Ulmus americana 'Columnaris'

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Ulmus americana
Ulmus americana columnaris.jpg
'Columnaris' 60 ft (18 m) tall and a spread of 18 ft (5.5 m) (circa 1951).
Cultivar 'Columnaris'
Origin Conesus Lake, New York, USA

The American Elm cultivar Ulmus americana 'Columnaris' was propagated from a tree found by Mr John Dunbar at Conesus Lake, New York, before 1920.[1] The tree should not be confused with U. americana var. columnaris Rehder, J. Arnold Arbor. 3: 42, 1922.

Description[edit]

As implied by its name, the tree has a fastigiate, columnar form [1].

Pests and diseases[edit]

No specific information available, but the species is highly susceptible to Dutch Elm Disease and Elm Yellows; it is also moderately preferred for feeding and reproduction by the adult Elm Leaf Beetle Xanthogaleruca luteola [2] [2], and highly preferred for feeding by the Japanese Beetle Popillia japonica [3] [3] [4] in the United States. U. americana is also the most susceptible of all the elms to verticillium wilt.[4]

Cultivation[edit]

'Columnaris' is not known to have been cultivated beyond the United States, and is no longer in commerce.

Accessions[edit]

North America
  • Morton Arboretum. Specimen in the Columnar Tree Section reputed to be "in good health" in the autumn of 2006. Acc. no. 1041-41, (graft).

References[edit]

  1. ^ Green, Peter Shaw (1964). "Registration of cultivar names in Ulmus". Arnoldia. Arnold Arboretum, Harvard University. 24 (6–8): 41–80. Retrieved 16 February 2017. 
  2. ^ Miller, F. and Ware, G. (2001). Resistance of Temperate Chinese Elms (Ulmuss spp.) to Feeding of the Adult Elm Leaf Beetle (Coleoptera: Chrysomelidae). Journal of Economic Entomology 94 (1): 162-166. 2001. Entom. Soc.of America.
  3. ^ Miller, F., Ware, G. and Jackson, J. (2001). Preference of Temperate Chinese Elms (Ulmuss spp.) for the Feeding of the Japanese Beetle (Coleoptera: Scarabaeidae). Journal of Economic Entomology 94 (2). pp 445-448. 2001. Entom. Soc.of America.
  4. ^ Pegg, G. F. & Brady, B. L. (2002). Verticillium Wilts. CABI Publishing. ISBN 0-85199-529-2

External links[edit]