Step 1:
You will need
* Secateurs
* pesticide and fungicide spray
Step 2:
Identify the disease
The symptoms of black spot are small round black patches, ranging from 1 millimetre to 1 centimetre, on the upper side of the leaf. The tissue around the spots turns yellow, and the leaves fall prematurely.
Step 3:
Cultural control
As soon as you see any signs of black spot, remove the infected leaves with the secateurs or by hand. Gather all the debris from around the base of the plant too. Burn the leaves and debris or throw them away - never put them in the compost heap as this will spread the disease.
Do this throughout the year, whenever black spot occurs
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