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Browsing Agricultural Experiment Station -- Technical Bulletins by Author "Westigard, Peter H."

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Browsing Agricultural Experiment Station -- Technical Bulletins by Author "Westigard, Peter H."

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  • Westigard, Peter H.; Lombard, P. B. (Porter B.); Berry, Donald W. (Corvallis : Agricultural Experiment Station, Oregon State University, 1967-11)
  • Westigard, Peter H.; Zwick, Robert Ward, 1922- (Corvallis : Agricultural Experiment Station, Oregon State University, 1972-11)
    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 l ...

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