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Ministry of Agriculture, Food and Rural Affairs

disease Identification Key

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White powdery fungal growth on leaves
White powdery fungal growth on leaves (sometimes blossoms); leaves may drop prematurely and fail to elongate and unfold normally; those on new shoots may become narrow and distorted. May cause russetting on the fruit.
Foliage is silvery in appearance
Foliage is silvery in appearance, symptoms typically associated with a branch or an entire tree. Heartwood of affected tree often become discoloured.