TY - JOUR AU - Paulus, Albert O. AU - Nelson, Jerry TI - Fungicides for powdery mildew and rust in roses JF - California Agriculture JO - Calif Agr Y1 - 1983/03/01 VL - 37 IS - 3 SP - 20 EP - 21 PB - University of California Agriculture and Nature Resources SN - 0008-0845 UR - http://www.ucanr.edu/sites/calagjournal/archive/?article=ca.v037n03p20 AB - 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.