Index Catalog // ScholarsArchive@OSU

Comments Regarding the Binary Power Law for Heterogeneity of Disease Incidence

Creator:: Turechek, W. W., Madden, L. V., and Gent, D. H.
Abstract:: The binary power law (BPL) has been successfully used to characterize heterogeneity (overdispersion or small-scale aggregation) of disease incidence for many plant pathosystems. With the BPL, the log of the observed variance is a linear function of the log of the theoretical variance for a binomial distribution over the range...
Resource Type:: Article
Full Text:: for Heterogeneity of Disease Incidence W. W. Turechek, L. V. Madden, D. H. Gent, and X.-M. Xu

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...
Resource Type:: Article
Full Text:: Laboratory, and Oregon State University, Department of Botany and Plant Pathology 97330; William W. Turechek

Sensitivity of Disease Management Decision Aids to Temperature Input Errors Associated with Sampling Interval and Out-of-Canopy Sensor Placement

Creator:: Pfender, W. F., Gent, D. H., and Mahaffee, W. F.
Abstract:: Many plant disease epidemic models, and the disease management decision aids developed from them, are created based on temperature or other weather conditions measured in or above the crop canopy at intervals of 15 or 30 min. Disease management decision aids, however, commonly are implemented based on hourly weather measurements...
Resource Type:: Article
Full Text:: and Out-of-Canopy Sensor Placement W. F. Pfender and D. H. Gent, United States Department of

Crown gall in Oregon grapevines : biology and treatment of planting stock with hot water dips [1994-1995]

Creator:: Moore, Larry W. and Canfield, Marilyn
Abstract:: The objectives of this study are to isolate and characterize pathogenic agrobacteria that cause crown gall in grapevines and test hot water dips as a method for eradicating the infectious bacteria . Crown gall is commonly found among Oregon vineyards and the causative agent, Agrobacterium vitis, is known to be...
Resource Type:: Technical Report
Full Text:: and Treatment of Planting Stock With Hot Water Dips Larry W. Moore and Marilyn Canfield Botany and

Phylogenetic placement of the ectomycorrhizal genus Cenococcum in Gloniaceae (Dothideomycetes)

Creator:: Spatafora, Joseph W., Owensby, C. Alisha, Douhan, Greg W., Boehm, Eric W. A., and Schoch, Conrad L.
Abstract:: Cenococcum is a genus of ectomycorrhizal Ascomycota that has a broad host range and geographic distribution. It is not known to produce either meiotic or mitotic spores and is known to exist only in the form of hyphae, sclerotia and host-colonized ectomycorrhizal root tips. Due to its lack of sexual...
Resource Type:: Article
Full Text:: Cenococcum in Gloniaceae (Dothideomycetes) Joseph W. Spatafora1 C. Alisha Owensby Department of Botany and

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:: , Oregon State University Department of Botany and Plant Pathology; and W. F. Pfender, United States

Evolution and Phylogeny of Gnetophytes: Evidence From the Anatomically Preserved Seed Cone Protoephedrites Eamesii gen. et sp nov. and the Seeds of Several Bennettitalean Species

Creator:: Rothwell, Gar W. and Stockey, Ruth A.
Abstract:: A fossil seed cone with characters that have been hypothesized as transitional to the origin of crown group gnetophytes has been discovered in Lower Cretaceous deposits on Vancouver Island, British Columbia, Canada. This cone, described as Protoephedrites eamesii gen. et sp. nov., provides the first anatomically preserved fossil evidence for...
Resource Type:: Article
Full Text:: Author(s): Gar W. Rothwell and Ruth A. Stockey Source: International Journal of Plant Sciences, Vol. 174

Characterisation of virulence reactions for Heterodera avenae populations from two localities in Algeria

Creator:: Haddadi, Fatima, Mokabli, Aissa, and Smiley, Richard W.
Abstract:: Heterodera avenae is widely distributed in areas where most cereal crops are produced in Algeria. However, the virulence of the Algerian populations of this nematode on individual cereal species and cultivars has not been well documented. The virulence of H. avenae populations from Tiaret and from Oued Smar were tested...
Resource Type:: Article
Full Text:: 1 , Aïssa MOKABLI 2 , and Richard W. SMILEY 3 1 Faculté des Sciences Biologiques

Pararaucaria carrii sp nov., anatomically preserved evidence for the conifer family cheirolepidiaceae in the northern hemisphere

Creator:: Stockey, Ruth A. and Rothwell, Gar W.
Abstract:: A cylindrical permineralized conifer seed cone has been identified from the Officer Member of the Trowbridge Formation, near Izee, in east-central Oregon. The cone is preserved in a Middle Jurassic (Callovian) marine calcium carbonate concretion, associated with araucarian seed cones, conifer twigs and wood, cycad seeds, fern rachides, and lycopodialean...
Resource Type:: Article
Full Text:: Hemisphere Author(s): Ruth A. Stockey and Gar W. Rothwell Source: International Journal of Plant Sciences

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

ScholarsArchive@OSU

Comments Regarding the Binary Power Law for Heterogeneity of Disease Incidence

Association of Spring Pruning Practices with Severity of Powdery Mildew and Downy Mildew on Hop

Sensitivity of Disease Management Decision Aids to Temperature Input Errors Associated with Sampling Interval and Out-of-Canopy Sensor Placement

Crown gall in Oregon grapevines : biology and treatment of planting stock with hot water dips [1994-1995]

Phylogenetic placement of the ectomycorrhizal genus Cenococcum in Gloniaceae (Dothideomycetes)

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

Evolution and Phylogeny of Gnetophytes: Evidence From the Anatomically Preserved Seed Cone Protoephedrites Eamesii gen. et sp nov. and the Seeds of Several Bennettitalean Species

Characterisation of virulence reactions for Heterodera avenae populations from two localities in Algeria

Pararaucaria carrii sp nov., anatomically preserved evidence for the conifer family cheirolepidiaceae in the northern hemisphere

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

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