Zigzag elm sawfly attacking trees in UK, warn experts

Elm leaf-eating pest has gradually travelled across Europe from Japan, leaving mark reminiscent of that by Zorro's sword

A pest which leaves a signature trail of destruction on elm leaves reminiscent of the mark of the fictional sword-wielding hero Zorro appears to have arrived in the UK, experts have warned.

The zigzag elm sawfly, originally found in Japan, feeds only on elm leaves and has been progressing steadily through Europe.