Isolated from Grapevine Is a Mycoparasite of .

The best known spp. are important pathogens of small-grain cereals and/or endophytes of diverse monocot hosts. This study is the first report of isolated from asymptomatic grapevine tissues. It was hypothesised that this strain, CBS 152328, was an endophyte and an antagonist of some fungal pathogens of grapevine. Microscopic examinations revealed that this strain was a necrotrophic mycoparasite of . This was demonstrated in the confrontation zones of dual cultures of and , and also on the surface of co-inoculated grape leaf discs and germinated wheat grains. Pathogenicity tests indicated that can colonise both grape leaf discs and germinated wheat, but it only damaged wheat. When co-inoculated with onto grape leaf discs, the strain CBS 152328 suppressed its mycohost on grape tissues and prevented leaf necrosis caused by . In addition to the parasitism, also showed mild antibiosis against , as well as a defence elicitor effect on grape leaf discs. This work is the first report of the mycoparasitic behaviour of , in addition to its first isolation from a dicot host.