Ulmus × hollandica 'Bea Schwarz'

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Ulmus × hollandica 'Bea Schwarz'
RN Ulmus Bea Schwarz (noordzijde amsterdam) 040606c.jpg
'Bea Schwarz', Amsterdam.
Hybrid parentage U. glabra × U. minor
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[edit]

The tree was considered of poor growth and shape.[2]

Pests and diseases[edit]

Moderately resistant to Dutch elm disease, and more resistant to Coral Spot fungus Nectria cinnabarina than its forebear 'Christine Buisman'.

Cultivation[edit]

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[edit]

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[edit]

Etymology[edit]

The tree is named for Bea Schwarz, the Dutch phytopathologist who identified Dutch elm disease in the 1920s.

Accessions[edit]

North America[edit]

Europe[edit]

Nurseries[edit]

Europe[edit]

References[edit]

  1. ^ F. J., Fontaine (1968). "Ulmus". Dendroflora. 5: 37–55. Retrieved 30 August 2017. 
  2. ^ Photograph of free-standing 'Bea Schwarz' elm, [1].
  3. ^ 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. 
  4. ^ Heybroek, H.M. (1993). "The Dutch Elm Breeding Program". In Sticklen, Mariam B.; Sherald, James L. Dutch Elm Disease Research. New York, USA: Springer-Verlag. pp. 16–25. ISBN 978-1-4615-6874-2. Retrieved 26 October 2017. 
  5. ^ Went, J. C. (1954). Tijschr. Plantenziekten 60: 109-127, 1954.
  6. ^ Johnson, O. (2011). Champion trees of Britain & Ireland, p.167. Kew Publishing, Kew London. ISBN 978-1-84246-452-6
  7. ^ "List of plants in the {elm} collection". Brighton & Hove City Council. Retrieved 23 September 2016. 

External links[edit]