rosy apple Aphis (Aphis sorbi)
By: by A.L. Lovett. The green apple Aphis (Aphis pomi).
Contributors: Oregon Agricultural College. Extension Service.
Series: Cir -- 142.; Circular (Oregon Agricultural College. Extension Service) -- 142.
Publisher: Oregon Agricultural College, Extension Service
Published: 1919
Place of publication: Corvallis, OR
Language: eng
Subjects: Aphis.; Apples -- Diseases and pests.
Other titles: Green apple Aphis (Aphis pomi).
Notes: No collective t.p.; titles taken from beginning of each section.

"March 1919."