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The starting-points for List of elm cultivars, hybrids and hybrid cultivars were fourfold: (1) Green's 'Registration of Cultivar Names in Ulmus ' (1964), [1] based on the contemporary nomenclature of elm species and wild hybrids; (2) Krüssmann's confirmation or correction of cultivar-names in his monumental Handbuch der Laubgehölze (1976); [2] (3) Heybroek's table of Netherlands research ...
Trees and shrubs hardy in Great ... C. M. (1996). New horizons in Dutch elm disease control. Pages 20–28 in: Report on ... "Elms resistant to Dutch elm disease" ...
A 300-year-old example growing in Grenzhammer, Ilmenau has allegedly been scientifically proven to be resistant to Dutch elm disease. [25] The Swedish Forest Tree Breeding Association at Källstorp produced triploid and tetraploid forms of the tree, but these proved no more resistant to Dutch elm disease than the normal diploid form. [26]
The tree succumbed to Dutch elm disease and was felled in 1968. A ring count established that it had begun life in the year 1701. [61] The "Great Elm Tree" at Phillips Academy in Andover, Massachusetts is believed to have been standing for at least 200 years. It is being well cared for and receives regular treatments for Dutch elm disease. [62]
'Plantyn' is no more resistant to Dutch elm disease than its Dutch contemporaries 'Dodoens' and 'Lobel' according to one source, rating 4 out of 5. [5] However, research published in France by the Institut National de la Recherche Agronomique (INRA) indicated that 'Plantyn' possesses a greater degree of disease resistance than the other two cultivars, although neither had actually been tested ...
The species and its cultivars are highly resistant, but not immune, to Dutch elm disease, and unaffected by the Elm Leaf Beetle Xanthogaleruca luteola. [2]
'Lobel' was rated 4 out of 5 ("good") in the Netherlands for its resistance to Dutch elm disease. [5] However, in trials conducted by the Istituto per la Protezione delle Piante, Italy, 'Lobel' suffered 50% defoliation and 35.5% dieback when inoculated with unnaturally high concentrations of the fungal pathogen, compared with 2.8% and 1.2% resp. for 'Sapporo Autumn Gold'.
'Wredei' was distributed by the Louis van Houtte and Späth nurseries in the late 19th century (Louis van Houtte described it in 1881 as a "superbe nouveauté"). [5] [6] Späth supplied one tree, as U. montana fastigiata aurea, to the Dominion Arboretum, Ottawa, in 1893, [7] and three in 1902 to the Royal Botanic Garden Edinburgh in 1902 as U. montana fastigiata Dampieri Wredei. [8] '
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