Valley Forge (elm cultivar)

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The American Elm U. americana cultivar Valley Forge is the most Dutch elm disease resistant of the American Elms. Raised by the Maryland Agricultural Research Service, it was released to wholesale nurseries by the U. S. National Arboretum in 1995. However, although also resistant to elm leaf beetle, like all other American Elm cultivars Valley Forge is susceptible to elm yellows. All examples included in 10-year trials at Atherton, California, to evaluate replacements for Californian elms lost to disease, were withdrawn after a combination of rapid growth and poor structure condemned the trees as likely to require more maintenance than most municipalities would find acceptable (Costello, 2004).

Valley Forge was named for the site where American soldiers survived the winter during the War of Independence. The tree is not known to be in cultivation in Europe or Australasia.

[edit] References

Costello, L. R. (2004). A 10 -year evaluation of the performance of four elm cultivars in California, U. S. Journal of Arboriculture, March 2004. [1]
Townsend, A. M., Bentz, S. E., and Douglass L. W. (2005). Evaluation of 19 American Elm Clones for Tolerance to Dutch Elm Disease. Journal of Environmental Horticulture, March 2005, Horticultural Research Institute, Washington, D.C.