The American Elm

American Elm

Ulmus americana, generally known as the American Elm or, less commonly, as the White Elm or Water Elm, is a species native to eastern North America, occurring from Nova Scotia west to Alberta and Montana, and south to Florida and central Texas. The American elm is an extremely hardy tree that can...

 Ulmus americana cultivar 'Morden' http://www.horticopia.com/hortpix/html/pb12764.htm was selected by the Dominion Experimental Farm, Morden

Morden, Manitoba

Morden is a small town with a population of 6571 located in the Pembina Valley region of southern Manitoba, Canada. Morden is less than ten minutes west of neighbouring Winkler, and a relatively short distance to Pembina Valley Provincial Park...

, Manitoba

Manitoba

Manitoba is a Canadian prairie province with an area of . The province has over 110,000 lakes and has a largely continental climate because of its flat topography. Agriculture, mostly concentrated in the fertile southern and western parts of the province, is vital to the province's economy; other...

, in 1939 on account of its ability to withstand severe ice storms without breakage.

Pests and diseases

The tree is not known to have a resistance to Dutch elm disease

Dutch elm disease

Dutch elm disease is a disease caused by a member of the sac fungi category, affecting elm trees which is spread by the elm bark beetle. Although believed to be originally native to Asia, the disease has been accidentally introduced into America and Europe, where it has devastated native...

 (see Cultivation). Its tolerance of Elm Leaf Beetle Xanthogaleruca luteola

Xanthogaleruca luteola

Xanthogaleruca luteola, commonly known as the Elm Leaf Beetle, is a serious pest of the elm. Indigenous to Europe, it was accidentally introduced to North America. Both the imagines and larvae feed on the emergent leaves of the elm...

, and Elm Yellows

Elm Yellows

Elm Yellows is a plant disease of elm trees that is spread by leafhoppers or by root grafts. Elm Yellows, also known as Elm Phloem Necrosis, is very aggressive, with no known cure. Elm Yellows occurs in the Eastern United States and southern Ontario in Canada. It is caused by phytoplasmas which...

 is unknown.

Cultivation

The tree was first marketed by the Patmore Nurseries, Brandon

Brandon, Manitoba

Brandon is the second largest city in Manitoba, Canada, and is located in the southwestern area of the province. Brandon is the largest city in the Westman region of Manitoba. The city is located along the Assiniboine River. Spruce Woods Provincial Park and CFB Shilo are a relatively short distance...

, Manitoba, circa 1948 .
A specimen planted in the Longenecker Gardens at the University of Wisconsin–Madison Arboretum Arboretum News, Vol. 9, No. 1, January 1960. University of Wisconsin in 1956 had died by 1974 "probably from Dutch elm disease

Dutch elm disease

Dutch elm disease is a disease caused by a member of the sac fungi category, affecting elm trees which is spread by the elm bark beetle. Although believed to be originally native to Asia, the disease has been accidentally introduced into America and Europe, where it has devastated native...

"; no others are known to remain in cultivation.