Vol. 63 No. 2 (2024)
Articles

Identification and fungicide screening of Phyllosticta capitalensis causing leaf spot on sweet viburnum in China

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  • Wen LI,
  • Yixuan RUAN,
  • Zhengping BIAN,
  • Yueqiu HE,
  • Kai FENG,
  • Liang LIU,
  • Zhilong WANG,
  • Feng HUANG
Wen LI
Ningbo City College of Vocational Technology, Ningbo Zhejiang
Yixuan RUAN
Ningbo City College of Vocational Technology, Ningbo Zhejiang
Zhengping BIAN
Ningbo Forest Farm, Ningbo Zhejiang
Yueqiu HE
Ningbo City College of Vocational Technology, Ningbo Zhejiang
Kai FENG
Ningbo City College of Vocational Technology, Ningbo Zhejiang
Liang LIU
Ningbo City College of Vocational Technology, Ningbo Zhejiang
Zhilong WANG
Ningbo City College of Vocational Technology, Ningbo Zhejiang
Feng HUANG
Plant Protection Research Institute, Guangdong Academy of Agricultural Sciences, Key Laboratory of Green Prevention and Control on Fruits and Vegetables in South China Ministry of Agriculture and Rural Affairs, Guangdong Provincial Key Laboratory of High, Guangzhou, Guangdong
DOI: https://doi.org/10.36253/phyto-15455
Categories

Published 2024-09-16

Keywords

  • Chemical control,
  • new disease,
  • pathogen identification,
  • phylogeny

How to Cite

[1]
W. LI, “Identification and fungicide screening of Phyllosticta capitalensis causing leaf spot on sweet viburnum in China”, Phytopathol. Mediterr., vol. 63, no. 2, pp. 295–301, Sep. 2024.

Copyright (c) 2024 Wen LI, Yixuan RUAN, Zhengping BIAN, Yueqiu HE, Kai FENG, Liang LIU, Zhilong WANG, Feng HUANG

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

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Abstract

Sweet viburnum (Viburnum odoratissimum Ker-Gawl.) is a widely used ornamental plant, which has dense branches and leaves, and fast spreading and evergreen habit. In October 2022, leaf spot symptoms were observed in a hedge of sweet viburnum in Yuanshi Garden, Ningbo, China. Fungi were isolated from symptomatic leaves, and were identified using morphological characteristics and phylogenetic analyses of partial sequences of internal transcribed spacer (ITS), actin (act), and translation elongation factor 1-alpha (tef1-α), and were evaluated in pathogenicity tests. The causal agent of sweet viburnum leaf spot was identified to be Phyllosticta capitalensis. Effects of seven fungicides on P. capitalensis were assessed in vitro. Fungicide EC50s (mg L-1) against P. capitalensis were: 270.77 for 75% chlorothalonil (WP); 0.02 for 250 g L-1 azoxystrobin SC; 0.27 for 10% difenconazole WDG; 0.02 for 75% trifloxystrobin + tebuconazole WDG, 9.03 for 35% fluopyram + tebuconazole SC, 5.90 for 500 g L-1 fluazinam SC, and 89.11 for 10% prothioconazole SC. Among these, azoxystrobin SC and trifloxystrobin + tebuconazole WDG could be used for control of viburnum leaf spot. This is the first report of P. capitalensis causing leaf spot of sweet viburnum, and this study provides guidance for chemical management sweet viburnum leaf spot, and on other host plants.

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