| 词条 | Ulmus parvifolia 'Pathfinder' |
| 释义 |
| name = Ulmus parvifolia 'Pathfinder' | species = Ulmus parvifolia | cultivar = 'Pathfinder' | origin = US }} The Chinese Elm cultivar Ulmus parvifolia 'Pathfinder' is another development by A. M. Townsend of the USDA National Arboretum registered in 1990. DescriptionThe tree is of modest proportions, rarely reaching > 11 m in height, with a crown slightly less in diameter. The leaves are a glossy yellow-green, and variously described as turning 'grayish red' or 'brilliant red' in autumn. The trunk sports the typical mottled bark.[1][2] Pests and diseasesThe species and its cultivars are highly resistant, but not immune, to Dutch elm disease, and unaffected by the Elm Leaf Beetle Xanthogaleruca luteola.[3] However, tolerance of Elm Yellows in the USA was found to be poor. [4] Cultivation'Pathfinder' is not known to be in cultivation beyond North America. AccessionsNorth America
References1. ^Amer. Nurseryman, 175(4): 42, 1992. 2. ^Spongberg, S. A. (1991), HortScience 26: 476, 1991. 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. ^Sinclair, W. A., Townsend, A. M., Griffiths, H. M., & Whitlow, T. H. (2000). Responses of six Eurasian Ulmus cultivars to a North American elm yellows phytoplasma. Plant disease, Vol. 84, No.12, 1266-1270. American Phytopathological Society, St. Paul, MN External links
3 : Chinese elm cultivar|Ulmus articles missing 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。