Ulmus parvifolia 'Emer II' or 'Emerald Vase' (selling name Allee) is a Chinese Elmcultivar that 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]
Bark
Branching
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).[3]
Cultivation
Allee is reputedly drought tolerant, but in the elm trials [2] 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[3] coordinated by Colorado State University. Allee has been introduced to Australia and Europe [citation needed], and was marketed briefly in England by the Thornhayes Nursery, Devon.
Accessions
North America
Bartlett Tree Experts, North Carolina, US. Acc. no. 2001-166
^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.
