First report of "Cylindrocarpon" pauciseptatum associated with black foot disease of grapevine in Brazil.
Since 1999, the decline of American grapevines (Vitis labrusca) has been common in Rio Grande do Sul, Brazil. In August 2012, V. labrusca with black foot symptoms were collected in vineyards in the Serra Gaúcha Region. Symptomatic plants had low vigour, vascular lesions, delayed budding, and decline and death of vines. Symptomatic roots had necrotic lesions and reduced biomass. Based on morphological characteristics, DNA sequence analysis (rDNA-ITS, β-tubulin and histone H3) and pathogenicity tests, the causal agent was identified as "Cylindrocarpon" pauciseptatum. This is thought to be the first report of "C." pauciseptatum associated with black foot disease of grapevine in Brazil, which may potentially impact the sustainability of grapevine nurseries and vineyard productivity.