Description

Pine wilt disease (PWD) is a lethal wilting disease recognised as one of the most serious threats to conifer forestry worldwide. The disease is caused by the pinewood nematode (PWN) (Bursaphelenchus xylophilus), which travels between trees on the bodies of cerambycidae Monochamus beetles. PWN enter trees through beetle feeding wounds and egg notches, grow inside the trees and gather on developing beetles inside the wood, before the beetle emerges and travels to feed and mate, spreading the nematode further.

PWN has been intercepted on infested packaging material coming through UK ports and processors and could arrive in the UK. The UK has no indigenous Monochamus species, however, PWN is known to have formed new associations with native Monochamus beetles in countries outside of its native North American range. Other beetles in the UK display similar life history behaviours to Monochamus beetles and there is concern that they could act as alternative vectors for PWN. This is a horizon scanning PhD project that seeks to inform future forestry about the risks posed if PWN arrives in the UK.

The project examines the relationship between Monochamus and PWN and assess the risk of UK longhorn and bark beetles as potential vectors of PWN and will:

• Survey UK pinewood samples and associated beetles to assess the native nematode species present in the environment currently.
• Characterise and compare the volatile organic cuticular compounds (VOCCs), chemical cues given off by the UK beetle species (potential carriers/vectors) to those found in Monochamus.
• Perform experiments exposing PWN to a range of UK beetle cuticular extractions, both with and without the co-presence of Monochamus extractions to assess nematode responses to chemical cues.
• Draw up actionable recommendations for PWN.

Outputs

This project will deliver:

• Peer reviewed journal articles.
• Recommendations for policies regarding PWN in the UK.