The beetles were brought to America in 1909 in shipments of European elm
logs imported to make veneer.
And, so many dead or dying elms mean new breeding sites for the Lesser European elm
Though many researchers have created Dutch elm disease--tolerant hybrid elm varieties from Asiatic and European elms
, Spalthoff says, "Hybrid trees differ in appearance from the classic American elm that people remember.
Europe is now thoroughly colonized by aggressive forms, and the prognosis for European elms
is very bad.