Willow weevil

Lepyrus palustris, commonly referred to as the willow weevil, is a beetle species belonging to the family Curculionidae (order Coleoptera). As its scientific name implies, it is typically associated with wetland environments, where it finds optimal conditions for survival and reproduction on its host plants.

This pest primarily attacks various species within the Salicaceae family, particularly willows and poplars. In agricultural or forestry settings, the weevils are known to infest nursery stock and shelterbelts, potentially causing significant economic losses if the population density is high enough to damage the foliage and woody parts of the plants.

The life cycle of the willow weevil involves overwintering as adults in protected locations such as soil crevices or leaf litter. With the arrival of spring, they emerge to feed on developing buds and young shoots. This emergence timing is critical for pest monitoring, as it is the period when the insects are most vulnerable to control efforts.

The damage caused by Lepyrus palustris is characterized by irregular notches along the leaf margins, often referred to as edge-feeding. Adults also feed on tender bark, which can lead to the wilting of terminal shoots. Persistent feeding impacts the photosynthesis capacity of the host and can stunt the growth of young trees.

Management strategies for this pest include a combination of cultural and chemical interventions. Maintaining clean cultivation areas by removing debris and weeds helps reduce overwintering sites. In severe infestations, the application of targeted insecticides during the active feeding phase of the adults is the most effective approach to protect the crops.