Bea Schwarz (elm cultivar)

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The elm cultivar Bea Schwarz was cloned at Wageningen, the Netherlands from a selection of U. minor from France in 1939. Although more resistant to Coral Spot fungus Nectria cinnabarina than its forebear Christine Buisman, it had poor growth and shape, and production was discontinued soon after its commercial release in 1948. Nevertheless, its moderate resistance to Dutch elm disease saw its successful use in later Dutch hybridizations, notably LUTECE™.

Specimens of the tree are retained in the UK at the NCCPG elm collection held by Brighton & Hove City Council, where it is erroneously listed as an Ulmus × hollandica cultivar. In the USA specimens are grown at the Arnold Arboretum, Holden Arboretum, and Longwood Gardens. The tree is not known to have been introduced to Australasia.

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

[edit] References

• Burdekin, D. A. & Rushforth, K. D. (Revised by Webber J. F. 1996). Elms resistant to Dutch elm disease. Arboricultural Research Note 2/96. Arboricultural Advisory and Information Service, Alice Holt, Farnham, UK.
• Heybroek, H. M. (1983). Resistant Elms for Europe. In Burdekin, D. A. (Ed.) Research on Dutch elm disease in Europe. For. Comm. Bull. 60. pp 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