However, almost all mature American elm trees have been killed in the last 50 years by Dutch elm disease, which is caused by a fungus, Ophiostoma novo-ulmi , introduced from Asia. Carried by bark beetles The native elm bark beetle Hylurgopinus rufipes , the smaller European elm bark beetle Scolytus multistriatus and the banded elm bark beetle S. Fungicides to treat the condition are costly and only extend the tree's life for a maximum of a decade. Samples should be sent to a diagnostic laboratory as soon as DED is suspected. Knowing the dangers elm trees face is the first step to preventing them! Therefore new infections are seen at small twigs.
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Fielding Tree & Shrub Care

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Dutch Elm Disease

The disease is caused by the invasive fungal pathogen, Ophiostoma novo-ulmi , and occurs throughout Minnesota. For this reason, elm pruning is banned in Manitoba from April 1 to July Mature American elms can be injected with fungicides to prevent infection, and beetle populations can be reduced with chemical sprays. Their graceful vase shape and wide canopy made them especially popular for lining city streets. Fungicide injections can protect elm trees from infection by bark beetles. The beetles tunnel under the bark to lay their eggs. In susceptible trees, the fungus is often capable of reaching the root system within the first season in which it is infected.
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Environmental Information Series

Both of these methods are expensive and labor-intense, and insecticides can have harmful effects on other organisms including humans. The disease usually does not spread in this manner beneath roads because the road foundation prevents root grafts between trees on opposite sides. Always use sanitized pruning tools when pruning so you do not transfer disease to healthy trees. The City of Winnipeg recommends chipping the wood into mulch or taking the wood to Brady Landfill. Choose Dutch elm disease resistant cultivars for new plantings or as replacement trees. Information about Dutch elm disease Ophiostoma ulmi and Ophiostoma novo-ulmi , forest vascular diseases found in Ontario. Though they have resistance to Dutch elm disease, Chinese elms may still become stricken by it.
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Movement within the tree Once in the trees' vascular system, the fungal spores are carried up the tree with the flow of water. Elm tree injections are an option for those who wish to protect healthy, high-value elm trees on their property. These persistent elms are tough to destroy! The Siberian elm has naturalized and is now considered a noxious weed or invasive species in 41 states. This beautiful giant produces bright green leaves and flowers during April and May.
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Asian elm tree diseases

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