Drosophila paulistorum

Drosophila paulistorum is a species of fruit fly belonging to the Drosophilidae family (order Diptera), recognized in agricultural entomology as a significant pest of fleshy fruits. This species is particularly noted for its complex genetic structure and its ability to thrive in various tropical and subtropical ecosystems, posing a constant challenge to commercial fruit production.

The primary hosts for this fly include a variety of fruits, ranging from berries to larger pomaceous fruits. The damage is primarily caused by the larvae, which feed internally on the fruit flesh. This feeding behavior not only destroys the fruit texture but also introduces yeasts and bacteria that accelerate decomposition, making the affected fruits unmarketable and susceptible to rot.

The life cycle of this species is optimized for rapid colonization. Adult females locate suitable hosts through volatile organic compounds emitted by ripening fruits. After laying eggs beneath the skin, the larvae develop quickly, utilizing the fruit's sugars as their main energy source. Under optimal temperature and humidity, multiple generations can emerge within a single growing season.

The economic impact is manifested through direct yield loss and increased costs for sorting and handling infected produce. Because the infestation often starts before harvest, it can lead to high percentages of damaged fruit at the packing house level. Monitoring the population density is essential to mitigate these losses and prevent widespread contamination within an orchard.

Effective management requires an Integrated Pest Management (IPM) approach:

• Strict sanitation practices, such as the rapid removal of fallen and overripe fruits.
• Deployment of bait traps containing attractants to monitor and reduce adult populations.
• Implementation of harvest schedules that minimize the time fruit remains susceptible in the field.
• Targeted application of insecticides only when threshold levels are exceeded.