The powdery mildew and black spot of roses
By: by H.P. Barss.
Contributors: Oregon Agricultural College. Extension Service.
Series: Cir -- 94.; Circular (Oregon Agricultural College. Extension Service) -- 94.
Publisher: Oregon Agricultural College, Extension Service
Published: 1918
Place of publication: Corvallis, OR
Language: eng
Subjects: Roses -- Diseases and pests -- Oregon.; Roses -- Diseases and pests -- Control -- Oregon.; Powdery mildew diseases -- Oregon.
Notes: Caption title.

"Mar. 4,  1918."