The American ElmcultivarUlmus americana 'Washington', of unknown derivation, was sourced from Princeton Nurseries, Princeton, New Jersey, from 1985, and planted on the National Mall, Washington D.C. It was then selected by H. V. Wester of the U. S. National Park Service and introduced for trials as NPS 3-178.[1] Santamour pointed out that as the historic Washington Elm had been propagated as 'Washington', NPS 3-178, if ever registered as a cultivar, would need a different cultivar name.
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 diseasesedit
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,[2] and highly preferred for feeding by the Japanese Beetle Popillia japonica[3][4] in the United States. U. americana is the most susceptible of all the elms to verticillium wilt.[5]
Cultivationedit
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.
^Santamour, Frank S.; Bentz, Susan E. (May 1995). "Updated Checklist of Elm (Ulmus) Cultivars for use in North America". Journal of Arboriculture. 21 (3): 122–131. Retrieved 20 June 2016.
^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. 94 (1). Oxford University Press (OUP): 162–166. doi:10.1603/0022-0493-94.1.162. ISSN 0022-0493. PMID 11233108. S2CID 42980569.
^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. 94 (2). Oxford University Press (OUP): 445–448. doi:10.1603/0022-0493-94.2.445. ISSN 0022-0493. PMID 11332837. S2CID 7520439.
^. Archived from the original on 2011-07-19. Retrieved 17 July 2017.
^Pegg, G. F. & Brady, B. L. (2002). Verticillium Wilts. CABI Publishing. ISBN0-85199-529-2
January 01, 1970
ulmus, americana, washington, american, cultivar, unknown, derivation, sourced, from, princeton, nurseries, princeton, jersey, from, 1985, planted, national, mall, washington, then, selected, wester, national, park, service, introduced, trials, santamour, poin. The American Elm cultivar Ulmus americana Washington of unknown derivation was sourced from Princeton Nurseries Princeton New Jersey from 1985 and planted on the National Mall Washington D C It was then selected by H V Wester of the U S National Park Service and introduced for trials as NPS 3 178 1 Santamour pointed out that as the historic Washington Elm had been propagated as Washington NPS 3 178 if ever registered as a cultivar would need a different cultivar name Ulmus americana Washington SpeciesUlmus americanaCultivar Washington OriginUS Contents 1 Description 2 Pests and diseases 3 Cultivation 4 Accessions 4 1 North America 5 External links 6 ReferencesDescription editThe 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 editThe 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 2 and highly preferred for feeding by the Japanese Beetle Popillia japonica 3 4 in the United States U americana is the most susceptible of all the elms to verticillium wilt 5 Cultivation editNeither 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 editNorth America edit Brooklyn Botanic Garden 1 Archived 2016 02 01 at the Wayback Machine New York US Acc no 850233 Smith College US Acc no 41703 External links edithttp fletcher ces state nc us programs nursery metria metria11 warren elm htm Return of the Elm the status of elms in the nursery industry in 2000 Warren K J Frank Schmidt and Co References edit Santamour Frank S Bentz Susan E May 1995 Updated Checklist of Elm Ulmus Cultivars for use in North America Journal of Arboriculture 21 3 122 131 Retrieved 20 June 2016 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 94 1 Oxford University Press OUP 162 166 doi 10 1603 0022 0493 94 1 162 ISSN 0022 0493 PMID 11233108 S2CID 42980569 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 94 2 Oxford University Press OUP 445 448 doi 10 1603 0022 0493 94 2 445 ISSN 0022 0493 PMID 11332837 S2CID 7520439 Elm Leaf Beetle Survey Archived from the original on 2011 07 19 Retrieved 17 July 2017 Pegg G F amp Brady B L 2002 Verticillium Wilts CABI Publishing ISBN 0 85199 529 2 Retrieved from https en wikipedia org w index php title Ulmus americana 27Washington 27 amp oldid 1197933844, wikipedia, wiki, book, books, library,
