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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.
Dutch elm disease (DED) causes wilt and death in all elm species native to Minnesota. An invasive fungal pathogen causes the disease and occurs throughout Minnesota. Elm bark beetles spread the DED fungus when feeding. The DED fungus can spread from tree to tree through root grafts.
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Species Profile: Dutch Elm Disease. Lethal fungal disease of elm trees (particularly American elms (Ulmus americana), which are more susceptible to the disease than other elm species) (Olson et al.)
Jul 29, 2024 · Dutch elm disease, widespread fungoid killer of elms ( Ulmus species) and certain other trees, first described in the Netherlands. Spread by bark beetles, the disease has decimated elm populations throughout much of Europe and North America.
Dutch elm disease is caused by two related species of fungi—Ophiostoma ulmi and the more aggressive of the two, Ophiostoma novo-ulmi, which is responsible for most of the devastation. This fungus attacks the tree’s vascular system, preventing the proper flow of water and nutrients.
Dutch elm disease (DED) is most easily detected during early summer when the leaves on an upper branch curl and turn gray-green or yellow and finally brown. This condition is known as flagging, but a flag alone is not absolute assurance that the tree has DED.
Dutch elm disease is a devastating fungal disease that is spread by elm bark beetles and causes rapid browning, shrivelling and death of Ulmus spp. (elms) and the closely-related Zelkova.
What is Dutch elm disease? Dutch elm disease is caused by the fungus Ophiostoma novo-ulmi which is spread by elm bark beetles. It got its name from the team of Dutch pathologists who carried out research on the diseases in the 1920s.
Dutch Elm Disease is caused by Ophiostoma ulmi or Ophiostoma novo-ulmi fungi and spread by the native and European elm bark beetles1. All elm species are susceptible, though introduced Asiatic elms and resistant varieties are less susceptible2. Signs & Symptoms. − Leaf wilting and premature drop. − Brown streaking in sapwood.
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In the 1930s Dutch elm disease (DED) was accidentally introduced from Europe into the United States. It had a devastating impact on American elm (Ulmus americana) and its relatives in urban and riparian environments.
