Botrytis

Botrytis is transmitted when the light intensity is low and the humidity high.

Symptoms

  • Black or brown spots on petals.
  • Die back of soft stems.
  • Die back from wounds caused by harvesting or pruning.
Botrytis   Botrytis2

Control

  • Do not harvest rose stems more than a centimetre above an eye (die back will occur if harvested too high above an eye).

  • Do not prune if the growth medium is wet.

  • Spray with fungicides registered for Botrytis on roses (spray in the morning).

  • Do not spray fungicides or water on the flowers during the afternoon.

  • Do not irrigate from above when it is cloudy and cool.

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