 It derives its name 'Dutch' from the first description of the disease and its cause in the 1920s by the Dutch botanists Bea Schwarz and Christina Johanna Buisman.Owing to its geographical isolation and effective quarantine enforcement, Australia, has so far remained unaffected by Dutch Elm Disease, as have the provinces of Alberta and British Columbia in western Canada.DED is caused by a micro-fungus transmitted by two species of "Scolytus" elm-bark beetle which act as vectors.