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BLACK SPOT
ON ROSES - organic control
Black spot is a fungal disease which can be a major problem all year round in warmer areas. The fungal spores need to be immersed in water for a number of hours in order to germinate so doing everything possible to reduce moisture on the leaves and improve air circulation is important.
Suggested Organic Strategies:
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Remove any black spot damaged leaves as they appear and pick up any on the ground, a pair of long tongs is good for this, as black spot can over-winter in the fallen leaves.
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Mulching acts as a barrier and helps restrict the spread of fungal spores from the soil onto the plant.
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eco-rose is an organically certified fungicide to control this disease.
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Lime sulphur can be used as a preventative fungicide on leafless roses in winter. A deficiency of potassium makes roses more vulnerable to this disease so add 150 g per plant of sulphate of potash in spring, summer and autumn.
More information on organic rose care.…
More information on organic fungal control.…
Suggested Products:
Lime Sulphur
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