Black Spot Control
© Frances Michaels
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
More information on suggested rose care...
More information on organic fungal
- 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.
- Mulching acts as a barrier and helps restrict the spread of fungal spores from the soil onto the plant.
- Eco-Fungicide is an organically
certified fungicide to control this disease.
- 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.