Phloem necrosis
Subtitle: a virus disease of the American elm
By: by Roger U. Swingle
Series: Circular / United States Department of Agriculture -- no. 640; Circular (United States. Dept. of Agriculture) -- no. 640.
Publisher: U.S. Dept. of Agriculture
Published: 1942
Place of publication: Washington, D.C
Language: eng
Subjects: American elm; Elm phloem necrosis; Diseases and pests
Notes: Caption title.