Ulmus 'Wanoux' = Vada

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Ulmus hybrid
Ulmus VADA leaves.JPG
Hybrid parentage 'Plantyn' × 'Plantyn' selfed
Cultivar 'Wanoux' = Vada
Origin Netherlands

Ulmus 'Wanoux' (selling name Vada™) is a Dutch hybrid cultivar arising from the crossing of 'Plantyn' with another selfed (self-pollinated) specimen of 'Plantyn'. Originally identified as clone No. 762, it was selected for assessment by the French Institut National de la Recherche Agronomique (INRA), which patented it as 'Wanoux' (Vada) in 2006.

Description[edit]

Vada is a more fastigiate tree primarily intended for street planting. The glossy, dark-green leaves, < 11 cm long by 8 cm wide, are coarsely toothed and have conspicuous venation [1]

Pests and diseases[edit]

Tests in France by INRA found the tree to be 'highly resistant' to Dutch elm disease, exhibiting the lowest wilting percentage of all the clones trialled, making it comparable with 'Sapporo Autumn Gold' [2] However, the presence of U. wallichiana in the ancestry of Vada poses the risk of susceptibility to elm yellows (phloem necrosis), which seriously damaged its Dutch stablemate 'Lobel' used as a control in the Italian elm breeding programme.[3]

In trials in southern England, the leaves were found to remain completely free of Black Spot.[4]

Cultivation[edit]

Vada has moderate vigour, attaining a height of 14 m at 20 years of age in France. In trials conducted by Butterfly Conservation in England, the tree has proven tolerant of waterlogged ground in winter, surviving over three months' inundation on poorly drained Brickearth soils at Horsea Island in Portsmouth Harbour.[4] The tree is reputedly easily propagated from cuttings.

Vada was introduced to North America in 2010, with the supply of two small specimens to the USDA, Washington, D.C.; they were released from quarantine in 2013. Vada is not known to have been introduced to Australasia.

Notable trees[edit]

Former French prime minister Lionel Jospin insisted on planting an elm, the tree of the 'Left' when, in keeping with tradition, he was obliged to plant a tree in the garden of the Hôtel Matignon, his official residence in Paris, in 1998. He chose Vada, then still known by its Dutch trial identity of '762'.

Etymology[edit]

The selling name VADA is the ancient Roman name for the town of Wageningen, in the Netherlands, where the clone was raised.

Accessions[edit]

Europe[edit]

North America[edit]

References[edit]

  1. ^ Pinon, J. 2007). Les ormes résistants à la graphiose (:Elms resistant to Dutch Elm Disease). Forêt-entreprise, No. 175 - Juillet 2007, p 37-41, IDF, Paris, France. http://www.foretpriveefrancaise.com/data/info/127219-P.pdf
  2. ^ Pinon, J., Lohou, C. & Cadic, A. (1998). Hybrid Elms (Ulmus Spp.): Adaptability in Paris and behaviour towards Dutch elm disease (Ophiostoma novo-ulmi). Acta Horticulturae 496, 107-114, 1998.
  3. ^ Mittempergher, L., (2000). Elm Yellows in Europe. In: The Elms, Conservation and Disease Management. pp.103-119. Dunn C.P., ed. Kluwer Academic Press Publishers, Boston, USA.
  4. ^ a b Brookes, A. H. (2012). Disease-resistant elm cultivars, Butterfly Conservation trials report, 2nd revision, 2012. Butterfly Conservation, Hants & IoW Branch, England. [1]