Clusius (elm hybrid)

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Ulmus Clusius
Hybrid parentage
(U. glabra Exoniensis x U. wallichiana) x U. minor Bea Schwarz, selfed
Cultivar
Clusius
Origin
Wageningen, The Netherlands

A Dutch hybrid elm raised at Wageningen, Clusius was released for sale in 1983. Derived from a crossing of the same Dutch clones that produced the fastigiate Lobel in 1973: 202 (U. glabra Exoniensis x U. wallichiana) and 336 (U. minor Bea Schwarz, selfed), but with larger leaves and broader crown. However, its resistance to Dutch elm disease has proven to be only marginally greater and thus, while it remains commonly for sale in Europe (including the UK), its planting where the disease remains prevalent cannot be recommended. Clusius is not known to have been introduced to the USA, but featured in New Zealand government trials during the 1990s at the Hortresearch station, Palmerston North.

The hybrid is named for Carolus Clusius, a Dutch naturalist of the Renaissance.

[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