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Resistance to thiabendazole and thiophanate-methyl in canadian isolates ofFusarium sambucinum andHelminthosporium solani |
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| Authors: | L M Kawchuk J D Holley D R Lynch R M Clear |
| Institution: | 1. Agriculture Canada, Lethbridge Research Station, T1J 4B1, Lethbridge, AB, Canada 2. Alberta Agriculture, Alberta Special Crops and Horticultural Research Center, Brooks, AB, T1R 1E6, Canada 3. Canadian Grain Commission, Grain Research Laboratory, 1404-303 Main Street, R3C 3G8, Winnipeg, MB, Canada |
| 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%) |
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