The pear psylla in Oregon
By: [P.H. Westigard and R.W. Zwick].
Contributors: Zwick, R. W. 1922-
Series: Technical bulletin / Oregon State University, Agricultural Experiment Station -- 122.; Technical bulletin (Oregon State University. Agricultural Experiment Station) -- 122.
Publisher: Agricultural Experiment Station, Oregon State University
Published: 1972
Place of publication: Corvallis, Or
Language: eng
Number of pages: 22
Subjects: Psylla -- Oregon.; Pear -- Diseases and pests -- Oregon.
Notes: Cover title.

Bibliography: p. 20-22.