Macrolichens of the Pacific Northwest. By Bruce McCune and Linda Geiser. Photographs by Sylvia & Stephen harnoff; drawings by Alexander Mikulin. Corvallis: Oregon State University Press. 1997. pp. 386, 203 colour photographs, numerous line drawings. ISBN 0 87071 394 9. Price USS25.95.

1999 ◽  
Vol 31 (2) ◽  
pp. 211-211
Author(s):  
B. J. Coppins
Keyword(s):  
Pacific Northwest ◽  
State University ◽  
Line Drawings ◽  
The Pacific ◽  
Oregon State University

scholarly journals Response of Hazelnut Accessions to Greenhouse Inoculation with Anisogramma anomala

HortScience ◽  
2010 ◽  
Vol 45 (7) ◽  
pp. 1116-1119 ◽  
Author(s):  
Vidyasagar R. Sathuvalli ◽  
Shawn A. Mehlenbacher ◽  
David C. Smith
Keyword(s):  
Pacific Northwest ◽  
Single Gene ◽  
Genetic Resistance ◽  
State University ◽  
Sources Of Resistance ◽  
The Pacific ◽  
Anisogramma Anomala ◽  
Southern Russia ◽  
Host Genetic ◽  
Oregon State University

Eastern filbert blight (EFB), caused by the pyrenomycete Anisogramma anomala (Peck) E. Müller, is a devastating disease of European hazelnut (Corylus avellana L.) in the Pacific Northwest. Host genetic resistance from ‘Gasaway’ has been used extensively for breeding hazelnuts at Oregon State University. Concern over the durability of this single-gene resistance prompted a search for new sources of resistance. In this study, 86 accessions from 11 countries were evaluated for their response to greenhouse inoculation with the pathogen. Nine accessions showed complete resistance, including one from Chile (‘Amarillo Tardio’), two from Serbia (‘Crvenje’ and ‘Uebov’), one from southern Russia (OSU 495.072) and five from Moscow, Russia. These new sources of EFB resistance have geographically diverse origins and will broaden the genetic base of EFB-resistant hazelnut germplasm. The previously reported resistance of ‘Grand Traverse’ from Michigan and the susceptibility of ‘Closca Molla’ from Spain were confirmed.

scholarly journals First Report of Gnomoniopsis idaeicola Causing Cane Wilt and Canker in Commercial Blackberry Fields in Oregon

Plant Disease ◽  
2021 ◽  
Author(s):  
Virginia Stockwell ◽  
Brenda T. Shaffer ◽  
Gayle C. McGhee ◽  
Michael A. Hardigan
Keyword(s):  
Pacific Northwest ◽  
Phylogenetic Analyses ◽  
Its Region ◽  
The United States ◽  
State University ◽  
The Pacific ◽  
Agar Surface ◽  
Core Facilities ◽  
Oregon State University ◽  
Β Tubulin

