Grapevine trunk diseases are caused by a broad diversity of fungal taxa that have serious impacts on the worldwide viticulture industry due to significant reductions in vineyards yield and lifespan. Field surveys carried out from 2018 to 2022 in California nurseries and young vineyards revealed a high incidence of . Since species are important pathogens of other perennial crops, the present study aimed to identify and determine the pathogenicity of the species on grapevines. Morphology of the fungal colonies coupled with multilocus phylogenetic analyses using nucleotide sequences of the translation elongation factor 1-alpha () and the RNA polymerase II second largest subunit () genes revealed the occurrence of 10 species clustering in six species complexes, namely (FFSC), (FOSC), (FSSC), (FSAMSC), (FIESC), and (FTSC) species complexes. The species (FFSC) was the most prevalent in samples from both symptomatic young vineyards (73.5% incidence) and nursery propagation material (62.5% incidence). Pathogenicity of the 10 most frequent species was confirmed by fulfilling Koch's postulates on living woody tissue of 1103 Paulsen rootstocks. Our results suggest that spp. are involved in the development of young vine decline, probably as opportunistic pathogens when grapevines are under stress conditions.
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