Ulmus 'Rebona'

Ulmus 'Rebona' is an American hybrid cultivar raised by the Wisconsin Alumni Research Foundation (WARF) as selection 'W916', derived from a crossing of Japanese Elm clone W43-8 = 'Reseda' with Siberian Elm clone W426 grown from seed collected from a street tree at Yankton, South Dakota.[1] The tree was registered in 1993 by Conrad Appel KG, of Darmstadt (ceased trading 2006) and is a sibling of 'New Horizon' (selection 'W917'). In Europe, 'Rebona' is marketed as a Resista elm protected under E U breeders' rights (E U council decision 2100/94).

Ulmus 'Rebona'
'Rebona', Berlin Heinersdorf-Treskowstrasse
Genus	Ulmus
Hybrid parentage	U. davidiana var. japonica × U. pumila
Cultivar	'Rebona'
Origin	US

Description

'Rebona' leaf

'Rebona' bears a close resemblance to its sibling 'New Horizon', but requires less maintenance owing to a better leader. The tree grows rapidly, developing a fastigiate pyramidal shape with ascending branches. The glossy clear-green leaves are comparatively small, though slightly larger than those of 'New Horizon'.[2]

Pests and diseases

'Rebona' is highly resistant to Dutch elm disease, rated 5 out of 5.[2]

Cultivation

'Rebona' has been widely planted as a street tree in Germany, the Netherlands, and to a lesser extent in France and the UK.[3]

Accessions

Europe

• Botanischer Garten Marburg , Marburg, Germany. No details available.
• Grange Farm Arboretum, Lincolnshire, UK. Acc. no. not known.
• Royal Botanic Gardens, Kew, UK. Acc. no. not known.
• Sir Harold Hillier Gardens, Romsey, UK. One tree planted Crookhill overflow parking area. Acc. no. 2018.0019
• Wijdemeren City Council, Netherlands. Elm Collection, first planted 2005 De Vijnen, Nederhorst den Berg. Used in elm trials Ankeveen 2009.

Nurseries

Europe

• Baumschule Grossbötzl Ort, Austria.
• Björkhaga Plantskola Veberöd, Sweden.
• Clasen & Co Rellingen, Germany.
• Eisele GmbH, , Darmstadt, Germany.
• Hilliers Nurseries , Liss, UK.
• Noordplant , Glimmen, Netherlands.
• Pépinières Rouy-Imbert Monfavet-Avignon, France.

References

1. Santamour, Frank S.; Bentz, Susan E. (May 1995). "Updated Checklist of Elm (Ulmus) Cultivars for use in North America". Journal of Arboriculture. 21 (3): 122–131. Retrieved 20 June 2016.
2. Heybroek, H. M., Goudzwaard, L, Kaljee, H. (2009). Iep of olm, karakterboom van de Lage Landen (:Elm, a tree with character of the Low Countries). KNNV, Uitgeverij. ISBN 978 90 5011 281 9
3. Brookes, A. H. (2020). Disease-resistant elm cultivars. Butterfly Conservation, Lulworth, England.