Ulmus 'Morton Plainsman'
| Ulmus 'Morton Plainsman' | |
|---|---|
| Genus | Ulmus |
| Hybrid parentage | U. pumila × U. davidiana var. japonica |
| Cultivar | 'Morton Plainsman' = Vanguard |
| Origin | US |
Ulmus 'Morton Plainsman' (selling name Vanguard) is a
Agriculture Canada Research Station at Morden, Manitoba. Tested in the US National Elm Trial coordinated by Colorado State University, [1]Vanguard averaged a survival rate of 78% after 10 years.[1]
Description
Vanguard has modest upright growth, increasing in height by an average of 0.8 m in an assessment at
American Elm. [2] However, its performance in the southern United States has not impressed, and it was dismissed, along with its Morton stablemates Commendation and Triumph, as "ugly" by Michael Dirr, Professor of Horticulture at the University of Georgia [3]
, on account of its "wild" growth and splaying branches.
Pests and diseases
Although resistant to
Xanthogaleruca luteola[2]
,[3] Japanese beetle,[4] and cankerworms.
Cultivation
In trials at the
Danada Charm) incidence of branch breakage occasioned by bark inclusions.[5] However, the tree has a high degree of drought and cold tolerance making it particularly suitable for afforestation in the Great Plains.[6][7] In artificial freezing tests at the Morton Arboretum[8] the LT50 (temp. at which 50% of tissues die) was found to be −40°C.
The tree is currently being evaluated in the National Elm Trial [4] coordinated by Colorado State University. It is not known to have been introduced to Australasia.
Hybrid cultivars
Vanguard was crossed with the hybrid cultivar
'Morton Glossy' = Triumph
.
Accessions
- North America
- Bartlett Tree Experts, US. Acc. nos. 2001–106, 2001-108
- Brenton Arboretum, US. 5 trees, acquired 2009. Acc. no. not known.
- Chicago Botanic Garden, US. 2 trees, no other details available.
- Dawes Arboretum [5], US. 3 trees, no acc. details available.
- Holden Arboretum, US. Acc. no. 00–127
- Morton Arboretum, US. Acc. nos. 273–97, 4–2004, 156–2005.[9]
- Smith College, US. Acc. no. 36505
- University of Idaho Arboretum, US. Two trees. Acc. no. 2000093
- Europe
- Grange Farm Arboretum, Lincolnshire, UK. Acc. no. 1139.
Nurseries
- North America
- Acorn Farms [6], Galena, Ohio, US.
- Bailey Nurseries [7], St. Paul, Minnesota, US.
- J. Frank Schmidt & Son [8], Boring, Oregon, US.
- Johnson's Nursery [9], Menomonee Falls, Wisconsin, US.
- Sun Valley Garden Centre [10], Eden Prairie, Minnesota, US.
References
- ^ Griffin, J.; et al. (2017). "Ten-Year Performance of the United States National Elm Trial" (PDF). Arboriculture & Urban Forestry. 43(3):107–120. International Society of Arboriculture, Atlanta, US.
- ^ a b McPherson, G. et al. (2008). National elm trial: Initial report from Northern California. Western Arborist, Fall 2009, 32–36.
- ^ "Elm Leaf Beetle Survey". Archived from the original on 2011-07-19. Retrieved 17 July 2017.
- ^ Brady, C., Condra, J., & Potter, D. (2008) Resistance of Landscape-suitable Elm (Ulmus spp.) Cultivars to Japanese Beetle, Leaf Miners, and Gall Makers. 2008 Research Report, Nursery & Landscape Program, 15–16. University of Kentucky.
- ^ Giblin, C. P. & Gillman, J. H. (2006). Elms for the Twin Cities: A Guide for Selection and Maintenance. University of Minnesota.
- ^ 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.
- ^ Ware, G. (1992). Morton. Arb. Quarterly 28(1): 1–5, 1992.
- Sakura, Japan.
- ^ Photographs of Morton Arboretum Vanguard elm, Acc. no. 273-97; cirrusimage.com
External links
- http://fletcher.ces.state.nc.us/programs/nursery/metria/metria11/warren/elm.htm Warren, K., J. Frank Schmidt & Son Co. (2002). The Status of Elms in the Nursery Industry in 2000.
- http://www.mortonarb.org/plantinfo/plantclinic/phc/New-Elms-For-The-Landscape.pdf. Miller, F. (2002). New elms for the landscape and urban forest.