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Filtering by: Subject Apples -- Diseases and pests -- Control Remove constraint Subject: Apples -- Diseases and pests -- Control Degree Name Doctor of Philosophy (Ph.D.) Remove constraint Degree Name: Doctor of Philosophy (Ph.D.) Resource Type Dissertation Remove constraint Resource Type: Dissertation

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  • AppleMgr, a prototype decision aid for apple pest management

    Creator:
    Haley, Sue
    Abstract:
    Computer decision aids can help integrate and apply diverse sources of information and expertise to problems of integrated pest management (IPM) in agriculture and forestry. AppleMgr combines a rule-based expert system with databases and spreadsheets in a prototype decision aid intended to be expanded and modified for use by extension...
    Resource Type:
    Dissertation
    Full Text:
    growers. GrapES is an ES for grape growers in Pennsylvania that integrates disease and insect control

  • Effects of near anaerobic storage conditions on physiology and flavor of various fruit types and on mortality of apple maggot (Rhagoletis pomonella)

    Creator:
    Kosittrakun, Manit
    Resource Type:
    Dissertation
    Full Text:
    Anaerobic Storage Conditions on Physiology and Flavor of Various Fruit Types and on Mortality of Apple

  • 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
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    and other diseases. It attacks more than 200 plant species, including apple (Malus domestica) and

  • 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:
    screening of crab apple varieties and species as indicators of a virus disease in apple. Varietv or species

  • Ecology of mites on pomaceous fruit trees and related wild hosts in Hood River Valley

    Creator:
    Jorgensen, Clive Darrel
    Abstract:
    The ecological interrelationships of mites occurring in and near the Hood River Valley, Oregon, pome fruit orchards were investigated to determine the possibility of an integrated control program using the species already present. Survey sampling methods were used to study mites on wild hosts (Crataegus douglasii Lindl., Crataegus columbiana Howell,...
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    Dissertation
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    more and more on chemical pest control measures which assure higher production while producing fruit

  • Host selection, reproductive biology, host-specific development and mortality of the codling moth, Cydia pomonella (L.) (Lepidoptera: Torticidae), in apple and pear

    Creator:
    Marti, Santiago Marti
    Abstract:
    The biology and behavior of the codling moth, Cydia pomonella (L.), was studied to determine factors responsible for differences in susceptibility to moth damage among apple and pear cultivars. In release experiments, codling moth adults were intercepted in significantly greater numbers in host (apple, pear) than in non-host (maple) trees,...
    Resource Type:
    Dissertation
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    the world, codling moth is the key pest of pome fruits and its control dominates the control

  • 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
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    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

  • Silencing the Agrobacterium tumefaciens oncogenes

    Creator:
    Pitrak, Jennifer
    Abstract:
    Crown gall disease is an agricultural problem caused by the soil-borne bacterium, Agrobacterium tumefaciens. A. tumefaciens oncogenes cause transformed plant cells to overproduce the hormones, auxin and cytokinin. High hormone levels cause unorganized plant cell growth resulting in a gall. Control of crown gall disease is difficult because after plant...
    Resource Type:
    Dissertation
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    prevent crown gall disease in non-transgenic plants. Current control includes labor-intensive and non

  • 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...
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    Dissertation
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    , where the highest levels of disease were found at 10°C and at 30°C, respectively. Wetness duration did