Ancylonotus tribulus

Ancylonotus tribulus is a wood-boring beetle belonging to the family Cerambycidae (longhorn beetles), order Coleoptera. This species is recognized as a significant agricultural pest, particularly in African tropical regions, where it poses a direct threat to the vitality and productivity of tree-based crops.

The primary hosts for this pest include cacao (Theobroma cacao) and coffee (Coffea spp.). By boring into the stems and branches of these economically important crops, the beetle larvae compromise the tree's structural integrity and its ability to transport nutrients and water from the soil to the foliage, which can lead to significant yield losses or total plant death.

The biology of Ancylonotus tribulus is characterized by a cryptic larval stage. Adult females lay eggs on the bark, and upon hatching, larvae tunnel into the cambium and xylem layers. They remain inside the wood for several months, completing their development within the tree, which makes them highly resistant to environmental stressors and conventional surface sprays.

The damage caused by this pest is often visible through the presence of frass (boring dust) accumulating at the base of the tree or in branch forks, alongside stunted growth, yellowing foliage, and structural weakness. These entry points also serve as gateways for opportunistic fungal infections and can lead to branch breakage during heavy winds.

Effective management requires an integrated approach to pest control. Recommended strategies include:

• Regular field scouting to detect initial signs of infestation;
• Mechanical removal and destruction of heavily infested plant parts;
• Proper pruning to improve air circulation and tree vigor;
• Targeted application of insecticides to tree trunks to control adult beetles during their emergence periods.