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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

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

There are many species of aphid, often with its own favourite host plants and particular life cycle. Greenfly and blackfly are the most familiar, but there are also yellow, red, orange and brown aphids. Aphids usually spend the summer on one plant