Coffee white stem borer

Xylotrechus quadripes, commonly known as the coffee white stem borer, is a destructive coleopteran insect belonging to the Cerambycidae family. This beetle is notorious for causing massive damage to coffee plantations, particularly in Asia, where it acts as a primary pest capable of killing entire trees.

The host range is primarily limited to Coffea species. The larvae are the stage responsible for the damage; they tunnel deep into the heartwood of the coffee stems. This activity severely disrupts the vascular system, preventing the transport of water and nutrients, which inevitably leads to the decline and death of the plant.

The life cycle begins when an adult female deposits eggs in the crevices of the coffee bark. After hatching, the larvae bore into the sapwood and eventually the heartwood, creating extensive galleries. This developmental phase lasts several months, after which the insect pupates inside the wood before emerging as a mature beetle.

Damage is often identified by the wilting and chlorosis of leaves, followed by the death of branches or the entire tree. Characteristic exit holes on the stem and the presence of fine wood dust at the base of the plant are standard diagnostic features that indicate a serious infestation requiring immediate intervention.

• Upgrading plantation hygiene by pruning and burning infested branches.
• Scrubbing the main stem of coffee plants to remove moss and loose bark where eggs are laid.
• Applying systemic or contact insecticides during peak beetle emergence.
• Maintaining proper shade levels to prevent sun-scorch, which attracts the beetles.
• Regular monitoring using pheromone traps to time pesticide application effectively.