在欧洲,关于榆树枯萎病的早期历史已成为人们长期以来推测的问题。上个世纪就曾有人见到过染有好像是由榆枯萎菌 Cerat-ocystis ulmi(Buis.)Moreau 引起的病害症状,但这种证据是不确实的,因为其它病菌也可以引起这样的症状。在北美有一种含糊的概念,认为 C.ulmi 可能是在第一次世界大战中来挖战壕的中国劳工带到欧洲的。 In Europe, the early history of the blight of Elm has long been a matter of speculation. It has been seen in the last century that there are symptoms of the disease that appear to have been caused by Cerat-ocystis ulmi (Buis.) Moreau, but this evidence is implausible because other germs can cause such symptoms. There is a vague notion in North America that C.ulmi may have brought Chinese workers who dug trenches during World War I to Europe.