Prionoxystus

Prionoxystus is a genus of moths in the family Cossidae, commonly known as carpenter moths. These moths are characterized by their robust bodies and relatively broad wingspans. The larvae of Prionoxystus species are wood-boring and are considered pests of various hardwood trees. They feed on the cambium and sapwood, creating galleries within the trunk and branches. The life cycle can be prolonged, often taking several years to complete due to the slow development of the larvae within the host tree.

The adult moths are generally crepuscular or nocturnal. Their coloration varies among species, but many exhibit cryptic patterns that help them blend with tree bark. Prionoxystus is found in North America and parts of Europe. Some species, like Prionoxystus robiniae, the black carpenter moth, are well-known for their significant damage to ornamental and forest trees, including oaks, maples, and ash. Control measures often focus on preventing infestation or managing established larval populations. Research into the biology and control of Prionoxystus moths continues due to their ecological and economic impact.