Navel Orange Fruit Splitting and Rot: Water Stress

Southern California Navel Oranges Cracking and Rotting

Oranges cracking open and rotten on tree. Owner saddened.

Causes

• Normal fruitlet drop after bloom and at pea size.
• Summer drop (20mm fruit) from heat/water stress—severe in young navels.
• Root diseases, nitrogen/trace element deficiency.

Key Factor

Lack of water at/after fruit set is primary suspect. Ensure consistent deep watering.