The Asian longhorn beetle (Anoplophora glabripennis) is native to Southeast Asia where it is a serious pest of broadleaved trees. It was introduced into the USA and Canada in the 1990s and since 2000 there have been a number of outbreaks in Europe. In 2012, an outbreak was discovered in Kent, in the UK.
Forest Research collected detailed information about the outbreak in Kent and the tree species that were affected.
This page will help you to identify and report sightings of Asian longhorn beetles.
- Kills many species of broadleaved trees
- Broken and dead branches
- Flattened or oval ‘grub holes’ in the wood
- Round exit holes with a diameter of 10 mm
- Damages small and large trees, in rural and urban areas
- Only viable management option is felling, sanitation and quarantine
The beetle develops through its full life cycle in either one, two or three years, depending upon its geographic location.
- Adults are active from May to October
- Adults feed and mate in tree crowns
- Females lay eggs within pits that they chew in the bark
- Eggs laid in the summer hatch after 2-3 weeks
- Larvae pass through seven to eight growth stages (instars)
- Pupation occurs in the spring
Report insect sightings
If you suspect that a tree or imported wood is infested with Asian longhorn beetle, you should report it immediately to:
Forest Research, Entomology Branch
Tel: 0300 067 5600
Forest Research has recently summarised the tree species that were attacked by Asian longhorn beetle in Kent. The most important host was sycamore (Acer pseudoplatanus), but field maple, box elder, sallow, willow, horse-chestnut and poplar were also attacked. The beetle’s larvae and pupae were found most frequently in stems and branches that were 4-10cm in diameter.