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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" ...
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]
In a more academically-based project, most of the clones of the surviving European field elms that have been tested since the 1990s for innate resistance to Dutch elm disease by national research institutes in the EU, with a view to returning field elm to cultivation in Europe, [23] would be classified by Richens’s system as Ulmus minor subsp ...
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 American Elm cultivar Ulmus americana 'St. Croix' is a recent (2008) selection cloned from a large tree growing on a farm near Afton, Minnesota, [1] which has displayed a high resistance to Dutch elm disease (DED). [2] A U S patent, PP 20097, was granted in 2009.
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]
Lutèce exhibited a high resistance to Dutch elm disease when inoculated with unnaturally high doses of the causal fungus Ophiostoma novo-ulmi, and was rated 5 out of 5 in Dutch tests. [8] Tests in France by INRA confirmed the tree as 'highly resistant'.