Bea Schwarz (elm cultivar)

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The elm cultivar Bea Schwarz was cloned (as 'No. 62') at Wageningen, the Netherlands ostensibly from a selection of U. minor found in 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 Lutèce™. Specimens of the tree in the UK and the USA are treated as Ulmus × hollandica cultivars (after Fontaine, 1968).

Contents 1 Arboreta etc. accessions 1.1 North America 1.2 Europe 2 Nurseries 3 Etymology 4 Synonymy 5 References

[edit] Arboreta etc. accessions

[edit] North America

• Arnold Arboretum acc. nos. 151-61, 276-62
• Holden Arboretum acc. no. 57-1243
• Longwood Gardens acc. no. 1967-0876

[edit] Europe

• Brighton & Hove City Council, UK, NCCPG Elm Collection [1]

[edit] Nurseries

None known.

[edit] Etymology

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

[edit] Synonymy

None.

[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.
• Fontaine, F. J. (1968). Dendroflora No. 5, 37-55, 1968.
• 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
• Melville, R. (1978). On the discrimination of species in hybrid swarms with special reference to Ulmus and the nomenclature of U. minor (Mill.) and U. carpinifolia (Gled.). Taxon 27: 345-351.
• Went, J. C. (1954). Tijschr. Plantenziekten 60: 109-127, 1954.