Phloeosinus thujae

This species is smaller than the Phloeosinus aubei and measures only 1.5 to 2 mm in size. It has a dark brown or black body, and males have relatively prominent serrated teeth on their elytra. Mating occurs from May to June. After mating, females usually create a uniramous gallery where they lay eggs on the sides. The larvae then hatch and create tunnels filled with sawdust. The emergence hole is circular with a diameter of approximately slightly over 1mm. Subsequently, the imagoes undergo a maturation feeding, which is also dangerous. A characteristic of the maturation feeding and gallery formation is the presence of fine sawdust found at the site of the gall. Around entrance holes, the tree may also exude resin. It has one generation per year