The
American Elm cultivar ''Ulmus americana'' 'Exhibition' is a selection made by the Patmore Nurseries from seeds of a tree at
Brandon,
Manitoba. Released in 1952, 'Exhibition' was propagated by grafting.
Description
The tree has an upright habit, with a dense, vase-shaped canopy formed from branches bearing numerous small twigs.
Pests and diseases
No specific information available, but the species as a whole is highly susceptible to
Dutch Elm Disease and
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's status in
North America
North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Car ...
is not known. 'Exhibition' is no longer in commerce.
Synonymy
*'Exhibition Boulevard': Anon.
References
{{Elm species, varieties, hybrids, hybrid cultivars and species cultivars , state=collapsed
American elm cultivar
Ulmus articles missing images
Ulmus#