Weed & Turfgrass Science

The Korean Society of Weed Science & The Turfgrass Society of Korea Archive (한국잡초학회 & 한국잔디학회)
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Investigation of Fungicides Inhibitory Effect of on Summer Patch Disease, Caused by Magnaporthiopsis poae, in Kentucky bluegrass

여름잎마름병(Summer patch) 병원균에 대한 살균제의 억제효과 조사

  • Lee, Jung Han (Korea Turfgrass Research Institute) ;
  • Shim, Gyu Yul (Korea Turfgrass Research Institute) ;
  • Kim, Jeong Ho (Korea Turfgrass Research Institute) ;
  • Jeon, Chang Wook (Dvision of Applied Life Science(BK21Plus) and Institute of Agriculture & Life Science, Gyeongsang National University) ;
  • Kwak, Youn-Sig (Dvision of Applied Life Science(BK21Plus) and Institute of Agriculture & Life Science, Gyeongsang National University)
  • Received : 2017.01.06
  • Accepted : 2017.06.14
  • Published : 2017.06.30
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Abstract

Summer patch is the most serious disease at turfgrass field or golf course established with Kentucky bluegrass during high temperature season in Korea. Nevertheless, chemicals for the summer patch control are not yet registered in Korea. We isolated the pathogens from the turfgrass showing typical summer patch symptoms and identified as Magnaporthiopsis poae by using the internal transcribed spacer ITS1 and ITS4 sequences of rDNA. The inhibition rates of the pathogen were investigated for 10 fungicides. As results, the pathogen growth was suppressed when chemicals concentration increased and negatively correlated with incubation period with the chemicals. In triazole group, all chemicals (metconazole, myclobutanil, propiconazole and tebuconazole) treated showed the inhibition rates by 100%. Thiophanate-methyl showed the next highest inhibition effect against a summer patch pathogen. In strobilurin group, pyraclostrobin was the highest suppression effect compared with azoxystrobin and trifloxystrobin. Inhibition effect of fludioxonil and fluxapyroxad on pathogen was similar to the trifloxystrobin. Based on the results, triazole and carboxamide groups are strongly recommended due to the highest inhibition effect on the summer patch pathogen, Magnaporthiopsis poae.

국내 Kentucky bluegrass로 조성된 골프장이나 잔디 재배지에서 여름철에 여름잎마름병 발생으로 인한 피해가 심각한 상황이다. 그럼에도 불구하고 여름잎마름병방제약제가 아직까지 등록되어있지 않아 병원균에 효과적인 약제를 선발하기 위하여 본 연구를 수행하였다. 전형적인 여름잎마름병 병징에서 병원균을 분리하였고 ITS1과 ITS4 염기서열 분석으로 Magnaporthiopsis poae로 동정되었다. 잔디용으로 사용되는 10개의 약제를 대상으로 병원균 반응을 조사한 결과, 약제의 농도가 높아질수록 병원균 생장을 억제하였고 시간이 경과할수록 병원균 억제효과가 떨어지는 것이 관찰되었다. triazole계 약제 4종(metconazole, myclobutanil, propiconazole과 tebuconazole)의 병원균 억제효과는 100%로 나타났다. 다음으로 thiophanate-methyl의 억제효과가 높았으며 strobilurin계의 약제인 azoxystrobin, pyraclostrobin과 trifloxystrobin 약제를 비교하였을 때는 pyraclostrobin 약제가 가장 높게 나타났으며 다음으로 azoxystrobin과 trifloxystrobin 순으로 나타났다. Fludioxonil과 fluxapyroxad의 병원균 억제효과는 trifloxystrobin과 유사하게 나타났다.

Keywords

References

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