The Problem

Powdery Mildew

Oidium sp.

What is Powdery Mildew?

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.

What are the 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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