Andean potato weevil

Systematic position: Rhigopsidius (most notably Rhigopsidius tucumanus) is a genus of weevils belonging to the family Curculionidae, order Coleoptera. These insects are significant agricultural pests, particularly recognized as quarantine organisms in several potato-producing regions globally.

Crops affected: The primary host plant is the potato (Solanum tuberosum). The larvae are specifically adapted to tunnel into potato tubers, making them a destructive threat to both commercial potato yields and stored seed potatoes in high-altitude environments.

Biology and life cycle: The life cycle comprises egg, larval, pupal, and adult stages. Adult weevils typically emerge from the soil to feed on potato foliage at night. Females deposit eggs in the soil near the host plant. Once hatched, the larvae penetrate the developing tubers to feed and mature, completing their development inside the potato.

Damage and pest status: The economic impact is severe. Larval feeding creates irregular, excrement-filled tunnels within the tuber, which structurally weakens the potato and facilitates the entry of secondary pathogens, such as bacteria and fungi, leading to widespread tuber rot during storage and harvest.

• Strict enforcement of quarantine and phytosanitary regulations on imported tubers.
• Utilization of certified, pest-free seed potatoes to prevent initial field colonization.
• Implementation of crop rotation cycles to disrupt the weevil's life cycle.
• Application of soil-active insecticides during the planting season to prevent larval entry.
• Post-harvest deep tillage to expose larvae and pupae in the soil to predators and environmental stress.