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Powdery mildew is a fungus which spreads a white or ash-grey film over the upper and lower surfaces of the leaves of plants-usually the older leaves. Powdery mildew fungus favours high humidity and dry conditions. Water splash and air currents spread the spores of powdery mildew which grows on the surface of the leaf only. Powdery mildew is a common disease of roses, crepe myrtles, dahlias, zinnias, calendulas, sweet peas, cucurbits and vine crops. Spray regularly for control in warm and humid conditions.
Appearance of a whitish film on leaves and buds. New growth is distorted and older leaves become blackened. Flower buds may fail to open.
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A systemic fungicide which travels throughout the plant to control disease.
Spray foliage thoroughly, including the undersides of foliage. Start spraying when new shoots emerge in Spring, or at first sign of insects or disease.
