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You asked:

What's causing the white dust on the leaves of my Cox apple tree?

Our Advice:

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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