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Filtering by: Creator Henning, J. A. Remove constraint Creator: Henning, J. A. Academic Affiliation Botany and Plant Pathology Remove constraint Academic Affiliation: Botany and Plant Pathology

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  • Relation of boron to cherry rosette disease in Oregon, and the possible implication in Oregon, and the possible implication of a virus

    Creator:
    Bolwyn, Bart
    Abstract:
    A disease of sweet cherry (Prunus avium L.) known as "cherry rosette" has threatened production of cherries in Oregon. In 1961 this disease was observed in widely separated orchards. Rosette occurred in isolated trees or in spreading patterns, often from identified single trees or from one section of an orchard....
    Resource Type:
    Dissertation
    Full Text:
    for privacy Abstract approved: Dr. J. A. Milbrath A disease of sweet cherry (Prunus avium L

  • The use of flowering crab apples for the detection of latent viruses in apples

    Creator:
    Reynolds, James Edward
    Abstract:
    Recent investigations indicate that several latent viruses of apples exist in common commercial apple stocks, but these viruses and their relationships are incompletely understood. This thesis describes investigations of crab apples as indicators of latent viruses of apples. Eighty-eight varieties and species of crab apples were tested as indicators of...
    Resource Type:
    Dissertation
    Full Text:
    Privacy Redacted for Privacy ACKNOW-LEDGEMENT The author wishes to express his gratitude to Dr. J. A

  • Isolation and identification of dahlia viruses

    Creator:
    Lawson, Roger Harold
    Abstract:
    Three viruses were isolated from dahlias using a modification of Yarwood's leaf-disc method of inoculation. Two of these isolates have been reported previously in dahlias. In addition, a fourth virus was isolated using a liquid-nitrogen transmission technique. Dahlia virus isolate 1 possessed host range and thermal inactivation properties similar to...
    Resource Type:
    Dissertation
    Full Text:
    " ACKNOWLEDGMENTS The author wishes to thank Dr. J. A. Milbrath and Dr. T. C. Allen, Jr., for their assistance

  • Methods of separating viruses from the inhibitors present in Chenopodium amaranticolor

    Creator:
    Bhullor, Sukhbir
    Abstract:
    The infectivity of plant viruses was suppressed by inhibitory substances (IS) in the sap of Chenopodium. Various methods were attempted to find an efficient method which would allow direct transmission of viruses from Chenopodium to other plants. Viruses used in these experiments were alfalfa mosaic virus (AMV), tobacco mosaic virus...
    Resource Type:
    Dissertation
    Full Text:
    Privacy ACKNOWLEDGEMENTS The author wishes to thank Dr. J. A. Milbrath for his assistance during the

  • Latent viruses in apple varieties in Oregon nurseries

    Creator:
    Dimalla, Gerard George
    Resource Type:
    Masters Thesis
    Full Text:
    is expressed to Dr. J. A. Milbrath for his encouragement and help throughout this work, and to Mr

  • Vegetation, Bryophytes, Lichens, Environment, and Stand Dynamics in Forests of the Swan Valley, Montana

    Creator:
    McCune, Bruce and Antos, Joseph A.
    Abstract:
    We sampled vegetation, bryophytes, lichens, environment, and stand dynamics in 56 plots in the Swan Valley, Montana in 1975-1978. The data include complete inventory of trees in 375 m2 plots, with whole-plot ocular estimates of plant cover by species, transect sampling of the ground layer bryophytes and lichens with microplots,...
    Resource Type:
    Dataset
    Full Text:
    Log(ht) - Log(SI - 20.902(1/A-1/50), Schmidt, Shearer * Roe 1976 USDA Tech. Bull. 1520. SiteData 18

  • A biochemical analysis of the interaction of victorin and oats

    Creator:
    Navarre, Duroy A.
    Abstract:
    Victoria blight of oats is caused by the fungus Cochhobolus victoriae. This fungus is pathogenic due to its ability to produce the host-selective toxin victorin. Previously, a 100-kD protein that binds victorin in vivo only in susceptible genotypes was identified as the P protein of the glycine decarboxylase complex (GDC)....
    Resource Type:
    Dissertation
    Full Text:
    ., Siedow, J. N., Timothy, D.H., and Levings III, C. S. 1988. A 13­ kilodalton maize mitochondria! protein

  • Conservation biology of Perideridia erythrorhiza (Apiaceae) : experimental reintroduction and life history

    Creator:
    Roberts, Kimberly A.
    Abstract:
    An experimental reintroduction was performed to determine the best method to create new populations of the tuberous species Perideridia erythrorhiza, a rare vascular plant endemic to southern Oregon. Only a handful of sites are currently present, and many of these are subject to other land uses such as urban development...
    Resource Type:
    Masters Thesis
    Full Text:
    West 9:4-9. Lambeck, R. J. 1997. Focal species: a mulit-species umbrella for nature conservation

  • Mitigating cyanobacterial harmful algae blooms : the role of plant humics

    Creator:
    Theis, Susan A. F.
    Abstract:
    Cyanobacterial harmful algae blooms (cyanoHABs) are a growing concern worldwide due to damage of ecosystems and threats to human health. Previous research indicates that plant humics from aquatic and wetland vascular plants are effective inhibitors of cyanobacterial metabolism and growth and may be useful as control agents for mitigating cyanoHABs....
    Resource Type:
    Masters Thesis
    Full Text:
    : ____________________________________________ Allen J Milligan Abstract: Cyanobacterial harmful algae blooms (cyanoHABs) are a

  • A revision of Juncus subgenus genuini (Juncaceae) in the Pacific states

    Creator:
    Lint, Harold LeRoy
    Abstract:
    A study was made of the subgenus Genuini of the genus Juncus in the Pacific States, California, Oregon and Washington. Extensive morphological comparisons, geographical distributions, habitat differences and observations of apparent presence or absence of natural hybrids provided the major data sources. Cytological studies were made, but were inconclusive. Eleven...
    Resource Type:
    Dissertation
    Full Text:
    hybrid between the coastal dune species, J. breweri, and one or more subspecies of J. balticus. A third