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necrosis virus affects mainly early flowering cultivars and produces brown-streaked stems and leaves.Tulips display a range of symptoms from markings on the leaves and flowers with loss of vigour, to deformed plants and brown-streaked stems. Tulip bulbs

on the petals. Sometimes the flower stem collapses and the whole plant can end up covered in fungus, especially after heavy rain.Withered, distorted tulip leaves are covered in brown spots followed by a grey fungal growth. Any flowers that are produced have pale

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

the affected parts. In a few cases genetic mutation is the cause, and the deformity will be permanent.delphiniums, forsythias, lilies, primulas and other plantsspring, summer, autumn, winterCommon problems affecting plantsReversionMagnesium deficiencyRose rustTulip

to an attack. Clear away leaf debris lying on the ground around the plants. Take care not to damage leaves and stems unnecessarily.irisesspring, summer, autumnCommon fungal problems affecting plantsRustRhododendron leaf spotTulip firePrimula leaf spot