Delaware (elm cultivar)
From Wikipedia, the free encyclopedia
The American Elm (U. americana) cultivar Delaware was originally selected (as tree number 218) from 35,000 seedlings inoculated with the Dutch elm disease fungus in USDA trials at Morristown, New Jersey. Further trials were conducted by both the USDA and the U. S. National Arboretum, which confirmed the clone had a fair level of resistance to the disease. Although propagated for further trials, the tree was never commercially released, as it is known to have a relatively low stature and undesirable branching habit. Like all other American Elm cultivars, Delaware is susceptible to elm yellows but resistant to elm leaf beetle. The original tree, which had been moved to the USDA National Arboretum, Washington, D. C. in 1948, died from unknown causes (probably elm yellows, by some accounts) in 1980, but a clone survives at the Denver Botanic Gardens, as 'Delaware II'.
Contents |
[edit] Arboreta etc. accessions
[edit] North America
- Denver Botanic Gardens, no details available.
- Dominion Arboretum, Canada, [1] No details available.
[edit] Europe
None known.
[edit] Nurseries
[edit] North America
[edit] Europe
None known.
[edit] Synonymy
- Delaware II.
[edit] References
- Santamour, F. S., & Bentz, S. E. Updated checklist of elm (Ulmus) cultivars for use in North America. Journal of Arboriculture, 21(3): May, 1995.
- 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.
