Powdery mildew - fungal leaf disease - how to eliminate powdery mildew
What is Powdery Mildew?
Powdery mildew is a fungal disease that affects a wide range of plants. Infected plants display white powdery spots on the leaves and stems. The lower leaves are the most affected, but the mildew can appear on any above-ground part of the plant. As the disease progresses, the spots get larger and denser as large numbers of asexual spores are formed, and the mildew may spread up and down the length of the plant. Powdery mildew grows well in environments with high humidity and moderate temperatures.
Powdery mildew can prevail on ornamental roses. Bayer recommends using Dedicate Turf and Ornamental Fungicide. Spray to run-off ensuring thorough coverage of all foliage including the underside of leaves every 7 - 14 days according to infection pressure or beginning immediately after onset of the disease.