Euxesta thomae

Euxesta thomae is a fly species belonging to the family Ulidiidae. Often referred to as a picture-winged fly, this insect is recognized as a significant pest in agricultural settings, particularly where maize and various horticultural crops are grown in warm or tropical environments.

The primary hosts for Euxesta thomae include sweet corn, where it infests the ears, as well as various vegetables like tomatoes, peppers, and cucumbers. The flies are attracted to plant volatiles released from damaged tissues or fermenting plant parts, which serve as sites for oviposition.

The life cycle consists of egg, larval, pupal, and adult stages. Females lay their eggs in groups within the silks or under the husks of corn ears. The larvae are the damaging stage, burrowing into the kernels or fruit flesh and consuming the plant tissue, which creates tunnels that facilitate rot.

Damage caused by this pest is characterized by severe degradation of the crop. Infested ears of corn often show discolored, necrotic kernels and are susceptible to fungal colonization. In vegetables, internal feeding results in softened, spoiled fruit that loses all marketability and nutritional value.

Integrated pest management (IPM) is essential for effective control.

• Implement crop rotation to break the pest cycle.
• Apply targeted insecticide treatments during the silking stage of corn.
• Maintain proper field sanitation by removing crop residues after harvest.
• Monitor adult populations using bait traps to time interventions precisely.