| Ulmus davidiana var. japonica | |
|---|---|
| Details | |
| Cultivar |
'JFS-Bieberich' Emerald Sunshine |
| Origin | Sunshine Nursery, Oklahoma, USA |
The Japanese Elm Ulmus davidiana var. japonica Rehd. Nakai (formerly U. propinqua C. K. Schneid.) cultivar 'JFS-Bieberich' (Emerald Sunshine), is a new clone from the Sunshine Nursery, Oklahoma, derived from seed collected in China by proprietor Steve Bieberich.
Contents |
The tree attains a height of 9 m and develops a neat vase shape, the crown < 7.5 m in width. Emerald Sunshine is distinguished by its thick, deep-green leaves [1] (turning dull yellow in the fall) and stout stem. Trees planted as part of the National Elm Trial at the Bowley Plant Science Teaching Center, U C Davis, in northern California grew comparatively slowly, increasing in height by 1 m and d.b.h. by 1.6 cm per annum. [1] The tree was summarized by Michael A. Dirr, Professor of Horticulture at the University of Georgia as "impressive" [2].
The tree is resistant to Dutch elm disease and Elm Yellows (Phloem necrosis). Foliage of trees under assessment at the aforementioned National elm trial site at U C Davis suffered a minimal amount of damage caused by the elm leaf beetle Xanthogaleruca luteola [1], whilst damage caused by Japanese Beetle in trials at the University of Kentucky was found to be slight, owing to the dense pubescence on the underside of the leaves. [2] [3]
'JFS-Bieberich' is tolerant of high pH levels and soil compaction, and is also highly resistant to desiccating summer winds of the Plains [4]. The tree is not known to have been introduced to Europe or Australasia.
Named (JFS) for the J. Frank Schmidt nursery in Oregon, and (Bieberich) for the proprietor of the Sunshine Nursery, in Oklahoma.