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http://dx.doi.org/10.5423/RPD.2006.12.1.032

Response to Fungicides of Colletotrichum Species Isolated from Infected Tissues of Several Crops  

Kim Joon-Tae (Department of Plant Medicine, College ol Agriculture, Life and Environment Sciences, Chungbuk National University)
Min Ji-Young (Department of Plant Medicine, College ol Agriculture, Life and Environment Sciences, Chungbuk National University)
Kim Heung-Tae (Department of Plant Medicine, College ol Agriculture, Life and Environment Sciences, Chungbuk National University)
Publication Information
Research in Plant Disease / v.12, no.1, 2006 , pp. 32-39 More about this Journal
Abstract
This study has been conducted to investigate the responses of various isolates of four Colletotrichum species such as C. gloeosporioides, C acutatum, C. coccodes, and C. dematium isolated from infected tissues of several crops to fungicides such as carbendazim, carbendazim+diethofencarb, four protective fungicides, and three ergosterol biosynthesis-inhibiting (EBI) fungicides. All the isolates of C. acutatum showed $EC_{50}$ values in a range of 0.001-3.040 ${\mu}g/ml$ against carbandazim, a benzimidazole fungicide. As for the response to carbendazim, the isolates of C. gloeosporioides obtained from pepper, apple, and strawberry were clearly divided into two groups, resistant or sensitive isolates. All the resistant isolates showed $EC_{50}$ values above 1000 ${\mu}g/ml$, whereas the sensitive isolates had lower $EC_{50}$ values than 0.550 ${\mu}g/ml$. The isolates of C. gloeosporioides exhibited a negative cross resistance between carbendazim and diethofencarb (a N-phenylcarbamate fungicide), but isolates of C. acutatum did not. Toward carbendazim, C. coccodes and C. dematium isolates showed a similar response to C. acutatum isolates and the sensitive isolates of C. gioeosporioides, respectively. As for response of Protective fungicides, all the isolates of C. acutatum showed a more resistant reaction than all the isolates of C. gloeosporioides. However, there was no difference among 4 species of Colletotrichum against EBI fungicides.
Keywords
Benzimidazole; Colletotrichum; Ergosterol biosynthesis-inhibiting fungicide; Fungicidal reaction; Protective fungicide;
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