Taiwanese beetle

Systematic position: The Taiwanese beetle (Popillia taiwana) belongs to the order Coleoptera and the family Scarabaeidae. This species is a significant agricultural pest closely related to the Japanese beetle. Due to its feeding habits, it can cause substantial economic losses in both agricultural and horticultural settings.

Host plants: This pest is highly polyphagous, meaning it feeds on a wide variety of plants. Common hosts include fruit trees, grapevines, ornamental shrubs, and several broad-leaved crops. The ability to switch between different host plants throughout the growing season makes management particularly challenging for farmers.

Biology and lifecycle: The lifecycle consists of egg, larval, pupal, and adult stages. Eggs are deposited in the soil, where larvae develop by consuming root systems. After pupation, adults emerge to feed on foliage and flowers. The duration of each stage is heavily dependent on local temperature and soil moisture conditions.

Damage characteristics and economic impact: Adults typically skeletonize leaves by feeding between the veins, eventually consuming the entire leaf blade. In cases of high infestation, this can lead to severe stress and stunted growth in plants. Larval feeding on roots inhibits nutrient and water uptake, which often results in the death of young seedlings or weakened plants.

• Monitoring populations using pheromone or light traps.
• Application of biological control agents like entomopathogenic nematodes.
• Soil cultivation to disrupt larval development and reduce soil-borne populations.
• Targeted insecticide applications during the adult flight period to prevent widespread defoliation.
• Implementing integrated pest management (IPM) strategies to ensure long-term control.