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Filtering by: Subject Roses -- Rootstocks -- Diseases and pests -- Control Remove constraint Subject: Roses -- Rootstocks -- Diseases and pests -- Control Degree Level Doctoral Remove constraint Degree Level: Doctoral Degree Name Doctor of Philosophy (Ph.D.) Remove constraint Degree Name: Doctor of Philosophy (Ph.D.)

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  • Effects of volatile fungicides on Sphaerotheca pannosa on rose

    Creator:
    Gallian, John J.
    Resource Type:
    Dissertation
    Full Text:
    and the most serious disease faced by the cut rose producer. Control in the greenhouse has been

  • Relation of nitrogenous substances in rose leaves to powdery mildew resistance

    Creator:
    Bartlett, Allan B.
    Abstract:
    There is considerable variation among rose varieties in susceptibility to mildew, and as a result of maturation, leaves of most susceptible varieties become resistant to infection. The nature of resistance has been sought in various studies involving environmental, morphological, and physiological factors. An attempt was made in the present investigation...
    Resource Type:
    Dissertation
    Full Text:
    disease. Two or more extracts from healthy and diseased leaves from each of the six rose varieties were

  • Coniothyrium rose canker in Oregon

    Creator:
    Intrama, Siriphong
    Abstract:
    An isolate of Coniothyrium obtained from a stem canker on Nocturne rose from the Botany Department Farm, Corvallis, Oregon was studied with respect to morphological and cultural characters, pathogenicity and mineral nutrition. The hyphae of the isolate were smooth, septate and branched. The hyphal cells averaged 16.37 X 3.52 microns....
    Resource Type:
    Dissertation

  • Isolation, purification, serology and nature of rose mosaic virus

    Creator:
    Halliwell, R. S. (Robert S.)
    Resource Type:
    Dissertation
    Full Text:
    records of a virus-like disease of rose in the United States was by Taubenhaus in 1923 (37) and 1925 (38

  • Management of variegated cutworm in peppermint

    Creator:
    Coop, Leonard Bryan
    Abstract:
    A pest management program for variegated cutworm (VC), Peridroma saucia (Hubner), in Oregon peppermint was developed based on studies of pheromone trapping, sampling methods, and economic thresholds. Pheromone traps effectively trapped VC males and were used to reflect development and oviposition trends. Trap height was linearly correlated to moth catch...
    Resource Type:
    Dissertation
    Full Text:
    thresholds (number of larvae/1000 cm2 as a function of peppermint oil price, cost of control, and field class

  • Decomposition of Basamid in Douglas-fir heartwood

    Creator:
    Forsyth, Paul Griffin
    Abstract:
    Basamid^R (3,5-dimethy1-1,3,5,2H-tetrahydrothiadiazine- 2-thione) is a crystalline powder used as a soil sterilant. This fumigant acts in soil by decomposing to methylisothiocyanate (MITC), the primary active ingredient, as well as hydrogen sulfide, methylamine, and formaldehyde. In wood, Basamid decomposes too slowly to be efficacious against decay fungi unless amended with various...
    Resource Type:
    Dissertation

  • Studies on the etiology and epidemiology of bull's eye rot of pears

    Creator:
    Henriquez, Jose Luis, 1961-
    Abstract:
    The objective of this dissertation is to introduce low-cost processing methods for the fabrication of ZnO transparent thin-film transistors (TTFTs). A novel method for depositing ZnO body layers via spin-coating of a zinc nitrate-based spin solution is presented. The processing conditions of spin-coated ZnO are optimized to produce continuous and...
    Resource Type:
    Dissertation
    Full Text:
    , where the highest levels of disease were found at 10°C and at 30°C, respectively. Wetness duration did

  • Classical biological control of the filbert aphid, Myzocallis coryli (Goetze) (Homoptera:Aphididae) in western Oregon

    Creator:
    Messing, Russell H.
    Abstract:
    A classical biological control project was undertaken against the filbert aphid, Myzocallis coryli (Goetze), in western Oregon. Hazelnut orchards in Spain, France, and Italy were searched for natural enemies of the aphid, and a parasitic wasp, Trioxys pallidus Haliday, was imported, quarantined, mass-reared, and released in Oregon orchards. The wasp...
    Resource Type:
    Dissertation
    Full Text:
    guild. 2. The aphid is a serious, constant pest in hazelnut production. It is costly to control, and

  • Management of powder-post beetles, Dinoderus minutus F. in freshly cut bamboo

    Creator:
    Garcia, Carlos Manalo
    Abstract:
    The goal of this project was to develop an integrated pest management strategy for the control of a powder-post beetle (Dinoderus minutus F.). This species causes serious damage in Philippine bamboo. Developmental threshold and thermal constants were examined and natural enemies and ftmgi associated with beetles were investigated. Finally, the...
    Resource Type:
    Dissertation
    Full Text:
    project was to develop an integrated pest management strategy for the control of a powder-post beetle

  • Plant hormone-induced defense responses against Botrytis cinerea

    Creator:
    Akagi, Aya
    Abstract:
    Several plant hormones, including ethylene and jasmonates, are known to mediate responses against biotic and abiotic stress. The first and second objectives of this thesis were (i) to elucidate the role of ethylene in defense responses against Botrytis cinerea and specifically (ii) to determine the potential contribution of ethylene response...
    Resource Type:
    Dissertation
    Full Text:
    ............................................................................................... 30  Softening and disease progression ..................................................... 33