Dept of Agriculture Development 
SFAC KeralaThe main symptom of a leaf spot disease is spots on foliage. The size, shape, colour and form of the leaf spot vary in accordance with the causal organisms. Over time, the spots may combine or enlarge.
The affected leaves become yellow and drop prematurely. In papaya the symptoms are also seen on fruits. The affected fruits showed small irregular black spots, which later on coalesce, into big spots. (C.0: Cercospora papayae)
The diseased leaves and fruits should be collected and destroyed. Spray Mancozeb 75 WP (3 gram/litre of water) or Copper oxychloride 50 WP (2 gram/litre of water) or Bordeaux mixture 1%.
