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Humid Summer Rose Care Humid summers favour leaf diseases because foliage stays wet longer and spores spread through rain splash, irrigation, pruning debris, and dense growth. The goal is not sterile... Wiki page Updated by localroot Downy Mildew and Botrytis Downy mildew and botrytis both become more important when conditions are cool, moist, humid, or crowded. They can be confused with other rose problems from a single photo. Downy... Wiki page Updated by localroot Rose Rosette Disease Rose Rosette Disease, often shortened to RRD, is a serious viral disease of roses. It is associated with distorted new growth and is spread primarily by eriophyid mites and by g... Wiki page Updated by localroot Black Spot Black spot is a common fungal rose disease. It is worse where leaves stay wet, where airflow is poor, and on susceptible cultivars. Signs. Dark round spots, often with feathery... Wiki page Updated by localroot Rust Rose rust is a fungal disease that often shows as orange, yellow-orange, or dark pustules on leaf undersides and sometimes stems. It is usually worse in cool, moist conditions a... Wiki page Updated by localroot Pest and Disease Index Use this index to connect symptoms with likely causes, better photos, and reputable references. It is not a substitute for a diagnostic lab, especially when a plant may need rem... Wiki page Updated by localroot Powdery Mildew Rose powdery mildew produces white to grey powdery growth on leaves, shoots, buds, sepals, and sometimes petals. Young tissue can curl, distort, and fail to open well. Condition... Wiki page Updated by localroot