Journal of Forest and Environmental Science

Institute of Forest Science, kangwon National University (강원대학교 산림과학연구소)
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In vivo Pathogenicity Test of Oak Wilt Fungus (Raffaelea quercus-mongolicae) on Oriental Chestnut Oak (Quercus acutissima)

  • Yi, Su Hee (Tree Pathology and Mycology Lab., College of Forest and Environment Science, Kangwon National University) ;
  • Lee, Jin Heung (Forest Environment Research Institute) ;
  • Seo, Sang Tae (National Institute of Forest Science) ;
  • Lee, Jong Kyu (Tree Pathology and Mycology Lab., College of Forest and Environment Science, Kangwon National University)
  • Received : 2017.09.24
  • Accepted : 2017.11.08
  • Published : 2017.11.30
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Abstract

Since the first report of the oak wilt disease at 2004 in Korea, the disease distributed over Korean peninsula and are still giving severe damages. The management of oak wilt disease in Korea has mainly focused on the control of insect vector, Platypus koryoensis. Neverthless the effective method for evaluating the pathogenicity of the pathogen, Raffaelea quercus-mongolicae (Rqm), and for screening chemical or biological agents with strong inhibitory activity against the pathogen, is absolutely necessary, an reliable method is not available so far. This study was conducted to develop the effective method for evaluating the pathogenicity of Rqm in oak trees. The culture suspensions of Rqm were artificially injected to the saplings of Quercus acutissima by using ChemJet tree injector. Three months after treatments, the treated saplings were cut and dipped into 1% fuchsin acid solution. There were significant differences in non-conductive area (%), discoloration area (%) and vertical discoloration length between the pathogen-injected and distilled water-injected control treatments. These results indicated that the pathogen is the causal agent for the dysfunction of water conductive tissue, which will finally result in wilt symptom. Re-isolation of the pathogen and PCR detection using specific primers for the pathogen also confirmed the presence of Rqm in the sapwood chips of the pathogen-injected saplings. These observations would be greatly applied to other related researches for evaluating the pathogenicity of tree wilt pathogens and biocontrol efficacy of the selected antagonistic microorganisms, in case that the wilt symptom is not easily shown by artificial inoculation of the causal agent.

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