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Pest Risk Analysis for Neoclytus acuminatus


Neoclytus acuminatus is highly polyphagous and invasive North American cerambycid (longhorn beetle) species. It has become well established as an invasive non-native species in continental Europe, where it continues to spread and expand its range. However, it has not to date become established in north western Europe despite occasional introductions including in Ireland. 

The species is regarded as a secondary pest since attacks on healthy trees has not been widely reported. Current evidence suggests pest attacks are in association with cut timber/logs or with trees in decline. 

Overall impacts for Ireland are rated as low. While the highly polyphagous N. acuminatus could be associated with a number of commodities for entry into Ireland, uncertainty surrounds how suitable the Irish climate is for establishment. It is likely the Irish climate is not highly favourable for the development of several generations of this species or the build up of population densities as seen in other warmer climates.

Irish ash affected by ash dieback may aid establishment and may make trees in Ireland more vulnerable and suitable for attack. 

With no evidence of significant economic, environmental or social impacts found for N. acuminatus in its current distribution (native and invaded), the overall impact rating is low for Ireland.


  • Neoclytus acuminatus


  • Carya
  • Celtis
  • Diospyros
  • Fraxinus
  • Juglans
  • Quercus
  • Ulmus


Type File Size
Pest Risk Analysis Download 1,05MB

PRA Area

  • Ireland