Strawberries can appear fluffy due to a fungal infection called gray mold, or Botrytis fruit rot.
Understanding Gray Mold on Strawberries
Gray mold, caused by the fungus Botrytis cinerea, is a common disease that affects strawberries. While not all strawberries are actually fluffy, the appearance of a fuzzy or cottony growth is a key indicator of this infection.
How Gray Mold Develops
- Initial Infection: The fungus can infect strawberries at any stage, even during flowering.
- Visible Symptoms: The first signs are often soft, light brown spots on the fruit.
- Fuzzy Growth: As the infection progresses, a gray, fuzzy mold develops on the surface of the berries. This is the characteristic "fluffy" appearance.
- Spread: The mold releases spores that spread to other berries, especially in humid conditions.
Factors Contributing to Gray Mold
Several factors increase the risk of gray mold in strawberries:
- High Humidity: Humid environments favor fungal growth.
- Poor Air Circulation: Densely planted strawberries with limited airflow are more susceptible.
- Damaged Fruit: Injuries to the fruit, even minor ones, provide entry points for the fungus.
- Overripe Fruit: Decaying fruit provides a breeding ground for Botrytis cinerea.
Prevention and Control
Preventing and controlling gray mold requires good garden hygiene and proper care:
- Proper Watering: Avoid overhead watering, which wets the foliage and fruit. Use drip irrigation instead.
- Good Air Circulation: Space plants adequately to promote airflow.
- Remove Infected Fruit: Promptly remove and discard any infected berries to prevent the spread of spores.
- Yearly Renovation: Renovate strawberry beds annually to remove old foliage and improve air circulation.
- Fungicides: In severe cases, fungicides may be necessary, especially during flowering. Consult your local agricultural extension office for recommendations.
In summary, strawberries appear "fluffy" because of the growth of Botrytis cinerea, the fungus that causes gray mold. Implementing proper gardening practices can significantly reduce the risk of this infection.
