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Resistance to thiabendazole and thiophanate-methyl in canadian isolates ofFusarium sambucinum andHelminthosporium solani

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Abstract

Resistance to both thiabendazole (TBZ) and thiophanate-methyl (TPM) was observed in Canadian isolates ofFusarium sambucinum andHelminthosporium solani recovered from diseased potato tubers. Resistance was not found in isolates ofFusarium avenaceum, Fusarium culmorum, Fusarium equiseti andFusarium solani. A high level of resistance to both TBZ (EC50 180 to ≫500 mg/l) and TPM (EC50 ≫500 mg/l) was observed forH. solani isolates, whereasF. sambucinum exhibited a relatively low level of resistance to TBZ (EC50 34 to 71 mg/l) and a high level of resistance to TPM (growth uninhibited by 2,500 mg/l). The incidence ofF. sambucinum resistant to the benzimidazoles was lower (60%) than that observed forH. solani (95%)

Compendio

En Canadá, se observó resistencia tanto al Tiabendazole como al MetilTiofanato, en aislamientos de Fusarium sambucinum y Helminthosporium solani obtenidos de tubérculos de papa enfermos. No se encontró resistencia en aislamientos de Fusarium avenaceum, Fusarium culmorum, Fusarium equiseti y Fusarium solani. Se observó un alto nivel de resistencia tanto al TBZ (EC50 180 a ≫500 mg/dm3) como al TPM (EC50 ≫500 mg/dm3) para los aislamientos de H. solani, mientras que F. sambucinum mostró un nivel relativamente bajo de resistencia al TBZ (EC50 34 a 71 mg/dm3) y un alto nivel de resistencia al TPM (su crecimiento no fue inhibido por 2 500 mg/dm3). La incidencia de F. sambucinum resistente a los bencimidazoles fue menor (60%) que la observada para H. solani (95%)

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Authors and Affiliations

  1. Agriculture Canada, Lethbridge Research Station, T1J 4B1, Lethbridge, AB, Canada

    L. M. Kawchuk (Research Scientist) & D. R. Lynch (Research Scientist)

  2. Alberta Agriculture, Alberta Special Crops and Horticultural Research Center, Brooks, AB, T1R 1E6, Canada

    J. D. Holley (Plant Pathologist)

  3. Canadian Grain Commission, Grain Research Laboratory, 1404-303 Main Street, R3C 3G8, Winnipeg, MB, Canada

    R. M. Clear (Mycologist)

Authors
  1. L. M. Kawchuk
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  2. J. D. Holley
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  3. D. R. Lynch
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  4. R. M. Clear
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Lethbridge Research Station Contribution No. 3879347

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Kawchuk, L.M., Holley, J.D., Lynch, D.R. et al. Resistance to thiabendazole and thiophanate-methyl in canadian isolates ofFusarium sambucinum andHelminthosporium solani . American Potato Journal 71, 185–192 (1994). https://doi.org/10.1007/BF02849053

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  • DOI: https://doi.org/10.1007/BF02849053

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