Poplar wood moth

The poplar wood moth (Acossus populi) is a moth species belonging to the order Lepidoptera and the family Cossidae. As a wood-boring insect, it represents a significant challenge for silviculture and urban forestry, as its larvae inhabit the interior of tree trunks, making them difficult to detect until substantial damage has occurred.

This pest primarily attacks various species of the genus Populus, including poplars and aspens, and is also known to infest willow trees. The species is widely distributed across temperate regions, often favoring stands that are already under physiological stress, although it can successfully colonize healthy, mature trees.

The life cycle of Acossus populi typically spans several years. Adult females deposit eggs into bark crevices or existing wounds. Upon hatching, the larvae bore into the tree, constructing intricate galleries within the xylem and phloem. This feeding phase lasts for an extended period, allowing the larvae to grow significantly before they eventually pupate inside the trunk.

The impact of this pest is characterized by systemic damage to the host tree. Extensive tunneling disrupts nutrient and water transport, leading to canopy thinning, branch dieback, and structural instability. Diagnostic indicators include the presence of wood shavings (frass) at the tree base and dark, sap-stained patches on the bark, indicating active larval galleries.

Management strategies focus on integrated pest management (IPM) practices. Key efforts include the systematic removal and destruction of heavily infested trees during the dormant season to break the pest cycle. In urban and high-value settings, preventative bark treatments and the use of pheromone monitoring can help time the application of insecticides to control adult activity effectively.