Crossotarsus simplex

Crossotarsus simplex is a species of bark and ambrosia beetle belonging to the family Curculionidae, subfamily Scolytinae. These insects are classified as wood-boring pests that primarily attack compromised or stressed trees, often remaining undetected due to their deep penetration into the heartwood.

The host range of this pest typically includes a variety of deciduous and coniferous tree species. Infestations are most prevalent in timber yards or forest areas where trees have been weakened by environmental factors, previous diseases, or poor forest management practices, making them susceptible to colonization.

The biology of this species is characterized by a symbiotic relationship with ambrosia fungi. Upon entering the wood, the beetles cultivate these fungi within their galleries. The developing larvae feed primarily on the fungus rather than the wood itself, which allows the beetles to inhabit wood that would otherwise be nutritionally inadequate.

Damage caused by this pest includes systemic degradation of timber quality. The galleries created by the beetles disrupt the internal structure of the tree, allowing for further infection by rot-causing pathogens. The presence of these beetles is often indicated by fine wood dust (frass) ejecting from small entry holes on the bark.

Control strategies prioritize preventive forest management and phytosanitary measures.

• Rapid removal and processing of infested timber to break the life cycle;
• Implementation of monitoring programs using pheromone-baited traps;
• Maintenance of forest hygiene by removing fallen or damaged logs;
• Chemical treatments for high-value timber stocks during peak beetle flight seasons.