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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.
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Description
'L'Assomption' is a very slow-growing tree.
Pests and diseases
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 [1], and highly preferred for feeding by the Japanese Beetle Popillia japonica [2] [3] in the United States. U. americana is also the most susceptible of all the elms to verticillium wilt.
Cultivation
The tree is not known to be in cultivation beyond Canada.
North America
References
Ulmus americana 'L'Assomption' Wikipedia(Text) CC BY-SA