Ulmus 'Morton Plainsman'
Script error: No such module "Infobox". Ulmus 'Morton Plainsman' (selling name Template:Tdes) is a hybrid cultivar raised by the Morton Arboretum from a crossing of Siberian Elm (female parent) and a Japanese Elm grown from openly pollinated seed donated by the Agriculture Canada Research Station at Morden, Manitoba. Tested in the US National Elm Trial coordinated by Colorado State University, [1]Template:Tdes averaged a survival rate of 78% after 10 years.[1]
Description
Template:Tdes has modest upright growth, increasing in height by an average of 0.8 m in an assessment at U C Davis,[2] with leaves much the same size and colour of the American Elm. [2] However, its performance in the southern United States has not impressed, and it was dismissed, along with its Morton stablemates Template:Tdes and Template:Tdes, 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 Dutch elm disease in the US, Template:Tdes remains very susceptible to pests such as the elm-leaf beetle Xanthogaleruca luteola[2] ,[3] Japanese beetle,[4] and cankerworms.
Cultivation
In trials at the University of Minnesota, Template:Tdes was found to have the second highest (after [[Ulmus 'Morton Red Tip' = Danada Charm|Template:Tdes]]) 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
Template:Tdes was crossed with the hybrid cultivar [[Ulmus 'Morton' = Accolade|Template:Tdes]]; a selection from the resultant seedlings was marketed under the name 'Charisma', later changed to [[Ulmus 'Morton Glossy' = Triumph|'Morton Glossy' = Template:Tdes]].
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
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- ↑ Script error: No such module "Citation/CS1".
- ↑ a b McPherson, G. et al. (2008). National elm trial: Initial report from Northern California. Western Arborist, Fall 2009, 32–36.
- ↑ Script error: No such module "citation/CS1".
- ↑ 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.
- ↑ Script error: No such module "Citation/CS1".
- ↑ Ware, G. (1992). Morton. Arb. Quarterly 28(1): 1–5, 1992.
- ↑ Shirazi, A. M. & Ware, G. H. (2004). Evaluation of New Elms from China for Cold Hardiness in Northern Latitudes. International Symposium on Asian Plant Diversity & Systematics 2004, Sakura, Japan.
- ↑ Photographs of Morton Arboretum Template:Tdes elm, Acc. no. 273-97; cirrusimage.com
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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.
Template:Elm species, varieties, hybrids, hybrid cultivars and species cultivars