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. …The discovery has raised concerns it could pose another blow to the UK’s elms, which have already been devastated by Dutch elm disease, and threaten wildlife that rely on the trees. …“Action is needed now. Government, with buy-in from the forestry and horticulture sectors, and even supermarkets that sell plants, need to help minimise further risks to our native trees and woodlands.”