Willow leafroller

Systematic position. The willow leafroller (Latin: Ancylis biarcuana) belongs to the order Lepidoptera, family Tortricidae. This insect is a specialized feeder primarily associated with plants of the Salix genus, making it a notable pest in specific silviculture and landscaping contexts.

Host plants. The primary hosts for this species are various willow trees and shrubs. It is frequently observed in willow plantations, commercial nurseries, and urban environments where willow species are planted for ornamental purposes or erosion control.

Biology and life cycle. The species undergoes a complete metamorphosis. The life cycle involves egg, larval (caterpillar), pupal, and adult (moth) stages. Moths typically emerge in the spring, laying eggs on the undersides or surfaces of willow leaves. The larvae develop throughout the summer, constructing shelters by rolling and binding leaves together with silk.

Damage and economic impact. The larvae are the main destructive stage. They feed on the leaf parenchyma, causing the leaves to roll into tubes or dense clusters. Significant infestations lead to severe defoliation, stunted growth of willow shoots, and reduced photosynthetic efficiency, which ultimately impacts the tree's health and aesthetic value.

Management strategies. Effective control requires an integrated approach. Cultural methods include the physical removal and destruction of infested leaf rolls during the early stages of infestation. Chemical control using selective or systemic insecticides is recommended during the larval emergence period. Additionally, encouraging natural predators, such as parasitic wasps and predatory birds, can help keep population densities below economic damage thresholds.