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pull them out if they appear in the garden. Every two weeks from early spring onwards spray plants with a systemic action fungicide.hollyhocks, mallowall year roundCommon fungal problems affecting plantsIris leaf spotRose blackspotRose rustTulip fire

.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

-magnesium carbonate to the soil in autumn or winter to remedy the deficiency for next year.potatoes, apples, cherries, grape vines, tomatoes, camellias, rhododendronssummer, autumn, winterMore common plant problemsCanna virusRaspberry nutrient deficiencyHollyhock rust