relation of woolly apple aphis to perennial canker infection with other notes on the disease
By: [by Leroy Childs].
Series: Station bulletin / Oregon Agricultural College Experiment Station -- 243.; Station bulletin (Oregon State Agricultural College. Agricultural Experiment Station) -- 243.
Publisher: Agricultural Experiment Station, Oregon State Agricultural College
Published: 1929
Place of publication: Corvallis, Ore
Language: eng
Number of pages: 31
Subjects: Woolly apple aphid; Apple -- Diseases and pests
Notes: Cover title.