Pityokteines

Under bark of coniferous trees, primarily fir (Abies spp.). Found in forest ecosystems and arboreta where host conifers occur.

Europe (widespread); recorded in Croatia, Czech Republic, Sweden, Norway, Vermont (USA), and Türkiye.

Phloem-feeding on conifers; specifically documented on Abies species and Tsuga canadensis.

• Abies alba - primary hostsilver fir
• Abies bornmulleriana - hostNordmann fir
• Abies spp. - primary hostfir species generally
• Tsuga canadensis - hostEastern hemlock; newly recorded host
• Picea pungens - hostblue spruce
• conifers in Abietoideae - potential hostinferred host range expansion

Males bore into bark first and release aggregation pheromones that, combined with host volatiles, regulate mass colonization of trees. Species exhibit distinct pheromone communication: P. curvidens produces ipsenol only; P. spinidens and P. vorontzovi produce both ipsenol and ipsdienol. Pheromone biosynthesis is triggered by feeding and regulated by juvenile hormone.

Major forest pest causing significant tree mortality. Natural populations are subject to suppression by entomopathogenic microsporidia (Chytridiopsis cf. typographi). Serves as transport host for phoretic mites (at least 16 mite species documented on P. curvidens alone).

Significant economic pest of fir and other conifers in forestry and urban arboreta. Pheromone-based monitoring systems (e.g., Curviwit) are used for detection and potential control.

• Cryphalus piceaeFrequently co-occurs with P. curvidens on the same trees; both are bark beetles associated with fir
• IpsRelated bark beetle genus also producing ipsenol and ipsdienol pheromones; differs in gallery patterns and host range

• bark beetle
• forest pest
• pheromone
• fir
• Abies
• Scolytinae
• aggregation pheromone
• ipsenol
• ipsdienol
• phoretic mites
• entomopathogen
• juvenile hormone

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• New associations of phoretic mites on Pityokteines curvidens (Coleoptera, Curculionidae, Scolytinae)
• The first record and occurrence of microsporidian pathogen, Chytridiopsis cf. typographi (Microspora) in Pityokteines curvidens (Coleoptera, Curculionidae) populations in Türkiye
• Eastern Hemlock (Tsuga canadensis) as a new host of Pityokteines spinidens in the arboretum in Europe
• Aggregation pheromones of the European fir engraver beetles Pityokteines curvidens, P. spinidens and P. vorontzovi and the role of juvenile hormone in pheromone biosynthesis1