| 词条 | Ulmus 'Cathedral' |
| 释义 |
| name = Ulmus 'Cathedral' | hybrid = U. davidiana var. japonica × U. pumila | genus = Ulmus | cultivar = 'Cathedral' | image = Ulmus Cathedral (amsterdam jean desmetstraat t.o. 34) 140608a.jpg | image_caption = 'Cathedral' in Jean Desmetstraat, Amsterdam | origin = WARF, Wisconsin, US }} Ulmus 'Cathedral' is a hybrid cultivar raised at University of Wisconsin–Madison (no. W44-25) patented in 1994. Arising from a chance crossing of the Japanese elm (female parent) and Siberian elm, seed was sent in 1958 by Prof. Nobuku Takahashi and his colleagues at the Sapporo Botanical Garden of Hokkaido University, Sapporo,[1] to Eugene Smalley at Wisconsin–Madison;[2][3] 'Cathedral' is thus a sibling of 'Sapporo Autumn Gold'. DescriptionThe tree is distinguished by its weeping form and large elliptic leaves, < 14 cm long by < 8 cm broad, almost the same size and shape of those of its female parent, the Japanese Elm, spinach green when mature, turning yellow and orange in autumn. [4] Pests and diseasesTests in the United States have found 'Cathedral' to be less resistant to Dutch elm disease than its WARF stablemates such as 'New Horizon', although damage is usually confined to the branch tips. Studies in France by the Institut National de la Recherche Agronomique (INRA) confirmed the tree as only 'moderately resistant'.[5] The leaves are also favoured by leaf hoppers and other insects that feed by piercing and sucking.[6] CultivationThe tree requires relatively high levels of maintenance owing to its predilection for breaks occasioned by branch inclusions. 'Cathedral' is widely available across the United States, and has also been commercially released in Europe. EtymologyThe tree was named by Mr Donald Willeke of Minneapolis, who observed that where planted in tight rows, a series of gothic cathedral-like arches was ultimately created between the trees. AccessionsNorth America
Europe
NurseriesNorth America
Europe
References1. ^Smalley, E. B. and Guries, R. P. Asian Elms: Sources of Disease and Insect Resistance, in Dunn, C P. (ed.). (2000).The Elms - Breeding, Conservation, and Disease Management. Springer Science + Business Media LLC., New York. {{ISBN|9781461370321}} 2. ^Smalley, E. B. & Lester, D. T. (1973). HortScience 8: 514–515, 1973. 3. ^Smalley, E. B. & Guries, R. P. (1993). Breeding Elms for Resistance to Dutch Elm Disease. Annual Review of Phytopathology Vol. 31 : 325–354. Palo Alto, California. 4. ^Santamour, J., Frank, S. & Bentz, S. (1995). Updated checklist of elm (Ulmus) cultivars for use in North America. Journal of Arboriculture 21 (3): 121-131. International Society of Arboriculture, Champaign, Illinois, US. 5. ^{{cite journal|last1=Pinon|first1=J.|title=Les ormes résistants à la graphiose|trans-title=Elms resistant to Dutch Elm Disease|journal=Forêt-entreprise|date=July 2007|issue=175|pages=37–41|url=http://www.foretpriveefrancaise.com/data/127219_p_1.pdf|accessdate=26 October 2017|publisher=IDF|location=Paris, France|issn=0752-5974}} 6. ^Giblin, C. P. & Gillman, J. H. (2006). Elms for the Twin Cities: A Guide for Selection and Maintenance. University of Minnesota. External links
3 : Hybrid elm cultivar|Ulmus articles with images|Ulmus |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。