| 고추에서 분리한 탄저병균의 스테롤 생합성 저해 살균제에 대한 감수성 반응과 포장 적응력 |
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박성우, 김준태, 김재정, 김흥태 |
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| Sensitivity of Collectotrichum spp. Isolated from Red-pepper to Sterol Biosynthesis Inhibiting-Fungicides and Their Field Fitness |
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Seong Woo Park, Joon Tae Kim, Jae Jung Kim, Heung Tae Kim |
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| Abstract |
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Among 34 isolates of Colletotrichum spp., 20 from red pepper and 14 from apple, only one isolate 2001-45 was identified as the isolate resistant to sterol biosynthesis inhibiting fungicides. EC50 values of the isolate 2001-45 were 153.5, 42.7, 34.0, and 17.1 μg/ml for myclobutanil, tebuconazole, hexaconazole and nuarimol, respectively. The resistance factor of the isolate 2001-45 against the other isolate 2001-44 to 4 above fungicides was ranged from 17 to 57. However, EC50 value of the 2001-45 for prochloraz was 0.07 μg/ml, which was lower than those of the 2001-44 and the isolate JC24. For the fitness test of the 2001-45, mycelial growth, sporulation on PDA and pathogenicity on fruits were investigated. No difference in mycelial growth was found between 2001-45 and 2001-44, but great difference in sporulation. No symptom was developed by 2001-45 even by wound inoculation of pepper fruit. Therefore, this study indicated that the isolate 2001-45 was inferior to the other isolates in the fitness, although the isolate 2001-45 was highly resistant to sterol biosynthesis inhibiting fungicides. |
| Key Words:
fungicide resistance, sterol biosynthesis inhibiting fungicides, Colletotrichum sp. field fitness |
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