Ulmus americana 'L'Assomption'
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. 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; 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" in the United States. "U. americana