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The WaterWise Garden produces Gardening Software for WaterWise Xeriscape Drought Tolerant Plants and Organic Gardening

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Black Spot
Black spot (Marssonina rosae) a fungal disease that can attack roses
Black Spot - Marssonina rosae- on a Rose leaf.

Black spot (Marssonina rosae) a fungal disease that can attack roses
Black Spot - Marssonina rosae - on a Rose leaf.

 Black Spot ( Marssonina rosae ) is a fungal disease that can attack the leaves of roses. The rounded spots, up to 12mm (1/2in) in diameter, are generally worse during humid weather. Affected leaves often turn yellow and fall prematurely. In the case of badly infected roses, the new leaves will also bear the disease and eventually the entire bush can be defoliated.


Black Spot on roses can be prevented, or at the very least the occurrence minimized, by taking the following organic gardening precautions :

Allow for the free circulation of air around rose bushes and thereby reduce the humidity level.
Prune so that the centre of the rose bushes are not congested.
Water at the base of roses and not the leaves. This is particularly important when watering late in the day, as the leaves will remain wet for an extended period.
Remove affected leaves and pick up any that have fallen. Leaves from diseased roses should be placed in a bag and disposed of. Never put the leaves from diseased roses into the compost bin.


A simple home-made spray to prevent Black Spot on roses can be made from bicarbonate of soda, or a mixture of Chamomile, Chive, Elder, Horseradish and Casuarina leaves.
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Last Updated 25 May 2009		 Suppliers of Gardening Software for WaterWise Xeriscape and
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