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.Ouellet, C-E., & Pomerleau, R., (1965). ''Can. J. Bot.'' 1965; 43:85-96

Description

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

Pests and diseases

The tree is highly resistant to Dutch elm disease. No other specific information is available, but the species as a whole is highly susceptible to

Elm Yellows Elm yellows is a plant disease of elm trees that is spread by leafhoppers or by root grafts."Elm Yellows." Elmcare.Com. 19 Mar. 2008 . Elm yellows, also known as elm phloem necrosis, is very aggressive, with no known cure. Elm yellows occurs in the ...

; it is also moderately preferred for feeding and reproduction by the adult Elm Leaf Beetle '' Xanthogaleruca luteola'', and highly preferred for feeding by the Japanese Beetle ''

Popillia japonica The Japanese beetle (''Popillia japonica'') is a species of scarab beetle. The adult measures in length and in width, has iridescent copper-colored elytra and a green thorax and head. It is not very destructive in Japan (where it is control ...

'' in the United States. ''U. americana'' is also the most susceptible of all the elms to

verticillium wilt Verticillium wilt is a wilt disease affecting over 350 species of eudicot plants. It is caused by six species of ''Verticillium'' fungi: ''V. dahliae'', ''V. albo-atrum'', ''V. longisporum'', ''V. nubilum'', ''V. theobromae'' and ''V. tricorpu ...

.Pegg, G. F. & Brady, B. L. (2002). ''Verticillium Wilts''. CABI Publishing.

Cultivation

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

Accessions

North America

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

References

American elm cultivar Ulmus articles missing images Ulmus {{Ulmaceae-stub