Identification and fungicide sensitivity of Alternaria tenuissima causing leaf spot of Tetrapanax papyrifer newly reported in China

Tetrapanax papyrifer, the rice‐paper plant, is an evergreen shrub and is traditionally used as a herbal medicine in China. In October 2021, a serious leaf spot disease was extensively observed on T. papyrifer in Guizhou, China. Given the limited information available about the aetiology of this dise...

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Bibliographic Details
Published in:Journal of phytopathology 2024-01, Vol.172 (1), p.n/a
Main Authors: Tang, Xian‐Ying, Ban, Rui, Wu, Xue‐Ping, Li, Hong‐Tao, Javed, Khadija, Peng, Li‐Juan, Ding, Hai‐Xia
Format: Article
Language:English
Subjects:
Alternaria tenuissima
Chemical control
China
Difenoconazole
etiology
fungi
Fungicides
Herbal medicine
herbal medicines
leaf spot
Leafspot
Leaves
Pathogenicity
Pathogens
Phylogeny
Physical characteristics
plant pathology
rice‐paper plant
shrubs
Tetrapanax papyrifer
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Summary:Tetrapanax papyrifer, the rice‐paper plant, is an evergreen shrub and is traditionally used as a herbal medicine in China. In October 2021, a serious leaf spot disease was extensively observed on T. papyrifer in Guizhou, China. Given the limited information available about the aetiology of this disease, isolations were performed, the morphological characteristics and multi‐locus phylogenetic analysis of the fungus associated with the disease were described, and the pathogenicity tests and Koch's postulates were completed. To our knowledge, this is the first report of leaf spot on T. papyrifer caused by Alternaria tenuissima in China. Among 11 fungicides tested, 10% difenoconazole WDG had the best inhibition effect in vitro with EC50 values at 0.1 μg mL−1. This study provides new information for the identification and chemical control of Alternaria leaf spot of T. papyrifer.
ISSN:0931-1785
1439-0434
DOI:10.1111/jph.13244