Ulmus americana 'Washington'

The American Elm cultivar Ulmus americana 'Washington' is a tree of unknown derivation introduced by the U. S. National Park Service.

Ulmus americana 'Washington'
SpeciesUlmus americana
Cultivar'Washington'
OriginUS

Description

The tree has been described as possibly having triploid chromosome levels (unusual for an American Elm), suggesting it may be a hybrid between the tetraploid and rarer diploid forms of American Elm, like the cultivar 'Jefferson'.

Pests and diseases

The tree is resistant to Dutch elm disease, but less so than other contemporaneous American Elm cultivars such as 'Valley Forge'. Like all other American Elm cultivars, it is also susceptible to Elm Yellows. No other specific information available, but the species generally is also moderately preferred for feeding and reproduction by the adult Elm Leaf Beetle Xanthogaleruca luteola [1], and highly preferred for feeding by the Japanese Beetle Popillia japonica [2] [3] in the United States. U. americana is the most susceptible of all the elms to verticillium wilt.[4]

Cultivation

Neither 'Washington' nor 'Jefferson' has been widely tested beyond Washington D.C.. The tree is not known to be in commerce, nor known to be in cultivation beyond the United States.

Accessions

North America
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References
  1. Miller, Fredric; Ware, George (2001-02-01). "Resistance of Temperate Chinese Elms (Ulmus spp.) to Feeding by the Adult Elm Leaf Beetle (Coleoptera: Chrysomelidae)". Journal of Economic Entomology. Oxford University Press (OUP). 94 (1): 162–166. doi:10.1603/0022-0493-94.1.162. ISSN 0022-0493. PMID 11233108.CS1 maint: ref=harv (link)
  2. Miller, Fredric; Ware, George; Jackson, Jennifer (2001-04-01). "Preference of Temperate Chinese Elms ( Ulmus spp.) for the Adult Japanese Beetle (Coleoptera: Scarabaeidae)". Journal of Economic Entomology. Oxford University Press (OUP). 94 (2): 445–448. doi:10.1603/0022-0493-94.2.445. ISSN 0022-0493. PMID 11332837.
  3. "Elm Leaf Beetle Survey". Archived from the original on 2011-07-19. Retrieved 17 July 2017.
  4. Pegg, G. F. & Brady, B. L. (2002). Verticillium Wilts. CABI Publishing. ISBN 0-85199-529-2
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