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You asked:

What is causing black mould on the leaves of my Bougainvillea?

Our Advice:

This is could be aphids or (more likely) mealy bugs or scale insects feeding and excreting sweet honeydew onto the leaves, where the sooty mould grows on it. Control these pests with Bug Clear Ultra from Scott's or Resolva Bug Killer from Westland. Once they have gone, the sooty mould should gradually disappear.

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