01284nas a2200169   4500008004100000024003200041245012900073210006900202260010900271300001000380520058500390100001600975700001700991700001601008700001701024856007301041       2007                        eng d  aGen. Tech. Rep. PSW-GTR-22100aProceedings of the fourth meeting of the International Union of Forest Research Organizations (IUFRO) Working Party 07.02.090 aProceedings of the fourth meeting of the International Union of   aMonterey, CaliforniabU.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station  a334 p3 a<p>The fourth meeting of the International Union of Forest Research Organizations (IUFRO) Working Party S07.02.09, Phytophthoras in Forests and Natural Ecosystems provided a forum for current research on <em>Phytophthora</em> species worldwide. Seventy-eight submissions describing papers and posters on recent developments in <em>Phytophthora</em> diseases of trees and natural ecosystems in Europe, Australasia, and the Americas are included. Research topics covered are <em>Phytophthora</em> biodiversity, ecology, epidemiology, management, and host- pathogen interactions.</p>1 aGoheen, E M1 aFrankel, S J1 aGoheen, E M1 aFrankel, S J  uhttp://www.iufro.org/science/divisions/division-7/70000/70200/70209/02226nas a2200181   4500008004100000245006200041210006200103260001200165490000700177520171000184100001601894700001601910700001601926700002001942700001801962700001401980856005001994       2002                        eng d00aSudden oak death caused by Phytophthora ramorum in Oregon0 aSudden oak death caused by Phytophthora ramorum in Oregon  c04/20020 v863 a<p>Sudden oak death, caused by <em>Phytophthora ramorum</em> (1,2), has been found for the first time in Oregon, killing tanoak, <em>Lithocarpus densiflorus</em>, trees. To our knowledge, this is the first report of the disease outside of the San Francisco to Monterey area in California, (300 km to the south). Nine areas of infestation, all within a 24-km<sup>2</sup> area, were discovered on forest lands near Brookings, in southwest Oregon. Mortality centers ranged in size from 0.2 to 4.5 ha and included 5 to approximately 40 diseased trees. <em>P. ramorum</em> was isolated from stem cankers using <em>Phytophthora</em>-selective medium. Isolates had distinctive morphological features characteristic of <em>P. ramorum</em>, including abundant production of chlamydospores and caducous, semipapillate sporangia on solid media. Internal transcribed spacer (ITS) sequences of isolates of <em>P. ramorum</em> from Oregon were identical to ITS sequences of isolates from California (1). The pathogen also was isolated from necrotic lesions on leaves and stems of native <em>Rhododendron macrophyllum</em> and <em>Vaccinium ovatum</em> growing beneath diseased tanoaks. In July 2001, the disease was located by an aerial survey conducted cooperatively by the USDA Forest Service and Oregon Department of Forestry. All lands within 1.6 km (1 mile) of the mortality centers are subject to Oregon quarantine, which bars the transport of any host plant materials. An eradication effort is currently underway. Symptomatic plants and all known host plants within 15 to 30 m of symptomatic plants are being cut and burned in the first phase of this operation. The total treated area is approximately 16 ha.</p>1 aGoheen, E M1 aHansen, E M1 aKanaskie, A1 aMcWilliams, M G1 aOsterbauer, N1 aSutton, W  uhttp://dx.doi.org/10.1094/PDIS.2002.86.4.441C