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Diseases of Roses Oklahoma State University
WebBattling mildew, mold and black spot. Black spot on rose foliage. Photo: Whitney Cranshaw, Colorado State University, Bugwood.org, author of Garden Insects of North America. Mid- to late summer is when most plant diseases start becoming noticeable. Powdery mildew, black spot, and gray mold (Botrytis) are three of the most common flower diseases. WebMar 13, 2024 · Cut back roses with black spot. Remove any infected leaves and always do a thorough cleanup each fall. Remove and dispose of any remaining leaves when you do your dormant rose pruning in late winter/early spring. Spores can remain on leaves and stems and can reinfect whenever conditions are favorable. fisher window cleaning llc
How to Identify and Treat 9 Common Rose Diseases
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