Why can fruit flies cause serious damage to fruit crops?

Fruit flies, particularly those in the family Trypetidae, cause serious damage to fruit crops primarily because their larvae feed directly within the flesh of the fruit.1

The damage occurs through several key processes:

• Egg-laying: Adult females use a specialized organ called an ovipositor to puncture the skin of developing fruit and deposit hundreds of eggs inside.12
• Tunneling: Once hatched, the larvae tunnel through the fruit's interior. This feeding activity causes the flesh to become spongy, discolored, and prone to internal decay.12
• Loss of Marketability: This internal destruction makes the fruit unfit for human consumption, leading to significant economic losses for farmers.12
• Premature Drop: Infested fruits often fall from the tree prematurely, further reducing harvest yields.2

Because these insects can devastate agricultural production, their presence has necessitated the formation of worldwide quarantine laws to regulate the movement of fruits between countries. Control methods often involve orchard sanitation, the use of sticky traps, and the application of insecticides during the egg-laying season.12