Rhizopus rot: Rhizopus stolonifer

Symptoms:

• Irregular, water-soaked lesions which gradually enlarge and get covered by white and dark brown fungal growth and sporangiophores.  
• The fruits become watery and emit a foul odour.
• Papaya orchard and storage room are sources of inoculum.
• Invasion occurs through wounds.
• The rots rapidly destroys the entire fruit and quickly spreads to other fruits.
• Fruit fly punctures after harvest increase the disease incidence

Management:

• The disease can be checked by sorting the fruit at 100C or below but the rot appears after 2-3 days when such fruits are brought back to 200 C or above.
• The disease can be controlled with DCNA dips at 1000-2000 ppm
• Hot water treatment of fruits at 490C for 20 minutes can check the rot.

Image source: http://www.ctahr.hawaii.edu/nelsons/papaya/1_rhizopus_thru_anthracnose_papaya.jpg