Powdery mildew
Subtitle: a serious apple disease problem in the eastern states
Series: ARS -- 22-22; ARS (Series) (United States. Agricultural Research Service) -- 22-22.
Publisher: U.S. Dept. of Agriculture, Animal and Plant Health Service
Published: 1956
Place of publication: Washington, D.C
Language: eng
Subjects: Powdery mildew diseases