What are black spots on onions and why are they caused?

Black spots on onions are usually a result of fungal infections like Alternaria or Aspergillus.

These fungi thrive in warm, humid environments, affecting onions during storage or in the field.

The black spots are caused by the fungus breaking down the onion's tissues.

The infected onion may become soft and start rotting, making it unsuitable for consumption.

Poor storage conditions, such as excessive moisture or improper ventilation, encourage fungal growth.

Onions with black spots are still safe to eat if the affected areas are removed and the onion is otherwise firm.

These black spots may also appear due to physical damage, which can create an entry point for fungi.

To avoid black spots, store onions in a cool, dry place with good airflow.

This information is not DNA's opinion but obtained from media reports