''Ulmus × hollandica'' 'Bea Schwarz'
| Ulmus × hollandica | |
|---|---|
_040606c.jpg) 'Bea Schwarz', Amsterdam. | |
| Cultivar | 'Bea Schwarz' |
| Origin | Netherlands |
The elm cultivar Ulmus × hollandica 'Bea Schwarz' was cloned (as No. 62) at Wageningen in the Netherlands, by the elm disease committee, ostensibly from a selection of Ulmus minor found in France in 1939. However, specimens of the tree grown in the UK and the United States are treated as Ulmus × hollandica (after Fontaine [1]).
Description
The tree was considered of poor growth and shape.[2]
Pests and diseases
Moderately resistant to Dutch elm disease, and more resistant to Coral Spot fungus Nectria cinnabarina than its forebear 'Christine Buisman'.
Cultivation
Commercial production was discontinued soon after its release in 1948.[3][4][5] Nevertheless, its moderate resistance to Dutch elm disease saw it, or its selfed progeny, successfully used in later Dutch hybridizations, notably 'Nanguen' = Lutèce.
Notable trees
The largest known examples in the UK grow along Crespin Way, Hollingdean, Brighton; planted in 1964, they measured 19 m high by 50 cm d.b.h. in 2009.[6]
Hybrid cultivars
- 'Nanguen' = Lutèce, 'Clusius', 'Lobel', (both from crossings with 'Bea Schwarz' selfed), 'Amsterdam' (from an open pollination?).
Etymology
The tree is named for Bea Schwarz, the Dutch phytopathologist who identified Dutch elm disease in the 1920s.
Accessions
North America
- Arnold Arboretum. Acc. nos. 151–61, 276–62
- Holden Arboretum. Acc. no. 57–1243
- Longwood Gardens. Acc. no. 1967–0876
Europe
- Brighton & Hove City Council, UK, NCCPG Elm Collection.[7]
Nurseries
Europe
- Noordplant , Glimmen, The Netherlands
References
- ↑ Fontaine, F. J. (1968). Dendroflora No. 5, 37-55, 1968.
- ↑ Photograph of free-standing 'Bea Schwarz' elm, .
- ↑ Heybroek, Hans M. (1983). Burdekin, D.A., ed. "Resistant elms for Europe" (PDF). Forestry Commission Bulletin (Research on Dutch elm disease in Europe). London: HMSO (60): 108–113.
- ↑ Heybroek, H. M. (1993). The Dutch Elm Breeding Program. In Sticklen & Sherald (Eds.)(1993). Dutch Elm Disease Research, Chapter 3. Springer Verlag, New York, USA
- ↑ Went, J. C. (1954). Tijschr. Plantenziekten 60: 109-127, 1954.
- ↑ Johnson, O. (2011). Champion trees of Britain & Ireland, p.167. Kew Publishing, Kew London. ISBN 978-1-84246-452-6
- ↑ "List of plants in the {elm} collection". Brighton & Hove City Council. Retrieved 23 September 2016.