‘Valley Forge’ – green summer foliage, changing to yellow in fall. Ulmus americana 'Valley Forge' and 'New Harmony' [electronic resource] / United States National Arboretum. The foliage of leathery, dark green leaves, 3-6 in. Retail nurseries started selling ‘New Harmony’ and ‘Valley Forge.’ In urban areas, take them to a designated disposal site. Choose the smaller 3'x5' and 4'x6' or go larger with the 30'x50' and 30'x60'. Learn tips for creating your most beautiful (and bountiful) garden ever. Dutch elm disease spread East quickly; within two years, American elm trees in New Jersey were falling prey to the deadly fungus. nos. It also has demonstrated excellent resistance to … It was a street typically lined with these majestic giants, which unfurled their weeping branches Rapunzel-like over the heads of passersby, affording shade on hot summer afternoons. All North American elms are susceptible to DED to some degree. Buy New Harmony American Elm online at McKay Nursery Company. This silent killer arrived in a shipment of logs from France. The deadly fungus, it turns out, can spread underground from the roots of one victim to the roots of another nearby. Best Dutch elm disease-tolerance among American elms tested. This is what happened when the roots of adjacent American elm trees "grafted" together, essentially linking the lives of what had been two distinct entities. ‘New Harmony’ – second to Valley Forge in Dutch elm disease tolerance. Named U. americana "Valley Forge" and U. americana "New Harmony," Townsend's clones are now on the market. Bruce Carley, in his article on saving American elm trees from Dutch elm disease, paints a pretty picture of Main Street USA in the first half of the 20th century. This page was last edited on 10 June 2020, at 17:48. Pyrus calleryana ‘Holmford’ New Bradford Pear “ $160 Pyrus calleryana ‘Chanticleer’ Chanticleer Pear “ $160 Pyrus calleryana ‘Redspire’ Redspire Pear “ $160 Ulmus Americana ‘Valley Valley Forge American Elm “ $250 Forge’. Ulmus americana 'Jefferson' Ulmus americana 'New Harmony' Ulmus americana 'Valley Forge' Ulmus americana Prairie Expedition® Ulmus japonica x wilsoniana Accolade® Ulmus parvifolia Allee® Ulmus propinqua Emerald Sunshine® Ulmus Triumph™ Inconspicuous yellow-green catkins appear in spring before the leaves emerge. Evaluation of 19 American Elm Clones for Tolerance to Dutch Elm Disease, http://www.extension.iastate.edu/Publications/SUL4.pdf, https://web.archive.org/web/20061205022500/http://www.ces.ncsu.edu/fletcher/programs/nursery/metria/metria11/warren/elm.htm, Elm species, varieties, hybrids, hybrid cultivars and species cultivars, A. Ross Central Park = Central Park Splendor, https://en.wikipedia.org/w/index.php?title=Ulmus_americana_%27New_Harmony%27&oldid=961839196, Articles with dead external links from July 2018, Articles with permanently dead external links, Creative Commons Attribution-ShareAlike License, Maryland Agricultural Research Service, US. If signs appear, dispose of infected American elms properly. Introduced by the U.S. National Arboretum, this tree features the classic vase shape of the American elm along with a high level of disease tolerance. In the late 1990s, approximately 25 years of work with U. americana came to fruition when the announcement was made that Townsend had succeeded with two new strains: American elm tree clones resistant to Dutch elm disease became a reality. The Dutch elm disease had "killed 77 million trees by 1970," wrote Phil McCombs in a 2001 Washington Post story that begins with this picturesque description of how American elm trees once lined the streets of many a town: "Once upon a time in America, great leafy high-arching cathedrals of elms lined the streets of villages and cities from the Atlantic to the Rockies, casting a deep cool shade upon life's turmoil.". Avoid pruning American elms from April through August. In the trials at U C Davis, the trees remained free of leaf curling aphids (Eriosoma), unlike its U. americana stablemates 'Valley Forge' and 'Princeton'. A triploid U. americana known as ‘Jefferson' has also been planted. The original parent tree (located on a roadside in Ohio) is already over 20 m high, with a slightly greater crown spread. Beautiful ( and bountiful ) garden ever the roots of one thus became the demise of one thus became demise! 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