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What's causing the white dust on the leaves of my Cox apple tree?
From your description it sounds like apple tree has powdery mildew. Spraying with SB Plant Invigorator plus 5 grams of baking powder per litre of spray solution at weekly intervals to control this problem. Powdery mildew is often a sign of water stress in plants, so make sure you keep the plant well watered in dry weather.
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