PMC

A Platypus koryoensis-infested Mongolian oak tree (Quercus mongolica Fisch, ex Ledeb) and the beetle-damaged wood disc. A, An oak tree infested by the beetle; B, An oak stem damaged by mass attack of P. koryoensis. Arrows indicate infected holes on the surface of bark; C, Part of the cut surface feature of an oak disc. Arrows indicate insect gallery of the beetle; D, An adult beetle and a hole where the beetle emerged.