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Control Efficacy of Fungicides on Pepper Bacterial Wilt

고추 풋마름병에 대한 살균제의 방제 효과

  • Lee, Soo Min (Department of Plant Medicine, College of Agriculture, Life and Environment Science, Chungbuk National University) ;
  • Kwak, Yeon Soo (Department of Plant Medicine, College of Agriculture, Life and Environment Science, Chungbuk National University) ;
  • Lee, Kyeong Hee (Environment-Friendly Research Division, Chungbuk Agricultural Research and Extension Services) ;
  • Kim, Heung Tae (Department of Plant Medicine, College of Agriculture, Life and Environment Science, Chungbuk National University)
  • 이수민 (충북대학교 농업생명환경대학 식물의학과) ;
  • 곽연수 (충북대학교 농업생명환경대학 식물의학과) ;
  • 이경희 (충북농업기술원 친환경연구과) ;
  • 김흥태 (충북대학교 농업생명환경대학 식물의학과)
  • Received : 2015.08.25
  • Accepted : 2015.09.18
  • Published : 2015.09.30

Abstract

Control efficacy was investigated with fungicides as 3 copper compound, 3 antibiotic fungicides and one fungicide containing to quinolone against the growth of Ralstonia solanacearum on NA medium and the disease occurrence on pepper seedlings. Among 7 fungicides, oxytetracycline was shown the highest activity against a growth of the pathogen in the agar diffusion method, but validamycin showed no activity against the pathogen. With $1000{\mu}g\;mL^{-1}$ of each copper fungicide as copper hydroxide, copper oxychloride+ dithianone and copper sulfate, 2.2, 1.3 and 1.5 mm in size of clear zone only could be found, respectively. In pepper seedling test, oxytetracycline showed a perfect activity in all treatments 7 days after inoculation. However, its activity was decreased from $500{\mu}g\;mL^{-1}$ of treatment over the time. Copper fungicides showed the control efficacy lower than antibiotic fungicides except for validamycin. Based on the results, it was suggested that it would be better to use antibiotic fungicides than copper fungicides to control pepper bacterial wilt in the fields.

식물세균병 방제에 사용되는 3종의 동 살균제, 3종의 항생물질계 살균제, 그리고 1종의 quinolone계 살균제를 선발하여 풋마름병균인 Ralstonia solanacearum에 대한 생장 억제 효과와 고추 유묘에서의 병 방제 효과를 조사하였다. NA배지 상에서 실시한 생장 억제 실험에서 oxytetracycline은 가장 우수한 효과를 보였는데, $1000{\mu}g\;mL^{-1}$ 처리에서 저지원의 크기가 14.95 mm로 가장 크게 나타났으며 $8.0{\mu}g\;mL^{-1}$ 처리구에서도 0.91 mm 크기의 저지원을 확인할 수 있었다. Validamycin은 병원균 생장에 대한 억제효과가 전혀 없었다. 동 살균제들은 copper hydroxide, copper oxychloride+dithianone, copper sulfate의 $1000{\mu}g\;mL^{-1}$ 처리구에서 각각 2.19, 1.30, 1.48 mm의 저지원이 나타났을 뿐 큰 효과를 보이지 않았다. 유묘 검정을 위해서 토양에 살균제를 관주처리하였을 때, 실내 검정에서 가장 효과가 우수하였던 oxytetracycline이 병원균을 접종하고 7일 후까지 모든 처리 농도에서 시들음 증상이 전혀 관찰되지 않아 100%의 아주 우수한 방제효과를 보였으나, 14일 후에는 $5000{\mu}g\;mL^{-1}$의 처리구에서부터 효과가 감소하였다. 3 종의 동 살균제는 7일 후에 $2000{\mu}g\;mL^{-1}$에서 90%의 효과를 보여 다른 살균제보다 낮은 효과를 보였으며, 14일후에는 copper sulfate를 제외한 2종의 살균제에서는 $500{\mu}g\;mL^{-1}$ 처리구에서 효과가 40% 이하로 감소하였다. 결과적으로 R. solanacearum에 의한 풋마름병의 방제를 위해서는 동 살균제보다는 항생물질계 살균제 또는 quinolone계 살균제 중에서 선발하여 사용하는 것이 타당할 것으로 생각된다.

Keywords

References

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