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    Rose black spot [Diplocarpon rosae]

    Roses infected at harvest cannot be marketed.

    overview

    Rose black spot - image 1

    Rose black spot - image 1

    Pest Profile

    • Symptoms & Diagnosis

      Occurence

      Rose black spot occurs only on roses. Plants are particularly at risk when there is poor ventilation and prolonged leaf wetness.

      Pattern of damage

      Irregular, dark, roundish to star-shaped spots on the top surface of leaves (Picture 1). The leaves yellow and detach upon being touched.

      Treatment

      Combat

      Fallen leaves must be removed from the rose growing area. Sufficient ventilation to ensure wet leaves can dry quickly. Preventative chemical treatment should be performed in order to stop sporulation.