Crimson longhorn beetle

The Crimson longhorn beetle (Pyrrhidium sanguineum) is a member of the Cerambycidae family within the order Coleoptera. This species is widely distributed across Europe and the Caucasus, primarily inhabiting broad-leaved forests, parks, and orchards where it targets weakened or recently felled timber.

The beetle primarily infests various broad-leaved trees, with a strong preference for oak, beech, hornbeam, and occasionally fruit trees such as apple or plum. It targets the bark-covered trunks and branches of trees that are already suffering from physiological stress, drought, or mechanical damage.

The biological development of this species typically spans one year. Adults are active during the spring months, from April to June. Females deposit their eggs into the crevices of the bark. Upon hatching, the larvae move under the bark, excavating broad, meandering galleries within the cambium layer, which they fill with frass.

The damage caused by the Crimson longhorn beetle manifests as bark loosening and the disruption of the tree's nutrient transport system. This activity significantly weakens the host tree, making it susceptible to secondary pests and fungal infections, which can eventually lead to the dieback of branches or the total death of the tree.

Effective management strategies focus on integrated pest management practices. The most crucial measure is the timely removal and disposal of infested or dying trees to prevent population outbreaks. Maintaining tree health through proper silviculture and garden care minimizes the risk of infestation. Chemical control, involving insecticide application on trunks, is rarely required but can be considered during peak adult activity.