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This is for next year. :hobbyhors

I've read that if you put down a fresh layer of mulch under the roses in the spring, it prevents the black spot spores from splashing up onto the leaves from rain or watering. I just happened to do that this year without reading that tip and sure enough it worked!
 

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Avoid overhead watering. Improve air circulation. Remove damaged leaves as they appear. Use oat straw as a mulch. It sometimes occurs as a result of potassium deficiency.

CONDY’S CRYSTALS SPRAY FOR BLACK SPOT ON ROSES:
Spray on a solution of 1 litre skim milk, 1 litre soapy water and a pinch or two of Condy’s crystals (potassium permanganate). Reapply about every two weeks.
OR
Mix together 1 litre skim milk, 1 litre soapy water and 1-2 pinches Condy ‘s crystals. Use as a spray about every 2 weeks.
OR
Mix 3 tablespoons of bicarbonate of soda into 4 litres water and spray the roses. Gather up and dispose of any fallen leaves.
 
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