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.Promptly pick off and destroy affected leaves. If leaf spot is a persistent problem, try growing your primulas under glass.Spraying with myclobutanil may help give some control, although they're not specifically labelled as a solution for primula leaf spot

. Infected foliage must be disposed of immediately, as the fungus can survive on the plant if left lying on the ground. The early, large-flowering varieties are most prone to attack, with smaller-flowering species (eg, C. montana) being the most resistant

There are many different fungi that cause this problem, each of which usually affects a particular plant or group of plants. In each case they produce similar symptoms. Affected plants will have discoloured leaves, often also distorted when young