Controlling powdery mildew and rust in roses
AuthorsAlbert O. Paulus
Hilgardia 42(4):15-15. DOI:10.3733/ca.v042n04p15. July 1988.
Powdery mildew is undoubtedly the most widespread disease of roses. The causal fungus, Sphaerotheca pannosa var. rosae, appears as a white or gray powdery or mealy coating on the leaves, tender stems, and flower buds. It distorts and discolors those areas, causes defoliation, and reduces plant vigor.
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