Mating Type and Effective Control of <i>Phytophthora colocasiae</i> in Fujian

WANG Rongbo; SHI Mingyue; XU Yuehua; LIU Peiqing; BIAN Runtian; WENG Qiyong; LI Benjin

doi:10.19303/j.issn.1008-0384.2024.07.008

Volume 39 Issue 7

Jul. 2024

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WANG R B, SHI M Y, XU Y H, et al. Mating Type and Effective Control of Phytophthora colocasiae in Fujian [J]. Fujian Journal of Agricultural Sciences，2024，39（7）：810−818 doi: 10.19303/j.issn.1008-0384.2024.07.008

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WANG R B, SHI M Y, XU Y H, et al. Mating Type and Effective Control of Phytophthora colocasiae in Fujian [J]. Fujian Journal of Agricultural Sciences，2024，39（7）：810−818 doi: 10.19303/j.issn.1008-0384.2024.07.008

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Mating Type and Effective Control of Phytophthora colocasiae in Fujian

doi: 10.19303/j.issn.1008-0384.2024.07.008

WANG Rongbo^{1, 2
,},
SHI Mingyue^{1, 2},
XU Yuehua³,
LIU Peiqing^{1, 2},
BIAN Runtian^{1, 2},
WENG Qiyong^{1, 2
,
,},
LI Benjin^{1, 2
,
,}

1.
Institute of Plant Protection, Fujian Academy of Agricultural Sciences/Fujian Key Laboratory for Monitoring and Integrated Management of Crop Pests/Fujian Engineering Research Center for Green Pest Management, Fuzhou, Fujian　350013, China
2.
College of Plant Protection, Fujian Agriculture and Forestry University/Ministerial and Provincial Joint Innovation Centre for Safety Production of Cross-Strait Crops, Fuzhou, Fujian　350002, China
3.
Yongding Plant Protection and Inspection Station of Longyan City, Longyan, Fujian　364100, China

Received Date: 2024-04-02
Rev Recd Date: 2024-05-13

Available Online: 2024-08-15

Publish Date: 2024-07-28

Abstract

Abstract

Objective Mating type and fungicides for effective control of Phytophthora colocasiae that caused 2020 taro blight epidemic in Fujian were determined. Method Specimens of diseased taro tissues were collect from the 4 blight-infected regions in Fujian to isolate and identify the pathogen. Based on the morphology, pathogenicity, and sequence homology of ITS-LSU-Ypt1, the pathogenic strains were identified to be of P. colocasiae. Subsequently, mating type and sensitivity to 6 fungicides of the isolates were determined in the laboratory. Result In total, 125 strains were isolated and identified to have caused the epidemic. Out of them, 122 belonged to the A2 mating type and 3 the A1A2 type. The laboratory toxicity test of 6 fungicides on the isolates showed 98% metalaxyl to be the strongest with EC₅₀ of (0.146±0.032) μg·mL⁻¹, while the EC₅₀ of 95% dimethomorph, 98% fluopicolide, and 94% cyazofamid ranged from (0.239±0.011) μg·mL⁻¹ to (0.713±0.088) μg·mL⁻¹ and that of 95% azoxystrobin at (23.447±3.666) μg·mL⁻¹. Conclusion The dominant strains of P. colocasiae that caused the taro blight in Fujian in 2020 were of the A2 mating type and could be best controlled by using 98% metalaxyl, 95% dimethomorph, 98% fluopicolide, or 94% cyazofamid.
- Phytophthora colocasiae,
- pathogen identification,
- mating type,
- fungicides

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References(27)

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