Larinus meleagris

Systematic position: Larinus meleagris belongs to the order Coleoptera, family Curculionidae. It is a specialized phytophagous insect closely associated with plants from the Asteraceae (Compositae) family, particularly those within the genera Carduus, Cirsium, and Centaurea.

Host plants and damage: While this pest rarely infests major field crops, it poses a significant threat to ornamental seed production and native species of the Asteraceae family. The larvae are primary seed predators, destroying the developing seeds within the flower heads, which drastically reduces yield.

Biology and life cycle: The insect's life cycle is synchronized with the flowering phenology of its host plants. Adults overwinter in the soil or under plant debris. In spring, they emerge and begin feeding on leaves and stems before mating. Females deposit eggs directly into the buds or immature flower heads, where the larvae complete their development.

Damage patterns: The primary economic damage is caused by the larval stage, which feeds on the internal tissues and ovules of the flower. This feeding behavior effectively sterilizes the seed head. Adult weevils also cause minor damage by feeding on foliage, leaving small, irregular holes, which can stress the plant during periods of low moisture.

Control measures: Management of this pest involves a combination of cultural and chemical strategies. Key recommendations include:

• Mowing or removing host weeds before seed maturity to interrupt the larval development cycle.
• Deep autumn tillage to disrupt overwintering sites for adult beetles.
• Applying systemic insecticides during the budding stage if pest populations exceed the economic threshold.