The
Chinese Elm cultivar
A cultivar is a type of cultivated plant that people have selected for desired traits and when propagated retain those traits. Methods used to propagate cultivars include: division, root and stem cuttings, offsets, grafting, tissue culture, ...
''Ulmus parvifolia'' 'Pathfinder' is another development by A. M. Townsend of the
USDA
The United States Department of Agriculture (USDA) is the federal executive department responsible for developing and executing federal laws related to farming, forestry, rural economic development, and food. It aims to meet the needs of com ...
National Arboretum registered in 1990.
Description
The tree is of modest proportions, rarely reaching > 11 m in height, with a crown slightly less in diameter. The leaves are a glossy yellow-green, and variously described as turning 'grayish red' or 'brilliant red' in autumn. The trunk sports the typical mottled bark.
[''Amer. Nurseryman'', 175(4): 42, 1992.][Spongberg, S. A. (1991), ''HortScience'' 26: 476, 1991.
]
Pests and diseases
The species and its cultivars are highly resistant, but not immune, to
Dutch elm disease
Dutch elm disease (DED) is caused by a member of the sac fungi (Ascomycota) affecting elm trees, and is spread by elm bark beetles. Although believed to be originally native to Asia, the disease was accidentally introduced into Americas, America ...
, and unaffected by the Elm Leaf Beetle ''
Xanthogaleruca luteola''.
However, tolerance of
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 ...
in the USA was found to be poor.
[Sinclair, W. A., Townsend, A. M., Griffiths, H. M., & Whitlow, T. H. (2000). Responses of six Eurasian Ulmus cultivars to a North American elm yellows phytoplasma. ''Plant disease'', Vol. 84, No.12, 1266-1270. American Phytopathological Society, St. Paul, MN]
Cultivation
'Pathfinder' is not known to be in cultivation beyond North America.
Accessions
North America
*
Arnold Arboretum
The Arnold Arboretum of Harvard University is a botanical research institution and free public park, located in the Jamaica Plain and Roslindale neighborhoods of Boston, Massachusetts. Established in 1872, it is the oldest public arboretum in N ...
, US. Acc. no. 135-98
References
External links
*http://www.ces.ncsu.edu/depts/hort/consumer/factsheets/trees-new/cultivars/ulmus_parvifolia.htm ''Ulmus parvifolia'' cultivar list.
Chinese elm cultivar
Ulmus articles missing images
Ulmus
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