Abstract
Bougainvillea spectabilis is an ornamental shrubby vine widely distributed in tropical and subtropical regions of China. In September 2020, a leaf spot of B. spectabilis was observed on Yongxing Island of Sansha City, Hainan Province. At a disease incidence of >30%, this leaf spot seriously reduced the ornamental value of affected plants. The typical symptoms included lesions consisting of circular or subcircular, gray pale centers with dark brown borders surrounded by diffused yellow margins. Fungal cultures isolated from colonies growing from surface-sterilized leaf tissues on potato dextrose agar exhibited similar morphological characteristics. The fungus was identified as Nigrospora lacticolonia based on its morphological characteristics and phylogenetic analysis using the internal transcribed spacer (ITS) region of rDNA, β-tubulin (TUB2) and translation elongation factor 1-alpha (TEF1-α) gene sequences. Pathogenicity tests showed that the fungus could infect B. spectabilis, and it was successfully re-isolated from inoculated leaf tissues, fulfilling Koch’s postulates. This is the first report of N. lacticolonia causing leaf spot on B. spectabilis.
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