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How do I control imperfections on my roses?

My rose bushes seem to have a discolouration on the leaves. How should I treat this?

The best course of action is to spray the foliage regularly with a fungicide and ensure you water the plants in the morning over the afternoon. Try to water at the base of the plant rather than on the leaves, as the moist environment is a perfect breeding ground for species of fungi. Keep the plant in full sun with access to free air flow and mulch regularly to avoid disease.  Roses need a good deep watering once a week.