The Problem

Petal Blight

Ovulinia sp.

What is Azalea Petal Blight?

Azalea Petal Blight is a fungal disease of flowers and is particularly well known for attacking azalea flowers.
The condition worsens in wet, cool weather during flowering. The spores of the disease can be spread
by wind up to 20 km and so the disease moves from plant to plant in the garden. Petal blight is more
prevalent in varieties with double blooms. Once the disease has started on your plant, it is difficult to stop.
The best defence is to remove all damaged flowers as soon as possible so the fungal spores do not spread
throughout the garden. If you have had the disease in previous years then a preventative fungal spray is
needed as soon as the buds begin to show colour on your bushes.

What are the symptoms?

The disease starts as pale marks on coloured petals and brown marks on white petals. The spots enlarge
rapidly and by the end of the day, the whole flower has collapsed into a brown, mushy mess. Affected
flowers may hang on the bush.

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