Fungicides for powdery mildew and rust in roses
Albert O. Paulus, University of California
Jerry Nelson, University of California
California Agriculture 37(3):20-21. DOI: 10.3733/ca.v037n03p20.
Not available – first paragraph follows:
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.
Albert O. Paulus is Cooperative Extension Plant Pathologist, University of California, Riverside. Jerry Nelson is Extension Staff Research Associate, University of California, Riverside.