Host Preference and Resistance of Pyrus Species to the Pear Psylla, Psylla pyricola Foerster1

Journal of the American Society for Horticultural Science

Host Preference and Resistance of Pyrus Species to the Pear Psylla, Psylla pyricola Foerster^¹

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P. H. Westigard

P. H. Westigard Oregon State University

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M. N. Westwood

M. N. Westwood Oregon State University

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P. B. Lombard

P. B. Lombard Oregon State University

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P. H. Westigard

P. H. Westigard Oregon State University

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M. N. Westwood

M. N. Westwood Oregon State University

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P. B. Lombard

P. B. Lombard Oregon State University

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^¹Received for publication July 5, 1969. Technical paper No. 2751 Oregon Agricultural Experiment Station.

^²Southern Oregon Experiment Station, Medford.

^³Department of Horticulture, Corvallis.

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