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Dutch elm disease. Dutch elm disease (DED) is caused by a member of the sac fungi (Ascomycota) affecting elm trees, and is spread by elm bark beetles. Believed to be originally native to Asia, the disease was accidentally introduced into America, Europe, and New Zealand. In these regions it has devastated native populations of elms that did not ...
Description. Ulmus rubra is a medium-sized deciduous tree with a spreading head of branches, [4] commonly growing to 12–19 metres (39–62 feet), very occasionally over 30 m (98 ft) in height. Its heartwood is reddish-brown. The broad oblong to obovate leaves are 10–20 centimetres (4–8 inches) long, rough above but velvety below, with ...
Ulmus americana, generally known as the American elm or, less commonly, as the white elm or water elm, [a] is a species of elm native to eastern North America. The trees can live for several hundred years. It is a very hardy species that can withstand low winter temperatures, but it is affected by Dutch elm disease.
The original Camperdown Elm, replanted near the location of its discovery c.1840 in Camperdown Park, Dundee; image taken in 1989. The Wych Elm cultivar Ulmus glabra 'Camperdownii', commonly known as the Camperdown Elm, was discovered about 1835–1840 (often mis-stated as '1640') as a young contorted elm (a sport) growing in the forest at Camperdown House, in Dundee, Scotland, by the Earl of ...
The field elm (Ulmus minor) cultivar 'Atinia' , [1] commonly known as the English elm, formerly common elm and horse may, [2] and more lately the Atinian elm, [3] was, before the spread of Dutch elm disease, the most common field elm in central southern England, though not native there, and one of the largest and fastest-growing deciduous trees in Europe.
The dark green leaves are large, < 17 cm (avg. 12 cm) long by < 10 cm (avg. 7.4 cm) broad, typical of the species, turning golden yellow in autumn. In an assessment at U C Davis as part of the National Elm Trial , the tree initially grew comparatively slowly, increasing in height by 0.85 m per annum, although stem development at 2.6 cm d.b.h ...
The bark is grey-brown and deeply furrowed into scaly, flattened ridges. Many older branches have 3–4 irregular thick corky wings. It is for this reason the rock elm is sometimes called the cork elm. [8] The leaves are 5–10 cm (2–4 in) long and 2–5 cm (3 ⁄ 4 –2 in) wide, oval to obovate with a round, symmetrical base and acuminate ...
Zelkova serrata is a medium-sized deciduous tree usually growing to 30 m (98 ft) tall. It is characterized by a short trunk dividing into many upright and erect spreading stems forming a broad, round-topped head. The tree grows rapidly when young though the growth rate slows to medium upon middle age and maturity.