Tropical and subtropical fruits (2+1)

Granulation

Mosambi, Hamlin and blood red cultivars are mostly affected by this disorder. Granulation is drying up, becoming hard with greyish colour and enlargement of the juice vesicles with increase in pectin, lignin, etc. resulting in reduction of the juice content. This occurs more in young vigorous trees than old trees.

Factors affecting granulation are:

• Climate (humid)
• Cultivars
• Rootstocks
• Mineral nutrition
• Enzymes and plant growth regulators
• Crop load
Control

• No successful method, but the following can be tried as remedies.
• Spraying lime, Znso4, Bordeaux mixture or Znso4 + Cuso4 (0.5%).
• Early picking
• Reduced irrigations
• Spraying 200-500 ppm lead arsenate