Dutch elm disease (
DED) is caused by a member of the
sac fungi (Ascomycota) affecting
elm trees, and is spread by the
elm bark beetle. Although believed to be originally native to Asia, the disease has been accidentally introduced into America and Europe,
where it has devastated native populations of elms which had not had
the opportunity to evolve resistance to the disease. The name "Dutch elm
disease" refers to its identification in 1921 and later in the Netherlands by Dutch phytopathologists
Bea Schwarz and
Christine Buisman who both worked with Professor
Westerdijk
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