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Ulmus minor 'Retiro'
The Field Elm cultivar ''Ulmus minor'' 'Retiro' was raised from seed collected in 2002 from a tree growing in the El Retiro park in the centre of Madrid by researchers at the Escuela Técnica Superior de Ingenieros de Montes, Universidad Politėcnica de Madrid. 'Retiro' is one of seven cultivars found to have a very high resistance to Dutch Elm Disease, on a par with, if not greater than, the hybrid cultivar 'Sapporo Autumn Gold'. In the Madrid study, the appearance of the tree was rated 4 / 5. 〔Martin, J. et al. (2013). Seven Iberian Ulmus minor clones resistant to Dutch elm disease registered for their use as forest reproductive material. ''Journal of Biogeosciences & Forestry'', Vol. 8 pp172–180. Italian Society of Silviculture & Forest Ecology (SISEF).()〕
The other Spanish cultivars are: Ademuz, Dehesa de Amaniel, Dehesa de la Villa, Fuente Umbria, Majadahonda, Toledo.
==Description==
'Retiro' grew at a comparatively modest rate of 70 cm per annum in the trials at Puerta de Hierro, Madrid. The erect branches, devoid of corky tissue, form a globular crown. The leaves, on 7 mm petioles, are elliptic, typically oblique at the base and acuminate at the apex, the average length and width 71 × 42 mm, the margins doubly serrate. Foliar density relative to 'Sapporo Autumn Gold' is described as 'high'. 〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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