Abstract
Fungal assemblages present in necrotic tissues of Quercus robur were determined at two sites in Switzerland. Fungi were identified by examination of fruitbodies or by isolation. Assemblages differed with location (stem or twig), tissue source (xylem or bark), method of detection (isolation or inspection), stage of damage, and between sites. Dominant fungi in stem lesions were Amphiporthe leiphaemia, Pezicula cinnamomea, Phomopsis quercella, Fusarium sp., and Dichomera saubinetii. In diseased twig tissues A. leiphaemia and Colpoma quercinum, Fusarium sp., and P. cinnamomea were the most common. It is suggested that the lesions were induced by drought followed by a high frost incidence but that fungi may have been contributory.
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