- Ulmus americana 'Columnaris'
Ulmus americana Details Cultivar 'Columnaris' Origin Conesus Lake, New York, USA
The American Elm Ulmus americana 'Columnaris' has a columnar form , and was propagated from a tree found by Mr John Dunbar at Conesus Lake, New York, before 1920 . The tree should not be confused with U. americana var. columnaris Rehder, J. Arnold Arbor. 3: 42, 1922.
Pests and diseases
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  , and highly preferred for feeding by the Japanese Beetle Popillia japonica    in the USA. U. americana is also the most susceptible of all the elms to verticillium wilt .
'Columnaris' is not known to have been cultivated beyond the USA, and is no longer in commerce.
- 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).
- ^ Green, P. S. (1964). Registration of cultivar names in Ulmus. Arnoldia, Vol. 24. Arnold Arboretum, Harvard University. 
- ^ 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.
- ^ 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.
- ^ Pegg, G. F. & Brady, B. L. (2002). Verticillium Wilts. CABI Publishing. ISBN 0851995292
- http://www.bgci.org/plant_search.php?action=Find&ftrGenus=Ulmus&ftrRedList=&ftrSpecies=&ftrRedList1997=&ftrEpithet=&ftrCWR=&x=41&y=19NB. Botanic Gardens Conservation International register
- http://redwood.mortonarb.org/PageBuilder?cid=2&qid=13 Morton Arboretum catalogue
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