Musk beetle

The musk beetle (Aromia moschata) is a longhorn beetle belonging to the family Cerambycidae. This insect is easily recognized by its metallic green or bronze-green color and long antennae. It derives its common name from the distinct musky scent secreted by its glands when the beetle feels threatened by potential predators.

The primary hosts for this pest include willow species, although it can also infest poplars, aspens, and alders. The musk beetle typically targets weakened, stressed, or old trees. While it prefers damaged specimens, high population levels can lead to the infestation of seemingly healthy trees, posing a risk to biodiversity and landscape health.

The lifecycle of the musk beetle is complex and typically spans three to four years. Females deposit eggs into crevices in the bark. After hatching, the larvae bore directly into the wood, where they spend most of their development time creating extensive galleries. Pupation occurs within the wood, and the adults emerge by chewing exit holes through the bark.

The damage caused by the musk beetle is primarily due to larval activity. By tunneling through the sapwood and heartwood, the larvae disrupt the tree's vascular system, leading to wilting, branch dieback, and eventually structural failure of the tree. The tunnels also create entry points for secondary fungal pathogens that accelerate wood decay.

• Monitor tree health regularly for exit holes or frass.
• Prune and destroy severely infested branches during the dormant season.
• Remove and dispose of dead or dying trees to prevent adult emergence.
• Apply systemic or contact insecticides to trunks during the flight period if necessary.
• Maintain tree vigor through proper watering and soil management.