Sensitivity of Venturia nashicola isolated from pear [Pyrus pyrifolia] orchards in Chiba prefecture [Japan] to DMI fungicides
2006
Ohtani, T.(Chiba-ken. Agriculture Research Center (Japan)) | Shiota, A. | Hirano, K.
Sensitivity of field strains of Venturia nashicola isolated from Japanese pear orchards in Chiba prefecture to sterol demethylation inhibitor (DMI) was examined in 2004. Mean EC50 value of fenarimol for 132 strains from 7 fields of 3 regions was 0.53 mg/l, and mean EC50 value of hexaconazole for 71 strains from 3 fields of 1 region was 0.057 mg/l. These values were higher as compared to the values of baseline sensitivity. However, the degree of reduced sensitivity was slight; thus, it seemed that the efficacy of DMI fungicides on V. nashicola in orchards was still sufficient to control the disease.
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