What question did this study set out to answer?

To identify the causal agent of leaf spot symptoms in Bletilla striata in China.

January 14, 2026Journal of Phytopathology0 citations

First Report of Colletotrichum cymbidiicola Causing Leaf Spot on Bletilla striata in China

YQYanqiu QinYunnan University XZXiaoshan ZhouYunnan Agricultural University XWXiaojuan WeiYunnan Agricultural University

Key Points

To identify the causal agent of leaf spot symptoms in Bletilla striata in China.
Morphological characterisation was performed.
Multilocus phylogenetic analysis was conducted using ITS, ACT, TUB, and GAPDH gene regions.
Koch's postulates were applied to confirm the causal agent.
Bletilla striata showed severe anthracnose symptoms.
Symptoms included brown necrotic lesions and elliptical or fusiform spots.
C. cymbidiicola was confirmed as the etiological agent.

Abstract

ABSTRACT Bai‐ji ( Bletilla striata ), an economically important medicinal herb cultivated in Yunnan Province, China, was observed with severe anthracnose symptoms in July 2021. Through comprehensive morphological characterisation and multilocus phylogenetic analysis ( ITS , ACT , TUB , and GAPDH gene regions), the causal agent was identified as Colletotrichum cymbidiicola . Initial symptoms manifested as brown necrotic lesions that progressively developed into elliptical or fusiform spots with light brown centers. Koch's postulates confirmed that C. cymbidiicola was the etiological agent. This study is the first documented case of C. cymbidiicola infecting B. striata in China, providing valuable phytopathological insights for the sustainable cultivation of this medicinal species.

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