Research in Plant Disease 2002;8(4):239-244.
Published online December 30, 2002.
고추에서 분리한 탄저병균의 스테롤 생합성 저해 살균제에 대한 감수성 반응과 포장 적응력
박성우, 김준태, 김재정, 김흥태
Sensitivity of Collectotrichum spp. Isolated from Red-pepper to Sterol Biosynthesis Inhibiting-Fungicides and Their Field Fitness
Seong Woo Park, Joon Tae Kim, Jae Jung Kim, Heung Tae Kim
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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