The hop aphis, Phorodon humuli (Schrank) and its control in the Willamette Valley
By: by Noal P. Larson.
Published: 1936
Language: eng
Number of pages: 66
Subjects: Hop-aphis -- Control -- Oregon -- Willamette River Valley.
Notes: Typescript.

Thesis (M.S.)--Oregon State College, 1936.

Bibliography: leaves 44-45.