Adults are ~4 mm, dark brown. Attacks stressed pines. Two to four generations/year. Males produce aggregation pheromones. Overwinters as adults .

Attacks ponderosa, lodgepole, and sugar pines. Creates galleries under bark, girdling trees. Transmits fungi .

Western North America (US, Canada) .

Visual inspection of pitch tubes and boring dust. Pheromone traps .

Pheromone traps (e.g., multi-funnel traps) .