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<br />How to Identify and Manage Dutch Elm Disease <br /> <br />Page 3 of 16 <br /> <br /> <br />Figure 1. This photo is all too typical of <br />the devastation caused by Dutch ehn <br />disease. Once a tree in a row is infected, <br />the disease can move through connected <br />root systems to kill the entire row. <br />(photo courtesy of USDA Forest Service <br />via Dr. R. Jay Stipes, Virginia <br />Polytechnic Institute and State <br />University) <br /> <br />This guide provides an update for urban foresters and tree care specialists with the latest <br />information and management options available for Dutch elm disease. <br /> <br />Symptoms <br /> <br />DED symptoms are the result of a <br />fungus infecting the vascular (water <br />conducting) system of the tree. <br />Infection by the fungus results in <br />clogging of vascular tissues, <br />preventing water movement to the <br />crown and causing visual symptoms <br />as the tree wilts and dies. <br /> <br />Foliage symptoms: Symptoms of <br />DED begin as wilting ofleaves and <br />proceed to yellowing and browning. <br />The pattern of symptom progression <br />within the crown varies depending <br />on where the fungus is introduced to <br />the tree. If the fungus enters the tree <br /> <br />http://www.na.fs.fed.us/spfo/pubs/howtos/ht_dedlht_ded.htm <br /> <br />8/25/2004 <br />