| 词条 | Ulmus 'Morton Red Tip' = Danada Charm |
| 释义 |
| name = Ulmus 'Morton Red Tip' | hybrid = Ulmus 'Morton' = {{tdes|Accolade|caps}} open pollination | genus = Ulmus | cultivar = 'Morton Red Tip' = {{tdes|Danada Charm|caps}}™ | image = Danada Charm.jpg | origin = US }} Ulmus 'Morton Red Tip' (selling name {{tdes|Danada Charm|caps}}) is a hybrid cultivar raised by the Morton Arboretum from an open pollination of {{tdes|Accolade|caps}}. The tree has occasionally been reported as a hybrid of {{tdes|Accolade|caps}} with the Siberian Elm Ulmus pumila,[1] an error probably owing to the commercial propagation of the tree by grafting onto U. pumila rootstocks. Description{{tdes|Danada Charm|caps}} has a graceful, vase-shaped habit resembling the American Elm Ulmus americana with foliage tinged red on emergence.Pests and diseasesAlthough resistant to Dutch elm disease in the US, {{tdes|Danada Charm|caps}} is very susceptible to the elm leaf beetle Xanthogaleruca luteola [2][3], Japanese Beetle,[4] and Gypsy moth; it is also moderately preferred by cankerworms.[5][6] Cultivation{{tdes|Danada Charm|caps}} is very cold hardy; in artificial freezing tests at the arboretum [7] the LT50 (temp. at which 50% of tissues die) was found to be - 31 °C. However, the tree is notorious for its stem breakage owing to narrow crotch angles and included bark; in trials at the University of Minnesota it had the unhappy distinction of being the worst of 17 cultivars for breakage.[8] The tree is currently being evaluated in the National Elm Trial coordinated by Colorado State University.{{tdes|Danada Charm|caps}} is being promoted by the Chicagoland Grows corporation but is not widely available in the United States. Very rare in Europe, it is not known (2016) to have been introduced to Australasia.Etymology{{tdes|Danada Charm|caps}} is named for the Daniel F. & Ada L. Rice Foundation, which helped sponsor the elm breeding program at the Morton Arboretum.Accessions
Nurseries
References1. ^http://www.fs.fed.us/psw/programs/cufr/products/CUFR_780_Elm_trials_2009.pdf 2. ^McPherson, G. et al. (2008). National elm trial: Initial report from Northern California. Western Arborist, Fall 2009, pp 32-36. 3. ^{{Cite web|url=http://www.sunshinenursery.com/survey.htm|access-date=17 July 2017|archiveurl=https://web.archive.org/web/20110719132152/http://www.sunshinenursery.com/survey.htm|title=Elm Leaf Beetle Survey|archive-date=2011-07-19}} 4. ^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, pp 15, 16. University of Kentucky. 5. ^Guries, R. P. & Smalley, E. B., (1986), Proc. Third Nat. Urban Forestry Conf., pp 214–218, 1986, Orlando, Florida. 6. ^{{cite journal |last1=Santamour |first1=Frank S. |last2=Bentz |first2= Susan E. |date=May 1995 |title=Updated Checklist of Elm (Ulmus) Cultivars for use in North America|url=http://joa.isa-arbor.com/request.asp?JournalID=1&ArticleID=2673&Type=2|journal=Journal of Arboriculture |volume=21 |number=3|pages=122–131 |access-date=20 June 2016}} 7. ^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. 8. ^Giblin, C. P. & Gillman, J. H. (2006). Elms for the Twin Cities: A Guide for Selection and Maintenance. University of Minnesota. External links
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