It is Common on many plants and easily recognized, powdery mildew is a fungal disease found throughout the United States. It is caused by a variety of closely related fungal species, each with a limited host range. (The fungi attacking your roses are unlikely to spread to your lilacs). Low soil moisture combined with high humidity levels at the plant surface favors this disease.
Herbal fungicides for Powdery mildew can be used for cotton, potato, ground nut, papaya, chili, tomato, brinjal, cumins and all other vegetables, fruits, flowers & Spices crops.