First blackspot of season found today. Disappointing: Already been sprayed with a systemic (moves around within plant) combined insecticide/fungicide ('RoseClear 3').Bush is in a damp dark corner, so cannot expect too much. Sprayed all roses with 'Dithane', especially around base of plant and soil surface. Seems to produce better results.
As usual, this disease has first appeared on the lower leaves, probably because spores have splashed up from soil surface, where they over-winter.
Blackspot is not really serious - except cosmetically - Plants look bad. Removing lower leaves has no effect and is not noticed. It's when it gets half-way up stem that things become serious.
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