Most Unwanted: Asian Longhorn Beetle

How to spot the Asian Longhorn Beetle (Anoplophora glabripennis).


  • Adult beetles are black, shiny, 20-35 mm long and 7-12 mm wide
  • Each wing-case has about 20 distinctive, irregular, white spots
  • Antennae are very long. They are black but each segment has a distinctive blue-grey or a creamy-white base
  • Larvae cause the most damage as they tunnel internally through trunks and branches. Adults exit through circular holes on the trunk, around 10 mm in diameter
  • If the holes are near the roots, it is more likely to be the Citrus Longhorn Beetle instead.

Plants affected:

  • They infest a wide variety of tree species, especially Poplar, Sycamore and Willow.

UK status and other information:

  • Not yet present in the UK
  • A major outbreak occurred in Kent in 2012, with 2,000 trees felled to eradicate the beetle. This outbreak was traced to wood packing imported from the Far East
  • This beetle is a native of China and has caused extensive damage to trees in the USA and Italy since being accidentally introduced there in recent years.

Why will any findings be important?

  • If they became established, these beetles would be a major threat because they can infest a wide range of broadleaved trees
  • Tunnelling by larvae leaves the tree more susceptible to diseases and wind damage
  • If possible, the beetle should be caught and placed in a secure container such as a sealed glass jar so that an inspector can collect it. The beetles are not harmful to humans.

Could be confused with:

Useful links: