Above: An elm-lined street in St. Paul, MN, before most of the trees were killed by Dutch Elm Disease. Although the American elm persists in forests and pockets of cities and towns, Dutch Elm Disease ...
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American elm (Ulmus americana) and slippery elm (U. rubra), two of six species of elms found in North America, are known together as soft elms. Rock, winged, cedar and September elm are known as hard ...
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