The spotted alfalfa aphid
Series: ARS -- 22-39; ARS (Series) (United States. Agricultural Research Service) -- 22-39.
Publisher: Agricultural Research Service, U.S. Dept. of Agriculture
Published: 1957
Place of publication: Washington, D.C.]
Language: eng
Subjects: Spotted alfalfa aphid; Alfalfa; Diseases and pests
Notes: Cover title.

"May 1957."