Powdery mildew of ornamental plants
By: [by Freeman Weiss]
Series: Leaflet / United States. Dept. of Agriculture -- no. 197; Leaflet (United States. Dept. of Agriculture) -- no. 197.
Publisher: U.S. Dept. of Agriculture
Published: 1940
Place of publication: Washington, D.C
Language: eng
Subjects: Powdery mildew diseases; Ornamental Plants; Diseases and pests
Notes: Cover title.

"Issued April 1940"--P. 1.