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Ulmus pumila, the Siberian elm, is a tree native to Asia.It is also known as the Asiatic elm and dwarf elm, but sometimes miscalled the 'Chinese elm' (Ulmus parvifolia). U. pumila has been widely cultivated throughout Asia, North America, Argentina, and southern Europe, becoming naturalized in many places, notably across much of the United States.
Invasive insects and pathogens are a serious threat to many forests in the United States and have decimated populations of several tree species, including American chestnut, American elm, eastern hemlock, whitebark pine, and the native ash species (see extended listing below). The loss of these tree species is typically rapid with both short ...
A small tree, to 30 or 40 ft tall, with upright, spreading branches, the broad crown developing long, overhanging branchlets when older. [2] The leaves are dark green. [ 1 ] ' Drake' is also distinguished by having a bark that begins exfoliating at a relatively young age.
Ulmus parvifolia, commonly known as the Chinese elm [2] or lacebark elm, is a species native to eastern Asia, including China, India, Japan, Korea, Vietnam, [3] Siberia and Kazakhstan. [4] It has been described as "one of the most splendid elms, having the poise of a graceful Nothofagus ".
Ulmus alata, the winged elm or wahoo, is a small- to medium-sized deciduous tree endemic to the woodlands of the southeastern and south-central United States. The species is tolerant of a wide range of soils, and of ponding, but is the least shade-tolerant of the North American elms.
Furthermore, O. novo-ulmi can also spread from infected trees to healthy trees through root grafts. When the roots of adjacent elm trees come into contact with each other underground, the fungus can move from the infected tree to the healthy tree through these root connections. [2] It can also invade an elm tree through wounds on the bark or ...
Trials with the American elm have been successful; in a six-year experiment with the American elm in Denver, CO, annual Dutch elm disease losses declined significantly after the first year from 7 percent to between 0.4 and 0.6 percent; [48] a greater and more rapid reduction in disease incidence than the accompanying tree sanitation and plant ...
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.