Fungi were isolated in pure cultures from decaying giant sequoias Geneva (Switzerland). Isolates genetically identified by ITS rDNA sequencing. Young sequoia trees artificially infected with a culture of Botryosphaeria parva. Henle-Koch’s Postulates demonstrated that parva was pathogenic to Sequoiadendron giganteum. When analysing the microorganisms associated canker and dieback symptoms (Sequo...