杀菌剂对水稻主要病害病原菌的敏感性测定

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中图分类号 S511;S482.2 文献标识码A 文章编号 1007-7731（2025）15-0064-03

DOI号10.16377/j.cnki.issn1007-7731.2025.15.016

Sensitivity of pathogensto differentfungicidesinmajorricediseases

WANG Bing1LI Min12LI Jinliang1ZHANG Qifeng² WU Yao² ZHANG Yaling² （1Heihe Branch of Heilongjiang Academy of Agricultural Sciences，Heihe 15oo86， China; ²Heilongjiang Bayi Agricultural University，Daqing ， China）

AbstractThe mycelial growth rate method wasused to determine the sensitivityof4majorrice disease（bakanae disease，sheath blight，helminthosporium leaf spot，rice blast）pathogens to6 fungicides （ 20% tricyclazole， 25% （20 kresoxim-methyl， 25% phenamacril， 20% propiconazole， 20% zinc thiazole， 125g/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 （EC 50 ）bothbelow 1mg/L ; the best fungicides for inhibiting rice sesame leaf spot pathogen were 20% propiconazole and 25% kresoxim-methyl，with EC values of 50 0.000 7and O.0O3 5 mg/L，respectively;the fungicides with good inhibitory efects on rice blas fungicide were 25% （20 kresoxim-methyl and 125g/L epoxiconazole，with EC50 of 1.001 1 and 1.8621mg/L ，respectively. Overall，all 6 fungicides had inhibitory effects on rice diseases.The fungicides with better inhibitory effects are 125g/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.

Keywords fungicide; rice diseases;mycelial growth rate; virulence

水稻是重要的粮食作物之一，实际生产中，稻瘟病、胡麻叶斑病、恶苗病和纹枯病等多种病害对其产量和品质的影响较大。（剩余3828字）