The effectiveness of various treatments for control of powdery mildew was tested on 360 rose plants. The three varieties of roses used in the study were chosen because of their susceptibility to powdery mildew.
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May 1960 Vol. 4, Issue 1 Pages 1, 3
Allan Bartlett & Ira W. Deep Botany and Plant Pathology Department Oregon State College, Corvallis, OR