Hornet moth

The hornet moth (Aegeria crabroniformis) is a wood-boring pest belonging to the Sesiidae family in the order Lepidoptera. Its common name is derived from its striking resemblance to the hornet (Vespa crabro), a classic example of Batesian mimicry that serves as a protective mechanism against predators.

The primary hosts of this species include various willow (Salix) and poplar (Populus) species. It is considered a significant pest in nurseries, young forest plantations, and urban landscape areas where the health and aesthetic value of trees are of primary concern.

The biology of the hornet moth is characterized by a two-year life cycle. Adults emerge during the summer months, and females deposit eggs near the base of the host tree, often in bark crevices or wounds. Upon hatching, larvae immediately bore into the bark and eventually penetrate the woody parts of the trunk or root system.

Damage caused by this pest is primarily internal, involving the excavation of extensive galleries in the sapwood and heartwood. This activity significantly compromises the structural integrity of the tree, making it vulnerable to windthrow and slowing down nutrient transportation, which can result in long-term decline or sudden death of the host.

To effectively mitigate the impact of the hornet moth, an integrated pest management strategy is required:

• Regular inspection of host trees to detect early signs of infestation such as frass deposits.
• Prompt removal and destruction of heavily infested trees to prevent the emergence of a new generation.
• Maintenance of tree vigor through proper silvicultural practices to reduce susceptibility to borers.
• Application of contact insecticides during the short window when adult moths emerge and mate.