Oregon is the leading producer of blackberries in the United States (USDA 2021). In November 2020, we visited a seven-year-old, 5.6 HA field of thornless trailing cultivar ‘Columbia Star’ in Marion County, Oregon in response to grower reports of rapid plant death that they called ‘Blackberry Collapse.’ The pattern of disease in the field was semi-circular patches of dead plants. We estimate that ca. 17% of the plants were killed. Symptoms included fewer and stunted primocanes, floricane reddening, premature floricane senescence, or elliptical or irregular brown to purple cane lesions often near the base of necrotic petioles clasping the cane. Twenty-two cane lesions were collected, surface-disinfested, and placed on potato dextrose agar with streptomycin. In addition to common Rubus cane pathogens (Kalmusia coniothyrium, Botrytis spp., Diaporthe spp., and Seimatosporium lichenicola), Gnomoniopsis idaeicola was isolated from 23% of the samples. After isolation of G. idaeicola from ‘Columbia Star’, we also isolated the pathogen from symptomatic ‘Black Diamond’ blackberry in fields in Washington and Linn Counties in Oregon. G. idaeicola grew as white- to cream-colored circular colonies on the agar surface with sparse to dense aerial hyphae. Some isolates produced cream-colored exudate from irregular conidiomata. Conidia were single-celled, hyaline, oval to ellipsoid, and ranged from 4.9 to 6.9 µm long and 1.2 to 2.5 µm wide (n = 100). Perithecia and ascospores were not seen on canes or in culture; molecular methods were used to identify the fungus. Genomic DNA was extracted from nine isolates and β-tubulin, ITS region, and tef-1α were amplified using the primers and conditions described by Walker et al. (2010). Amplicons were Sanger sequenced in both directions by the Core Facilities of the Center for Quantitative Life Sciences of Oregon State University, Corvallis, OR. Sequences were deposited in GenBank (β-tubulin OK539758-OK539766; ITS OK348854-OK348862; tef-1α OK539767-OK539775). β-tubulin sequences (737 bp) were 100% identical to sequence of G. idaeicola from Rubus procerus, Oregon (GU320783). ITS sequences (518 bp) were 99.2 to 100% identical to G. idaeicola CBS125674T (GU320796). tef-1α sequences (860 bp) were 99.9 to 100% identical with reference sequences of G. idaeicola. Phylogenetic analyses of concatenated sequences using Tamura-Nei neighbor-joining (Tamura et al. 2004) confirmed identity. Pathogenicity of G. idaeicola isolates was tested in repeated experiments on four to five detached ‘Black Diamond’ primocanes and potted ‘Columbia Star’ plants with 4 mm hyphal plugs placed on fresh wounds and wrapped in parafilm; controls were treated with sterile agar plugs (Ellis et al. 1984; Stevanović et al. 2019). By 14 days, in each experiment, expanding necrotic lesions were observed on canes inoculated with G. idaeicola, but not with sterile agar plugs. ITS-sequence of fungi isolated from lesions confirmed identity as G. idaeicola, fulfilling Koch’s postulate. G. idaeicola was described as a new species by Walker et al. (2010) from perithecia collected from wild Rubus spp. in the Pacific Northwest. Despite its presence on native Rubus, G. idaeicola has not been reported in commercial blackberry fields in OR. Stevanović et al. (2019) identified G. idaeicola as an important pathogen causing canker, wilt, and death of blackberry in Serbia. Surveys of Oregon blackberry fields for G. idaeicola are ongoing, along with research on the epidemiology and management of this emerging pathogen.

scholarly journals Index and Engineering Properties of Oregon Cob

2011 ◽  
Vol 6 (2) ◽  
pp. 88-106 ◽  
Author(s):  
Quinn M Pullen ◽  
Todd V Scholz
Keyword(s):  
Tensile Strength ◽  
Elastic Modulus ◽  
Pacific Northwest ◽  
The United States ◽  
Strength Properties ◽  
Engineering Properties ◽  
Unit Weight ◽  
State University ◽  
The Pacific ◽  
Oregon State University

Cob is an earthen building material comprised of sand, clay, straw, and water used for millennia to construct dwellings. Although cob construction largely died out during the nineteenth century, it is experiencing a revival in England and the Pacific Northwest of the United States. Little scientific research has investigated the engineering properties of cob, knowledge of which is important for modern-day design practices and code requirements. Researchers at Oregon State University investigated six different Oregon cob mixtures using a series of standard soils and concrete tests adapted for this material. The objectives were to characterize the constituents, to establish estimates for the magnitude of, and degree of variability in, the mixture properties, and to develop correlations between the engineering properties and mixture composition. Results indicated low to moderate variation in basic mixture properties (i.e., unit weight, moisture content, and sand equivalent), moderate variation in strength properties, and high variation in the elastic modulus. Several reasonable correlations were found between shrinkage, compressive strength, elastic modulus, and sand equivalent and between flexural strength and fiber tensile strength.

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