By Katya
Kent,
United Kingdom 
Does anyone know of a proprietory fungicide that's OK for edible plants - in this case an apple tree? Our little Cox's Pippin, planted last autumn, has powdery mildew, as does a larger tree belonging to our neighbour, which might have infected ours.
28 Apr, 2011
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Potassium carbonate is one that should be safe.
30 Apr, 2011