Symptoms

• Dark brown collapsed lesions, with a purple tinge.
• Black specks develop in decayed area.

Early stage	Dark brown collapsed lesions	Black spots

Occurrence

Mainly inland citrus regions.
• Infection occurs in autumn but remains dormant until cool conditions.
• Fruit more susceptible after frosts.

Management

• Field application of copper-based fungicides.

Image source: http://www.idtools.org/id/citrus/diseases/factsheet.php?name=Septoria