Dacus umehi

Systematic position: Dacus umehi belongs to the order Diptera and the family Tephritidae. This species is a significant pest of tropical and subtropical fruit crops, causing substantial economic losses in the agricultural sector, particularly within regions of West Africa.

Host crops: The primary food sources for the larvae of this insect are the fruits of plants belonging to the Cucurbitaceae family. Specifically, the pest infests cucumbers, zucchini, pumpkins, and various wild cucurbit species, drastically reducing both the market quality and the total volume of the harvested produce.

Biology and life cycle: The life cycle of this pest follows the standard development pattern for the Tephritidae family. Females deposit eggs inside immature fruits by piercing the skin with their ovipositors. Upon hatching, the larvae feed extensively on the fruit pulp. Once the larval stage is completed, the insect drops into the soil to pupate, eventually emerging as an adult to mate and restart the cycle.

Damage and pest status: The primary damage is caused by larvae tunneling through the fruit. This activity leads to tissue decay, premature fruit drop, and total unsuitability for consumption or processing. Secondary infections by bacteria and fungi, which enter through the larval entry points, cause the fruits to decompose rapidly and become putrid.

Control measures: An effective management strategy requires an integrated approach. Key methods include:

• collecting and destroying fallen fruit to prevent pupation;
• using pheromone traps for population monitoring and mass trapping of males;
• applying insecticides during the early stages of infestation;
• practicing crop rotation and eliminating wild weed hosts that act as reservoirs for the pest.