Ulmus 'Bea Schwarz'

Infobox Cultivar | name = "Ulmus"
cultivar = 'Bea Schwarz'


image_caption = 'Bea Schwarz', Amsterdam. Photo: Ronnie Nijboer, Bonte Hoek kwekerijen
origin = NetherlandsThe elm cultivar 'Bea Schwarz' was cloned (as No. 62) at Wageningen, the Netherlands ostensibly from a selection of "Ulmus minor" found in France in 1939.

Description

The tree was considered of poor growth and shape.

Pests and diseases

Moderately resistant to Dutch elm disease, and more resistant to Coral Spot fungus "Nectria cinnabarina" than its forebear 'Christine Buisman'.

Cultivation

Commercial production was discontinued soon after its release in 1948 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] Went, J. C. (1954). "Tijschr. Plantenziekten" 60: 109-127, 1954. ] . Nevertheless, its moderate resistance to Dutch elm disease saw it, or its selfed progeny, successfully used in later Dutch hybridizations, notably 'Nanguen' (Lutèce TM). Specimens of the tree in the UK and the USA are treated as "Ulmus × hollandica" cultivars (after Fontaine Fontaine, F. J. (1968). "Dendroflora" No. 5, 37-55, 1968.] ).

Hybrid cultivars

*'Nanguen' (Lutèce TM)
*Bea Schwarz selfed progeny: 'Clusius', 'Lobel'

Etymology

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

Accessions

North America

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

Europe

*Brighton & Hove City Council, UK, NCCPG Elm Collection [http://www.brighton-hove.gov.uk/index.cfm?request=c1108042] . Crespin Way, Hollingdean 30 trees planted in 1964, and include the UK Champion, 22 m high, 33 cm d.b.h. in 1998 Johnson, Owen (ed.) (2003). "Champion Trees of Britain & Ireland". Whittet Press, ISBN 9781873580615.] .. University of Sussex Student Residency, Lewes Road, Falmer (3 trees - 2007).

References