The Problem

Powdery Mildew

Oidium sp.

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.

Symptoms

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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Solutions

Yates Greenguard Fungicide

Spray plants thoroughly at first sign of disease and then at 10-14 day intervals.

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Yates Fungus Gun - Ready to use

Spray rose and ornamental plants thoroughly when new shoots emerge in spring or at first sign of disease.

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Yates Bravo Fungicide

Spray plants thoroughly. Good coverage is essential. Apply at 10-14 day intervals in wet, humid weather when disease is prevalent.

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