Dutch Elm Disease was first noticed in France in 1918 and identified in Holland in 1922 - hence its name. In the 1980s it killed 90% of England's elms and 50% of Europe's elms.
Dutch Elm Disease is caused by the fungus Ceratocystis Ulmi that is transmitted by two species of bark beetles or by root grafting.
Symptoms: ...
Dutch elm disease is an aggressive disease of American elm trees. The fungus that causes the disease moves from tree to tree via elm bark beetles. As the beetles tunnel in to lay eggs, the fungus enters the plants' water-conducting system.
The Shade Garden was rebuilt in 1987 when Dutch elm disease ravaged the elm trees. They were replaced with maple, ash and linden trees, casting a shady background over undulating brick walks edged with primula to create a cool area on a hot sunny day.
Q: Have other American elms been tested against Dutch elm disease?
A: Yes. In the early 1990s, the US National Arboretum in Washington, DC, tested several American elm selections.
Dutch Elm Disease-Resistant Elm Cultivars
Fire Blight
Flood Stress on Trees
Fungus-Killed Flies
Hiring an Arborist
Honeysuckle Leaf Blight
Honeysuckle Witches' Broom Aphid
Hypoxylon Canker on Aspens and Willows
Lace Bugs ...
Diecious, this tree has both male and female varieties. Since the onset of Dutch elm disease, Green Ash has been over-planted in urban and conservation settings as a replacement for the American Elm.
This apparent trend of decreasing disease severity in one region is puzzling and inconsistent with other introduced diseases in North American forest trees, most notably chestnut blight and Dutch elm disease.
The level of threat has been compared to that of Dutch elm disease and chestnut blight, the agents of forest death in the 20th century.
It is commonly placed as a shade tree in home landscapes and is also popular along streets and in parking lot islands. The Chinese Elm is resistant to Dutch Elm Disease. It thrives in USDA Hardiness Zones 7b through 10b.
The portion of the life cycle occurring on elm has become more doubtful and less important than in the past, since most elms have disappeared from Eastern forests because of Dutch Elm Disease.
Prize Picks: Green Vase's shape is true to form with fast-growing, upward arching branches whose leaves turn orange-brown to bronze-red in fall. Village Green is also fast-growing with warm fall color, also resistant to Dutch elm disease.
Meanwhile, other pathogens that have been causing devastation for decades, like those responsible for Dutch elm disease and chestnut blight, have steadily spread westward to infect trees in new territories.
 See also: Plant, Leaf, Branch, Native, Water
  
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