We have isolated and confirmed the identification of ash dieback fungus (Chalara fraxinea, teleomorph Hymenoscyphus albidus) for the first time in Finland. In a preliminary analysis, considerable amount of genetic variation was detected among 20 Finnish (Åland and mainland Finland), one Latvian and 11 Estonian isolates, analysed by random amplified microsatellite (RAMS) markers.
Uni-and binucleate Rhizoetonia and Pythiaceae fungi were isolated from roots of dieback seedlings. Only binucleate Rhizoetonia strains were present in the roots of healthy seedlings. In pathogenicity tests, uninucleate Rhizoetonia sp. were pathogenic and binucleate Rhizoetonia spp. non-pathogenic. Pythium uitimum var. ultimum and Phytophthora undulata were the only Pythiaceae fungi that killed 12-week-old seedlings.
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