Sensitivity of Diplocarpon mali, the causal fungus of apple blotch, to the strobilurin fungicide kresoxim-methyl was evaluated based on minimum inhibitory concentrations (MIC) against mycelial growth in vitro. MIC values for 195 monoconidial isolates collected from two and one untreated abandoned orchards in Iwate Prefecture in 2006 and 2008, respectively, ranged from 0.05 to 0.25ppm, which is considered to be the baseline sensitivity of D. mali. Monitoring of 1,406 monoconidial isolates collected from 17 commercial orchards in Iwate Prefecture from 2006 to 2008 revealed MIC values ranging from 0.01 to 0.25ppm, which is similar to the baseline sensitivity. This result showed that no resistant isolate was detected and that sensitivity to kresoxim-methyl was remained after use of strobilurin fungicide in commercial orchards.
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リンゴ褐斑病菌のストロビルリン系殺菌剤クレソキシムメチルに対する感受性
tarc_report_No111p85-88p.pdf
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