Vol. 17, Issue 1, 1963January 01, 1963 PDT
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Pear psylla: In abandoned orchards
Pear psylla: In abandoned orchards
P Westigard, H Madsen,
Westigard, P, and H Madsen. 1963. “Pear Psylla: In Abandoned Orchards.” California Agriculture 17 (1): 6–9.