Christine Buisman (elm cultivar)

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The elm cultivar Christine Buisman is one of the early results of the Dutch elm breeding programme initiated in response to the less virulent form of Dutch elm disease that afflicted Europe's elms after the First World War. It was cloned in 1931 as 'No. 24', ostensibly from a selection of U. minor (reckoned to be U. x hollandica by Melville) found in Madrid in 1928 which offered some resistance to Dutch elm disease, and released for sale in 1936. However, the tree had not been thoroughly evaluated in the field, and quickly proved prone to cankers caused by Coral Spot fungus Nectria cinnabarina as it lacked resistance mechanisms to this fungus. Moreover, neither its shape nor foliage were considered very attractive, and it had limited resistance to sea winds; production soon ceased.

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. 135-54, 273-46
• Bartlett Tree Experts, acc. no. 1371
• Holden Arboretum acc. nos. 54-271, 55-446
• Longwood Gardens acc. no. 1967-0875
• Morton Arboretum acc. no. 223-49 (as Ulmus procera Christine Buisman)

[edit] Europe

• Brighton & Hove City Council, UK, NCCPG Elm Collection [1] (as Ulmus x hollandica Christine Buisman)

[edit] Nurseries

None known.

[edit] Etymology

The tree is named for Christine Buisman, one of the original team of elm researchers at Wageningen who discovered the cause of Dutch elm disease in 1927.

[edit] Synonymy

• Ulmus Buisman: Plant Buyer's Guide, ed. 6. 285, 1958, without description.
• Ulmus x hollandica Christine Buisman: Melville, and various arboreta listings in USA and Europe.
• Ulmus procera Christine Buisman: Morton Arboretum Catalogue 2006.

[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.
• Green, P. S. (1964). Registration of cultivar names in Ulmus. Arnoldia, Vol. 24. Arnold Arboretum, Harvard University. [1]
• 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.