Ulmus parvifolia 'Emer II'
| Ulmus parvifolia | |
|---|---|
| Cultivar | 'Emer II' or 'Emerald Vase' = Allee |
| Origin | USA |
The Chinese Elm cultivar Ulmus parvifolia 'Emer II' or 'Emerald Vase' (selling name Allee) was cloned from a tree planted circa 1910 on the University of Georgia campus at Athens.
Description
Allee can reach a height of about 15 m, with a more upright crown shape than its stablemate Athena, its spread approximately 13 m, with arching branches bearing medium green, glossy leaves turning orange to rust red in autumn. [1] The exfoliating, mottled bark has a puzzle-like pattern, and is considered attractive.[1]
Pests and diseases
The species and its cultivars are highly resistant, but not immune, to Dutch elm disease, and unaffected by the Elm Leaf Beetle Xanthogaleruca luteola [2]. As with the species overall, damage caused by Japanese Beetle is relatively slight (< 8% defoliation).[2]
Cultivation
Allee is reputedly drought tolerant, but in the elm trials [3] conducted by Northern Arizona University at Holbrook, Arizona, Allee proved unsuited to the hot, arid climate and sustained over 50% mortality in its first year, as did its sibling Athena. The tree is being evaluated in the National Elm Trial [4] coordinated by Colorado State University. Allee has reached Australia, but is not known to have been introduced to Europe.
Accessions
- North America
- Bartlett Tree Experts, North Carolina. Acc. no. 2001-166
- Holden Arboretum. Acc. no. 98-26
- Brenton Arboretum, Dallas Center, Iowa. One tree, acquired 2009. Acc. no. not known.
- Scott Arboretum. Acc. no. 2000-006
- Smith College. Acc. nos 302, 33603
- University of Idaho arboretum. One tree. Acc. no. 1998010
- U S National Arboretum [5], Washington, D.C., USA. Acc. no. 64442
Nurseries
- North America
(Widely available)
- Australasia
References
- ^ Santamour, F. S., & Bentz, S. E. Updated checklist of elm (Ulmus) cultivars for use in North America. Journal of Arboriculture, 21(3): May, 1995.
- ^ 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.
External links
- http://www.ces.ncsu.edu/depts/hort/consumer/factsheets/trees-new/cultivars/ulmus_parvifolia.htm Ulmus parvifolia cultivar list.
- http://fletcher.ces.state.nc.us/programs/nursery/metria/metria11/warren/elm.htm Return of the Elm - the status of elms in the nursery industry in 2000. Warren, K., J. Frank Schmidt and Co.
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