<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">T. Jung</style></author><author><style face="normal" font="default" size="100%">Cooke, D. E. L.</style></author><author><style face="normal" font="default" size="100%">Blaschke, H.</style></author><author><style face="normal" font="default" size="100%">Duncan, J. M.</style></author><author><style face="normal" font="default" size="100%">W. Oßwald</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Phytophthora quercina sp. nov., causing root rot of European oaks</style></title><secondary-title><style face="normal" font="default" size="100%">Mycological Research</style></secondary-title><short-title><style face="normal" font="default" size="100%">Mycological Research</style></short-title></titles><dates><year><style  face="normal" font="default" size="100%">1999</style></year><pub-dates><date><style  face="normal" font="default" size="100%">7/1999</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://www.sciencedirect.com/science/article/pii/S0953756208606115</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">103</style></volume><pages><style face="normal" font="default" size="100%">785 - 798</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;In a 3 year study of oak (&lt;em&gt;Quercus robur&lt;/em&gt;, &lt;em&gt;Q. petraea&lt;/em&gt;, &lt;em&gt;Q. cerris&lt;/em&gt;, &lt;em&gt;Q. pubescens&lt;/em&gt; and &lt;em&gt;Q. ilex&lt;/em&gt;) decline in Central and Southern Europe, a papillate homothallic &lt;em&gt;Phytophthora&lt;/em&gt; species was isolated consistently, with other &lt;em&gt;Phytophthora&lt;/em&gt; spp., from necrotic fine roots by direct plating on to selective agar medium and from rhizosphere soil samples by baiting with leaves of &lt;em&gt;Quercus robur&lt;/em&gt;. The morphology, physiology, RAPD banding patterns and pathogenicity against apple fruits of this &lt;em&gt;Phytophthora&lt;/em&gt; sp. are described and compared with those of other papillate &lt;em&gt;Phytophthora&lt;/em&gt; species from Waterhouse's Group I, namely &lt;em&gt;P. cactorum, P. clandestina, P. idaei, P. iranica, P. pseudotsugae&lt;/em&gt; and &lt;em&gt;P. tentaculata&lt;/em&gt;, and papillate Group III &lt;em&gt;P. citricola&lt;/em&gt;. The papillate &lt;em&gt;Phytophthora&lt;/em&gt; isolates from oak differed from all other Group I species by their uniform, dome-shaped and cottonwool-like colony growth pattern on V8 juice agar and malt extract agar, the frequent occurrence of sympodially branched primary hyphae, a high proportion of elongated, ellipsoid or ovoid oogonia, the absence of amphigynous antheridia and RAPD banding patterns. Additionally, there was no other species in Group I with as much variation in size and shape of the sporangia or large proportion of sporangia with a curved apex, hyphal projections, lateral displacement of the papilla and lateral attachment to the sporangiophore. In pathogenicity tests with infested soil, the isolates proved to be more pathogenic to &lt;em&gt;Q. robur&lt;/em&gt; than any other &lt;em&gt;Phytophthora&lt;/em&gt; sp. recovered from declining oaks in Central Europe. Based on their unique combination of cultural, sporangial and gametangial morphology, pathogenicity and close association with &lt;em&gt;Quercus&lt;/em&gt; but not other trees, the papillate &lt;em&gt;Phytophthora&lt;/em&gt; isolates from oak are described as &lt;em&gt;Phytophthora quercina&lt;/em&gt; sp. nov.&lt;/p&gt;</style></abstract><issue><style face="normal" font="default" size="100%">7</style></issue></record></records></xml>