Research in Plant Disease (식물병연구)

The Korean Society of Plant Pathology (한국식물병리학회)
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Research to Fungicide Sensitivity of Colletotrichum spp. Isolated from Apple Fruits in Cheongsong, Korea

사과 주 재배지 경북 청송 지역 사과 탄저병원균의 살균제에 대한 감수성 조사

  • Jungyeon Kim (Department of Plant Medicals, Andong National University) ;
  • Heung Tae Kim (Department of Plant Medicine, College of Agriculture, Life & Enviromen Sciences, Chungbuk National University) ;
  • Yongho Jeon (Department of Plant Medicals, Andong National University)
  • 김중연 (안동대학교 생명과학대학 식물의학과) ;
  • 김흥태 (충북대학교 농업생명환경대학 식물의학과) ;
  • 전용호 (안동대학교 생명과학대학 식물의학과)
  • Received : 2023.03.02
  • Accepted : 2023.04.19
  • Published : 2023.06.30
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Abstract

Apple grower in the Cheongsong region, Korea has reported the increased loss of apple yield due to severe bitter rot incidence. We noticed that this indience is because the Colletotrichum population has developed resistance to commonly used fungicides. We isolated 39 Colletotrichum isolates from 13 orchards in Cheongsong, and all the isolated Colletotrichum species were identified as C. siamense or C. fructicola. These 39 strains were tested for mycelial growth and conidial germination against 12 fungicides. trifloxystrobin (30-55% in recommended concentrations) was shown lower inhibitory effect on mycelial growth. However, the inhibition of conidial germination was shown higher than mycelial growth (62-100%). Kresoxim-methyl was shown lower inhibitory effect on mycelial growth (29-55%). conidial germination inhibitory effect was shown 51% to 96%. dithianon was shown diversity response to inhibition of mycelial growth (43-100%). Tebuconazole was shown high inhibitory effect on mycelial growth (84-100%) and conidial germination inhibitory effect was shown to be 64 to 100%. metconazole has been found to display with high inhibitory effect on mycelial growth (79-100%) and conidial germination (70-80%). fluazinam was shown to possess high inhibitory effect on mycelial growth (87-100%) and conidial germination (94-100%). This study provides basic information for the effective management of apple bitter rot.

2018년, 경상북도 청송군 소재 7개의 읍면리의 13개 사과과원에서 채집한 탄저병 감염 과실로부터 39개 탄저병 균주를 분리한 후 이 균주들을 대상으로 국내에 등록된 12개의 사과 탄저병 살균제에 대한 균자생장 억제, 포자발아 억제율을 조사하여 각각의 살균제에 대한 감수성 정도를 한천희석법을 이용한 실내검정법으로 조사하였다. 살균제 감수성 실내검정 결과 captan, dithanon, fluazinam, metconazole, tebuconazole에서는 저항성 균주가 나타나지 않았으나, trifloxystrobin, kresoxim-methyl 살균제에서는 모든 지역에서 저항성을 보이는 균주가 관찰되었다. 이를 통해 일부 지역에서 살균제의 지속적인 처리로 인하여 균주 집단 내 살균제 내성이 발현되었음을 알 수 있었다. 저항성이 발현된 strobilurin 계통의 살균제를 관리하기 위하여 연용 살포를 하지 말아야 하며, 살포기간에 유용미생물로 인한 대체 살포 등 관리가 필요하다.

Keywords

Acknowledgement

This work was supported by Korea Institute of Planning and Evaluation for Technology in Food, Agriculture, Forestry (IPET) through Crop Viruses and Pests Response Industry Technology Development Program, funded by Ministry of Agriculture, Food and Rural Affairs (MAFRA)(320042-5).

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