Ulmus americana 'L'Assomption'

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Ulmus americana
Cultivar 'L'Assomption'
Origin L'Assomption Experimental Station, Quebec, Canada

The American Elm cultivar Ulmus americana 'L'Assomption' was selected from seedlings grown from X-irradiated seed at the eponymous experimental station in Quebec before 1965.[1][2]


'L'Assomption' is a very slow-growing tree.

Pests and diseases[edit]

The tree is reputedly highly resistant to Dutch elm disease. No other specific information available, but the species is highly susceptible to Elm Yellows; it is also moderately preferred for feeding and reproduction by the adult Elm Leaf Beetle Xanthogaleruca luteola [3] [1], and highly preferred for feeding by the Japanese Beetle Popillia japonica [4] [2] [3] in the United States. U. americana is also the most susceptible of all the elms to verticillium wilt.[5]


The tree is not known to be in cultivation beyond Canada.


North America[edit]

  • Morden Arboretum, Morden, Canada. Two trees received 1970 from the Forest Research Laboratory in Sillary, Quebec. Acc. no. 65-0328


  1. ^ Ouellet, C-E., & Pomerleau, R., (1965). Canad. J. Bot. 43:85-96, 1965.
  2. ^ Santamour, Frank S.; Bentz, Susan E. (May 1995). "Updated Checklist of Elm (Ulmus) Cultivars for use in North America". Journal of Arboriculture. 21 (3): 122–131. Retrieved 20 June 2016. 
  3. ^ Miller, F. and Ware, G. (2001). Resistance of Temperate Chinese Elms (Ulmuss spp.) to Feeding of the Adult Elm Leaf Beetle (Coleoptera: Chrysomelidae). Journal of Economic Entomology 94 (1): 162-166. 2001. Entom. Soc.of America.
  4. ^ Miller, F., Ware, G. and Jackson, J. (2001). Preference of Temperate Chinese Elms (Ulmuss spp.) for the Feeding of the Japanese Beetle (Coleoptera: Scarabaeidae). Journal of Economic Entomology 94 (2). pp 445-448. 2001. Entom. Soc.of America.
  5. ^ Pegg, G. F. & Brady, B. L. (2002). Verticillium Wilts. CABI Publishing. ISBN 0-85199-529-2