| 词条 | Ulmus parvifolia 'Zettler' = Heritage |
| 释义 |
| name = Ulmus parvifolia 'Zettler' | species = Ulmus parvifolia | cultivar = 'Zettler' = {{tdes|Heritage|caps}}™ | origin = US }} The Chinese Elm cultivar Ulmus parvifolia 'Zettler' (selling name {{tdes|Heritage|caps}}™) is one of three recent (< 2006) American introductions selected for their cold hardiness (USA zone 4 tolerant). Description{{tdes|Heritage|caps}} has a strong, upright habit and excellent branching structure, bearing deep green glossy foliage that turns to an attractive autumn colour in some years.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.[1] Cultivation{{tdes|Heritage|caps}} was selected from over 20,000 seedlings in 1975, and subsequently proved to be one of the hardiest Chinese or Lacebark Elms available in the United States, surviving - 33° C (- 27° F) in Illinois during the winter of 1989 without sustaining any damage whatsoever. {{tdes|Heritage|caps}} is not known to have been introduced to Europe or Australasia.AccessionsNone known. Nurseries
References1. ^{{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}} External links
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