Its Botrytis blight (Botrytis cinerea).
The Diseases incidence level very high when humidity rate is increased.
Management
- Maintain proper space and aeration in plot
- Reduced rate of application of nitrogenous fertilizer.
- Remove infected fruits and and plant from the field.
- Increase rate of application of potassium fertilizer.
- Spray Sulphur 80% WP @ 40 g + carbendezim 50% WP@30g/15 liters of water.