It is a fungus which attacks elm trees. Although scientists are still unsure about the origins of Ophiostoma ulmi, Japan is becoming the favourite country … | https://www.google.com/url?rct=j&sa=t&url=http://www.falkirkherald.co.uk/lifestyle/outdoors/sandy-s-garden-the-great-elm-tree-mystery-1-4273349&ct=ga&cd=CAIyHDJjOTFlNWQ3OTM0ZWVkOTg6Y28udWs6ZW46R0I&usg=AFQjCNFSSALd3ksILkc8LMqeikHb7WBUbQ