Anhui Agricultural Science Bulletin, Volume. 31, Issue 15, 64(2025)
Sensitivity of pathogens to different fungicides in major rice diseases
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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Received: Mar. 20, 2025
Accepted: Aug. 21, 2025
Published Online: Aug. 21, 2025
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