Fungicides for powdery mildew and rust in roses
California Agriculture 37(3):20-21.
Published March 01, 1983
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Powdery mildew is undoubtedly the most widespread disease of roses. The casual fungus, Sphaerotheca pannosa var. rosae, appears as a white or gray powdery or mealy coating on the leaves, tender stems, and flowerbuds. It distorts and discolors those areas, causes defoliation, and reduces plant vigor.