Officials are planning future beetle surveys and will try to limit the infestation with "girdling, " in which thick strips of bark are removed from around infested ash trees.

WSJ: Mass. creates quarantine zone to contain insect

Strange claw marks an inch thick have also been found on the bark of a shrub at Trewithen Gardens near Truro.

BBC: 'Beast of Bodmin' sighted at Trewithen Gardens