Anhui Agricultural Science Bulletin, Volume. 31, Issue 15, 64(2025)

Sensitivity of pathogens to different fungicides in major rice diseases

WANG Bing1, LI Min1,2, LI Jinliang1, ZHANG Qifeng2, WU Yao2, and ZHANG Yaling2
Author Affiliations
  • 1Heihe Branch of Heilongjiang Academy of Agricultural Sciences, Heihe 150086, China
  • 2Heilongjiang Bayi Agricultural University, Daqing 163319, China
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    The mycelial growth rate method was used to determine the sensitivity of 4 major rice disease (bakanae disease, sheath blight, helminthosporium leaf spot, rice blast) pathogens to 6 fungicides (20% tricyclazole, 25% kresoxim-methyl, 25% phenamacril, 20% propiconazole, 20% zinc thiazole, 125 g/L epoxiconazole). The results indicated that 25% kresoxim-methyl and 125 g/L epoxiconazole exhibited strong inhibitory effects against bakanae disease and sheath blight pathogen, with median effective concentration (EC50) both below 1 mg/L; the best fungicides for inhibiting rice sesame leaf spot pathogen were 20% propiconazole and 25% kresoxim-methyl, with EC50 values of 0.000 7 and 0.003 5 mg/L, respectively; the fungicides with good inhibitory effects on rice blas fungicide were 25% kresoxim-methyl and 125g/L epoxiconazole, with EC50 of 1.001 1 and 1.862 1 mg/L, respectively. Overall, all 6 fungicides had inhibitory effects on rice diseases. The fungicides with better inhibitory effects are 125 g/L epoxiconazole and 25% kresoxim-methyl. It is recommended to apply them in a mixed or alternating manner in production to avoid pathogens developing drug resistance.

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    WANG Bing, LI Min, LI Jinliang, ZHANG Qifeng, WU Yao, ZHANG Yaling. Sensitivity of pathogens to different fungicides in major rice diseases[J]. Anhui Agricultural Science Bulletin, 2025, 31(15): 64

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    Paper Information

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    Received: Mar. 20, 2025

    Accepted: Aug. 21, 2025

    Published Online: Aug. 21, 2025

    The Author Email:

    DOI:10.16377/j.cnki.issn1007-7731.2025.15.016

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