Powdery mildew is a common disease infecting a wide range of plants, covering leaves with a dense, greyish powder.
Powdery mildew diseases are very common. Many vegetables, bedding plants, fruit crops, shrubs and trees can be infected. Typically infected leaves and shoots are discoloured, distorted and covered in a dense, greyish coloured powder like material.
Powdery mildew is most common in Summer and Autumn when the weather is warm and humid.
Downy mildew has similar symptoms except the greyish powdery material is on the undersides of leaves.
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