Wormwood weevil

Systematic position: The wormwood weevil (Ceutorhynchus cinnamomeus) belongs to the order Coleoptera and the family Curculionidae. It is a specialized pest that maintains a close biological association with plants of the Asteraceae family, particularly the genus Artemisia (wormwood).

Host plants and economic impact: The primary hosts are various species of wormwood. While it is rarely a threat to major cereal crops, it poses a significant risk to the production of medicinal herbs and essential oil crops. The pest reduces the overall biomass and the concentration of active compounds in affected plants.

Biology and life cycle: The species undergoes a complete metamorphosis, including egg, larva, pupa, and adult stages. Overwintering typically occurs in the adult stage within the soil or ground cover. As temperatures rise in spring, the adults emerge to feed on foliage before mating and ovipositing into plant tissues.

Nature of damage: Larvae are the primary cause of damage, as they bore into stems and flower heads to consume internal tissues. This activity creates tunnels, leads to stunted growth, wilting, and in severe cases, the complete abortion of flower development. The feeding marks of adults on leaves are less destructive but can facilitate pathogen entry.

Control measures: Integrated pest management relies on cultural practices such as crop rotation and the removal of alternative host plants from field margins. Mechanical soil disturbance, such as autumn plowing, effectively destroys pupae. Chemical control using systemic insecticides is applied only when pest populations exceed economic thresholds during the active vegetation period.