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Filtering by: Subject Psylla -- Oregon Remove constraint Subject: Psylla -- Oregon Subject Pear -- Diseases and pests -- Oregon Remove constraint Subject: Pear -- Diseases and pests -- Oregon

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  • The pear psylla in Oregon

    Creator:
    Westigard, Peter H. and Zwick, Robert Ward, 1922-
    Abstract:
    Since its discovery in Oregon in 1946, the pear psylla, Psylla pyricola Forster, has become the most serious insect pest of pear. Damage to pear trees include the transmission of pear decline disease which has caused losses of trees, injection of a phytotoxic toxin resulting in tree shock and injury,...
    Resource Type:
    Technical Report
    Full Text:
    Pear Psylla in Oregon Technical Bulletin 122 AGRICULTURAL EXPERIMENT STATION Oregon State University

  • The potential of endemic natural enemies to suppress pear psylla, Cacopsylla pyricola Förster, in the Hood River Valley, Oregon

    Creator:
    Booth, Steven R.
    Abstract:
    This thesis addressed the potential of endemic predaceous and parasitic arthropods of the Hood River Valley, Oregon to suppress the pear psylla, Cacopsylla pyricola F8rster. Natural enemies adequately suppressed psylla in three of seven unsprayed orchards of differing vegetational settings, orchard age, and size. Relatively few psylla natural enemies dispersed...
    Resource Type:
    Dissertation
    Full Text:
    psylla, Cacopsylla pyricola Förster, in the Hood River Valley, Oregon AN ABSTRACT OF THE THESIS OF