The small white organisms sometimes seen emerging from strawberries are often identified as larvae of the spotted wing drosophila, a species of fruit fly.
Unlike many fruit flies that lay eggs only on overripe or damaged fruit, spotted wing drosophila females can pierce the skin of healthy, ripening fruit and deposit their eggs inside.
Once the eggs hatch, tiny larvae begin developing within the fruit, often remaining hidden from view.
Because of their size and the fruit's structure, consumers may not notice them until the strawberries are washed or soaked.
How Do Larvae End Up Inside Strawberries?
The process begins while the fruit is still growing.
Adult flies use a specialized egg-laying structure to place eggs beneath the surface of soft fruits. As the fruit continues to ripen, the larvae develop inside.
Fruits commonly affected may include:
- Strawberries
- Raspberries
- Blackberries
- Blueberries
- Cherries
- Grapes
- Other soft-skinned fruits
In many cases, the fruit may still look fresh and appealing from the outside.