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08!10/88 MON 12:58 FAX 503 986 4786 ODA PLANT DIV, 0 002 0 >., Departm of Agriculture , e ': ,, O regon Mailing address: +" ; , -: 635 Capitol Street NE ".�: John A. KiFzheUeq M.A.. Governor Salem, OR 97310 -0110 Location address: August 10, 1998 3420 Cherry Ave NE Mil„ (i \ Mike Bellmore /Jeff Anderson Department of Urban Forestry Public Works Maintenance City of Eugene 1820 Roosevelt Eugene OR 97402 SUBJECT: Occurrence of Dutch Elm Disease in Eugene The occurrence of Dutch elm disease (DED) caused by the fungus, , Ophiostoma ulmi, (= Ceratocystis ulmi), in elm trees requires prompt attention when it is found to remove the infected trees. Since the 1986 outbreak of DED in Eugene and Portland, there have been annual surveys by cities such as Portland, Hillsboro, and Corvallis to identify infected trees, and they have promptly removed them to eliminate the source of inoculum for the elm bark beetle to carry to other trees. If the infected trees are not removed, they serve as a source of inoculum for additional spread into the urban forest. There is also the possibility of adjacent trees becoming infected by underground root grafts between trees. When the last outbreak of DED occurred in Eugene, the prompt action by the Eugene City Council was important. The passage of the resolution supporting the efforts of the Department of Public Works was critical to reduce any additional spread. The 12 -year gap before the next outbreak of DED is encouraging. The City of Portland has had an active DED survey program carried out by the Department of Urban Forestry e e slowing e the spread disease remove the infected elm trees has successful in The City of Corvallis and Benton County have also had an active program to remove individual or clusters of DED infected elms. They also feel this proactive approach has been the correct approach.