Great oak longhorn beetle

The great oak longhorn beetle (Hoplocerambyx spinicornis) is a significant wood-boring insect belonging to the family Cerambycidae, order Coleoptera. Known as a primary pest, it has the ability to infest healthy trees, causing severe economic losses in timber production and ecological disruption in natural hardwood forests.

The primary hosts of this beetle are various species of oak (Quercus). However, it exhibits a wide range of host plants in its distribution area, significantly impacting timber-producing tree species, particularly in regions across Asia where it is a notorious forest pest known for rapid and destructive spread.

The beetle's life cycle typically lasts one to two years. Eggs are deposited into bark crevices, where larvae emerge and immediately tunnel into the cambium and subsequently deep into the sapwood and heartwood. The larvae spend most of their development inside the tree, creating extensive, winding galleries that compromise the structural integrity of the wood.

The damage caused by the larvae is severe and often fatal to the tree. As larvae feed, they create large boreholes and galleries that disrupt water and nutrient transport. Infested trees usually show symptoms of crown decline, epicormic branching, and eventually die. The presence of wood dust (frass) at the base of the trunk is the most common diagnostic sign.

Management and control strategies focus on prevention and sanitation:

• rigorous forest sanitation through the removal of infested trees before adult emergence;
• use of pheromone-baited traps to capture and monitor adult populations;
• chemical control applied to tree trunks during the adult flight period;
• promoting biodiversity in forest stands to encourage natural predators, such as woodpeckers.