Palm weevil Dynamis borassi

Systematic position: this insect belongs to the order Coleoptera and the family Curculionidae (true weevils). Dynamis borassi is a specialized pest known for its significant impact on palm trees in tropical regions.

Host crops: the primary hosts are various species within the Arecaceae family. Economically important plants such as the coconut palm (Cocos nucifera) and the oil palm (Elaeis guineensis) are among the most frequent targets for infestation.

Biology and life cycle: the life cycle consists of four stages: egg, larva, pupa, and adult. Females deposit eggs into soft palm tissues. Upon hatching, larvae burrow into the trunk, consuming the internal vascular tissues, which leads to structural damage that can destabilize the palm.

Damage and pest status: the larvae are the primary source of damage, as their feeding behavior creates galleries inside the trunk and terminal buds. This infestation eventually leads to the collapse of the palm crown and the death of the entire plant, making it a critical threat to palm plantations.

Control measures: managing this pest is difficult due to the internal nature of the damage. Recommended practices include:

• Regular field scouting to identify and remove infested trees promptly.
• Implementation of pheromone traps to monitor and reduce adult weevil populations.
• Sanitation by destroying palm debris where adults might breed.
• Systemic insecticide treatments via trunk injections or canopy spraying in specific high-risk scenarios.