Metallic fruit fly

Lamprolonchaea brouniana is a member of the family Lonchaeidae within the order Diptera. Known colloquially as a type of metallic fruit fly, this insect is recognized as a significant agricultural pest that targets the reproductive structures of a wide range of plants, causing substantial yield losses in commercial fruit production.

The host range of this pest is extensive, impacting crops such as passion fruit, citrus varieties, tomatoes, and various other tropical and subtropical fruits. The economic importance of this pest lies in its ability to compromise both the quality and quantity of marketable produce, often leading to total crop rejection by exporters.

The biological cycle involves the female fly ovipositing into the developing fruit. Upon hatching, the larvae immediately tunnel into the fruit tissue. This endophagous feeding habit protects the larvae from external environmental factors and many contact insecticides, making timing crucial for any control intervention.

Damage symptoms are characterized by internal tissue breakdown, larval galleries filled with frass, and rapid decay due to secondary infections by saprophytic fungi and bacteria. Infested fruits frequently drop prematurely, and even those that remain on the plant often exhibit dark, sunken spots where the larvae have penetrated.

Effective management requires an integrated approach. Sanitation is paramount: regular removal and deep burial or destruction of fallen fruit helps break the life cycle by killing developing larvae. Additionally, monitoring with bait traps helps time the application of biorational or chemical insecticides to target the adult stage before they can oviposit.