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Rows of American elm trees south of the Lincoln Memorial Reflecting Pool on the National Mall in Washington, D.C. (November 11, 2006) The disease first appeared on the planted rows of American elm trees (Ulmus americana) on the National Mall in Washington, D.C., during the 1950s and reached a peak in the
Ophiostoma ulmi can reproduce asexually by overwintering in both the bark and upper layers of dead or dying elm wood as mycelia and synnemata. [6] Synnemata produce conidia that are sticky and can be spread by vectors. In Dutch elm disease, the vectors that transmit Ophiostoma ulmi are Scolytid beetles. The conidia stick to the bodies of adult ...
E. lycoperdon grows typically on dead alder branches, logs, and stumps in wet places beside rivers, streams and wetlands; it is also found growing on dead elm, beech, poplar, hawthorn, elder, hornbeam, damson, [9] hazel, [10] and pine trees [11] often after late frosts in spring and in the autumn.
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George Washington's Elm, Washington, D.C. George Washington supposedly had a favorite spot under an elm tree near the United States Capitol Building from which he would watch construction of the building. The elm stood near the Senate wing of the Capitol building until 1948. [48] The Logan Elm stood near Circleville, Ohio.
Dutch elm disease was spread by elm bark beetles, yet the tree mortality was caused by a pathogen. [4] Chestnut blight is a fungus spread through wind dispersal and rain splatter; the blight traveled up to 50 miles in a year by natural means. [5] Insect pests, once they reach the adult phase, have the ability to disperse by flight.
Hypsizygus ulmarius, also known as the elm oyster mushroom, [1] and less commonly as the elm leech, [2] elm Pleurotus, is an edible fungus. It has often been confused with oyster mushrooms in the Pleurotus genus but can be differentiated easily as the gills are either not decurrent or not deeply decurrent. [ 3 ]
The American Elm cultivar Ulmus americana 'Jefferson' was cloned from a tree growing near a path in front of the Freer Gallery of Art, close to the Smithsonian Institution Building ("The Castle") on the National Mall in Washington, D.C. [1] The United States National Park Service, which had planted the tree during the 1930s, cloned it in 1993 after screening tests showed that it possessed an ...