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  2. Dutch elm disease - Wikipedia

    en.wikipedia.org/wiki/Dutch_elm_disease

    However, 'Princeton' has not proven resistant in Europe, where the main vector of the disease—the larger elm bark beetle, Scolytus scolytus—is capable of introducing far more fungal spores into the tree; many of the 50 trees planted at Highgrove House in the south-west of England in 2006 had died from Dutch elm disease by 2011.

  3. Ulmus americana 'Jefferson' - Wikipedia

    en.wikipedia.org/wiki/Ulmus_americana_'Jefferson'

    The American Elm cultivar Ulmus americana 'Jefferson' was cloned from a tree growing near a path in front of the Freer Gallery of Art, close to the Smithsonian Institution Building ("The Castle") on the National Mall in Washington, D.C. [1] The United States National Park Service, which had planted the tree during the 1930s, cloned it in 1993 after screening tests showed that it possessed an ...

  4. Ulmus americana - Wikipedia

    en.wikipedia.org/wiki/Ulmus_americana

    Dutch elm disease (DED) is a fungal disease that has ravaged the American elm, causing catastrophic die-offs in cities across the range. It has been estimated that only approximately 1 in 100,000 American elm trees is DED-tolerant, most known survivors simply having escaped exposure to the disease. [19]

  5. Ulmus americana 'Valley Forge' - Wikipedia

    en.wikipedia.org/wiki/Ulmus_americana_'Valley_Forge'

    The American Elm cultivar Ulmus americana 'Valley Forge' was raised by the Agricultural Research Service in Maryland. The tree was released to wholesale nurseries without patent restrictions by the U. S. National Arboretum in 1995 after proving to have a high resistance to Dutch elm disease. 'Valley Forge' proved only moderately successful in ...

  6. Ulmus americana 'Princeton' - Wikipedia

    en.wikipedia.org/wiki/Ulmus_americana_'Princeton'

    The American Elm cultivar Ulmus americana 'Princeton' was originally selected in 1922 by New Jersey nurseryman William Flemer of Princeton Nurseries for its aesthetic merit. 'Princeton' was later found to have a moderate resistance to Dutch elm disease (DED). [1] [2] [3]

  7. Ulmus americana 'L'Assomption' - Wikipedia

    en.wikipedia.org/wiki/Ulmus_americana_'L'Assomption'

    The tree is highly resistant to Dutch elm disease. [1] No other specific information is available, but the species as a whole is highly susceptible to Elm Yellows; it is also moderately preferred for feeding and reproduction by the adult Elm Leaf Beetle Xanthogaleruca luteola, [3] and highly preferred for feeding by the Japanese Beetle Popillia japonica [4] [5] in the United States.

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