meldola’s Blue Staining and Hatching Assay with Potato Root Diffusate for Assessment of Globodera sp. Egg Viability

Creator:

Kroese, Duncan, Zasada, Inga A., and Ingham, Russell E.

Abstract:

Laboratory-based methods to test egg viability include staining with Meldola's Blue and/or juvenile (J2) hatching assays using potato root diffusate (PRD). These two methods have not been tested under identical conditions to directly compare their assessments of Globodera egg viability. Using two bioassay strategies, cysts from a Glabodera sp. population...

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. � The Society of Nematologists 2011. Comparison of Meldola’s Blue Staining and Hatching Assay with
Phytophthora ramorum colonizes tanoak xylem and is associated with reduced stem water transport

Creator:

Parke, J. L., Oh, E., Voelker, S., Hansen, E. M., Buckles, G., and Lachenbruch, Barbara

Abstract:

Isolation, detection with diagnostic polymerase chain reaction (PCR), and microscopy demonstrated the presence of Phytophthora ramorum in the sapwood of mature, naturally infected tanoak (Lithocarpus densiflorus) trees. The pathogen was strongly associated with discolored sapwood (P < 0.001), and was recovered or detected from 83% of discolored sapwood tissue samples....

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published by The American Phytopathological Society For more information on this and other
Within-population genetic structure differs between two sympatric sister-species of ectomycorrhizal fungi, Rhizopogon vinicolor and R. vesiculosus

Creator:

Dunham, Susie M., Mujic, Alija Bajro, Spatafora, Joseph W., and Kretzer, Annette M.

Abstract:

Using spatial autocorrelation analysis, we examined the within-population genetic structure of Rhizopogon vinicolor and R. vesiculosus, two hypogeous ectomycorrhizal (EM) species that are sympatric sister taxa known to differ in their clonal structure. We collected 121 sporocarps and 482 tuberculate EM of both species from a 20 ha forest stand...

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Mycologia, 105(4), 2013, pp. 814–826. DOI: 10.3852/12-265 # 2013 by The Mycological Society of America
Phytophthora borealis and Phytophthora riparia, new species in Phytophthora ITS Clade 6

Creator:

Hansen, Everett M., Reeser, Paul W., and Sutton, Wendy

Abstract:

Phytophthora borealis and Phytophthora riparia, identified in recent Phytophthora surveys of forest streams in Oregon, California and Alaska, are described as new species in Phytophthora ITS Glade 6. They are similar in growth form and morphology to P. gonapodyides and are predominately sterile. They present unique DNA sequences, however, and...

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-349 # 2012 by The Mycological Society of America, Lawrence, KS 66044-8897 1133 nov., were paired
Live plant imports: the major pathway for forest insect and pathogen invasions of the US

Creator:

Liebhold, Andrew M., Brockerhoff, Eckehard G., Garrett, Lynn J., Parke, Jennifer L., and Britton, Kerry O.

Abstract:

Trade in live plants has been recognized worldwide as an important invasion pathway for non-native plant pests. Such pests can have severe economic and ecological consequences. Nearly 70% of damaging forest insects and pathogens established in the US between 1860 and 2006 most likely entered on imported live plants. The...

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April Cover_Cover 135 © The Ecological Society of America
Patterns in the occupancy and abundance of the globally rare lichen Erioderma pedicellatum in Denali National Park and Preserve, Alaska

Creator:

Stehn, Sarah E., Nelson, Peter R., Roland, Carl A., and Jones, Jennifer R.

Abstract:

We investigated habitat attributes related to the occupancy of the globally rare and endangered epiphytic lichen, Erioderma pedicellatum, in a newly discovered (2009) population center in Denali National Park and Preserve (DNPP), Alaska. We measured forest, tree and epiphytic lichen community characteristics on eighty-five systematically selected plots in four study...

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E2013 by The American Bryological and Lichenological Society, Inc. Our goals for this study were to

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Botany and Plant Pathology[remove]11
Wood Science and Engineering1

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Nelson, Peter R.2
Beck, Bryan R.1
Britton, Kerry O.1
Brockerhoff, Eckehard G.1
Buckles, G.1
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