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Dutch elm disease (DED) is a fungal disease that has ravaged the American elm, causing catastrophic die-offs in cities across the range. It has been estimated that only approximately 1 in 100,000 American elm trees is DED-tolerant, most known survivors simply having escaped exposure to the disease. [19]
However, 'Princeton' has not proven resistant in Europe, where the main vector of the disease—the larger elm bark beetle, Scolytus scolytus—is capable of introducing far more fungal spores into the tree; many of the 50 trees planted at Highgrove House in the south-west of England in 2006 had died from Dutch elm disease by 2011.
A row of Princeton elm trees, which are moderately resistant to Dutch elm disease, at Scripps College in Claremont, California. [31] Efforts to develop DED-resistant cultivars began in the Netherlands in 1928 and continued, uninterrupted by World War II, until 1992. [32]
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]
Along with being DED-resistant, ‘Frontier’ is also highly tolerant of elm yellows disease, another nemesis of elm trees. It rarely flowers so it is virtually seedless. Height: 25 feet. Width ...
Testing in laboratory conditions by the United States Department of Agriculture from 1992 to 1993 revealed that 'Princeton' had some resistance to Dutch elm disease (DED), [6] [7] [8] although the original Princeton elm, which grew in Princeton Cemetery and was estimated to be over 150 years old, was felled in April 2005 after suffering 60 percent dieback, attributed by some accounts to Dutch ...
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