Chinese longhorn beetle

Systematic position: The Chinese longhorn beetle (Xylotrechus chinensis) belongs to the order Coleoptera and the family Cerambycidae. This species is recognized as a significant invasive wood-boring pest that has caused serious ecological and economic concerns in various regions where mulberry trees are cultivated.

Crops damaged: The primary host plant for this beetle is the mulberry tree (Morus spp.). While it has been observed on some other tree species, its affinity for mulberry makes it a specific threat to sericulture and landscape gardening. The larvae tunnel deep into the tree's internal structures, causing irreparable harm to the plant.

Biology and lifecycle: The lifecycle typically spans one year. Adult beetles emerge during the summer months, and mating occurs shortly thereafter. Females deposit their eggs into crevices in the bark. Upon hatching, the larvae immediately bore through the bark and begin feeding on the cambium and inner wood, creating complex tunnel networks where they eventually pupate.

Damage and pest status: The pest is highly destructive due to the feeding habits of its larvae. By tunneling into the tree, they disrupt the vascular system responsible for water and nutrient transport. Infested trees show symptoms such as branch dieback, yellowing foliage, and structural weakness, ultimately leading to tree death if the infestation is heavy and left unmanaged.

Protection measures: Managing Xylotrechus chinensis is challenging due to the internal development of the larvae. Prevention and early detection are key strategies:

• Implementing strict quarantine regulations for the movement of mulberry wood and nursery stock.
• Regular monitoring of plantations using pheromone-based traps to track adult population spikes.
• Sanitation, which includes the removal and destruction of infested branches or entire trees.
• Applying targeted insecticide treatments on the bark surface during the peak flight season to prevent egg-laying.
• Maintaining tree vigor through proper fertilization and watering to improve natural resistance.