Diseases of rose ( Rosa sp. ) in Arizona Powdery mildew

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Diseases of rose ( Rosa sp. ) in Arizona

Powdery mildew
Many foliar diseases common to rose in other areas are not problematic in Arizona because of the dry climate and adaptability of roses to the desert environment. However, powdery mildew of rose, caused by Sphaerotheca pannosa, is a common problem throughout the state. Disease occurs in the spring in the low deserts and usually subsides in June when maximum daily temperatures are above 95 F. In higher elevations, disease may persist throughout the summer. Roses grown in shady areas often have more severe infections.

School of Plant Sciences , Division of Plant Pathology and Microbiology, College of Agriculture and Life Sciences, The University of Arizona
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Last modified: December 15, 2011.
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