Black fruit fly

Systematic position: The black fruit fly Trirhithrum nigerrimum belongs to the family Tephritidae, order Diptera. This insect is recognized as a significant pest within its geographic range, impacting the quality and quantity of fruit production in various tropical and subtropical agricultural systems.

Host crops: This pest primarily targets fruits of plants within the Rubiaceae family, with species of the genus Coffea being key hosts. However, it can infest a broader range of fruit-bearing plants depending on availability and ecological suitability, making it a concern for diverse horticultural practices.

Biology and life cycle: The life cycle encompasses egg, larval, pupal, and adult stages. Females insert their ovipositor into ripening fruit to deposit eggs. The hatching larvae feed on the fruit pulp, causing structural damage. After completing their development, larvae typically exit the fruit to pupate in the soil, emerging later as adult flies to restart the cycle.

Character of damage and harmfulness: The larval feeding activity inside the fruit creates tunnels, leading to tissue degradation and premature fruit drop. These damaged fruits are susceptible to rapid rot caused by secondary pathogens, rendering the produce unmarketable and causing significant economic losses for commercial growers.

Control measures: Management of Trirhithrum nigerrimum relies on an integrated approach to minimize crop losses:

• Regular collection and destruction of fallen fruit to disrupt the pest's life cycle.
• Implementation of pheromone and bait traps for monitoring and reducing adult populations.
• Application of appropriate insecticides during peak flight periods of the adults.
• Maintaining field hygiene to prevent the accumulation and spread of the infestation.