Home Fruit Gardening Stylar End Rot in Citrus Fruits: Prevention and Management

Stylar End Rot in Citrus Fruits: Prevention and Management

by Gregory
3 minutes read

Stylar End Rot: A Disease Affecting Citrus Fruits

Citrus fruits, like navel oranges and lemons, can be affected by a disease called stylar end rot, also known as black rot. This disease can cause the stylar end, or navel, of the fruit to crack, discolor, and decay.

What Causes Stylar End Rot?

Stylar end rot is caused by a pathogen, which is a type of fungus. The fungus can enter the fruit through cracks or damage in the stylar end. Once inside, the fungus spreads and causes the fruit to rot.

There are several factors that can contribute to the development of stylar end rot, including:

  • Unhealthy or stressed citrus trees
  • Poor growing conditions, such as lack of sunlight or water
  • Over-ripening of fruit on the tree

Symptoms of Stylar End Rot

The symptoms of stylar end rot can vary depending on the stage of the disease. In the early stages, the fruit may start to change color prematurely. As the disease progresses, darker spots may appear at the stylar end of the fruit. If the fruit is cut open, the rot may be visible as a brown or black discoloration that penetrates deep into the fruit.

Preventing Stylar End Rot

Once stylar end rot has infected a fruit, it is too late to save it. However, there are steps that can be taken to prevent the disease from occurring in the first place. These steps include:

  • Providing healthy growing conditions for citrus trees: This includes ensuring the trees have well-drained soil, plenty of sunlight, and adequate water.
  • Managing stress in citrus trees: Stress can weaken trees and make them more susceptible to disease. Stressors can include drought, pests, and diseases.
  • Harvesting fruit at the right time: Over-ripening of fruit on the tree can increase the risk of stylar end rot.
  • Using fungicides: Fungicides can be used to prevent the growth of the fungus that causes stylar end rot. However, it is important to note that fungicides should only be used as a last resort, as they can have negative effects on beneficial insects and the environment.

Stylar End Breakdown in Limes

A similar condition to stylar end rot can occur in limes. This condition is not caused by the same fungus, but rather by over-ripening of the fruit on the tree. The symptoms of stylar end breakdown in limes are similar to those of stylar end rot, including discoloration and decay of the stylar end of the fruit.

To prevent stylar end breakdown in limes, it is important to harvest the fruit when it is ripe but not over-ripe.


Stylar end rot is a disease that can affect citrus fruits, causing significant damage and loss of fruit. By understanding the causes and symptoms of stylar end rot, and by taking steps to prevent the disease, growers can protect their citrus crops and ensure a healthy and productive harvest.

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