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Spores carried by water and wind spread this fungus, which leaves primula foliage peppered with holes. The initial signs are spots in a yellow-orange area, or in grey, papery tissue. When the centre falls out, holes appear. Look beneath the leaves and there may also be white fungal growth.
Solution
Organic
Promptly pick off and destroy affected leaves. If leaf spot is a persistent problem, try growing your primulas under glass.
Chemical
Spraying with myclobutanil or penconazole may help give some control, although they're not specifically labelled as a solution for primula leaf spot.
