- Ulmus 'Patriot'
Infobox Cultivar | name = "
Ulmus " hybrid
hybrid = 'Urban' × 'Prospector'
cultivar = 'Patriot'
origin = USA The American hybrid cultivar 'Patriot' [http://www.usna.usda.gov/Newintro/Patriot1.html] is a U. S.Department of Agriculture introduction derived in1980 from a crossing of the American hybrid 'Urban' with the Wilson's Elm (now treated asJapanese Elm "U. davidiana" var. "japonica") cultivar 'Prospector'.Description
The tree develops an upsweeping crown, ultimately becoming a fastigiate vase-shape. The foliage is glossy dark green, turning yellow in autumn Santamour, J., Frank, S. & Bentz, S. (1995). Updated checklist of elm (Ulmus) cultivars for use in North America. "Journal of Arboriculture", 21:3 (May 1995), 121-131. International Society of Arboriculture, Champaign, Illinois, USA.] .
Pests and diseases
'Patriot' appears immune to
Elm Yellows and has a very high resistance toDutch elm disease , exhibiting 100% survival seven years after DED inoculation, but only a moderate tolerance of the elm leaf beetle "Xanthogaleruca luteola " [http://commons.wikimedia.org/wiki/Xanthogaleruca_luteola] Townsend, A. M. & Douglass, L. W. (2004). Evaluation of elm clones for tolerance of Dutch elm disease. "Journal of Arboriculture" 21(3). International Society of Arboriculture, Champaign, IL.] .Cultivation
The tree is capable of very rapid growth, the parent tree in
Ohio attaining a height of 13 m in as many years after it was sown. It is also extremely cold hardy; in artificial freezing tests at the Morton Arboretum 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 .] theLT50 (temp. at which 50% of tissues die) was found to be - 38 °C. 'Patriot' performs best in moist but well-drained soils, and in trials byNorthern Arizona University in the hot and arid climate of Holbrook easternArizona [http://www.for.nau.edu/cms/content/view/512/706/] , it did not perform as well as the likes of 'Frontier' and 'Regal', but not as badly as others such as 'New Horizon' and 'Sapporo Autumn Gold'. In the cooler climes ofMinnesota , it was recommended for every forester's 'Top Ten' list of urban trees Giblin, C. P. & Gillman, J. H. (2006). "Elms for the Twin Cities: A Guide for Selection and Maintenance." University of Minnesota.] . The tree is currently being evaluated in the National Elm Trial [http://treehealth.agsci.colostate.edu/research/nationalelmtrial/NET_Cultivars.htm] coordinated byColorado State University .'Patriot' is not known to have been introduced to
Australasia .Accessions
North America
*
Arnold Arboretum acc. no. 136-98
*Bartlett Tree Experts acc. nos. 2001-252/3/4, 2001-492/3, 2003-965, 2003-1007/8, 00-224
*Chicago Botanic Garden , Glencoe,Illinois . 1 tree, in the Parking Lots.
*Holden Arboretum acc. nos. 00-125, 2001-154
*Morton Arboretum acc. no. 122-2001Europe
*Grange Farm,
Sutton St. James ,Spalding ,Lincolnshire ,UK . Acc. No. 505Nurseries
North America
*J. Frank Schmidt & Son [http://www.google.co.uk/search?hl=en&q=J.+Frank+Schmidt+&btnG=Google+Search&meta=] , Boring,
Oregon .
*Johnson's Nursery [http://www.johnsonsnursery.com/] ,Menomonee Falls ,Wisconsin
*Pea Ridge Forest [http://www.pearidgeforest.com/index.cfm?fuseaction=plants.main&alphaKey=U-Z&whichName=genus&showIntro=0] , Hermann,Missouri
*Sunshine Nursery [http://www.sunshinenursery.com/catalogue.htm] , Clinton,Oklahoma .References
External links
*http://www.extension.iastate.edu/Publications/SUL4.pdf Summary, inc. photographs, of elm cultivars resistant to Dutch elm disease available in the USA.
*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".
Wikimedia Foundation. 2010.
