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Establishment of Economic Threshold by Evaluation of Yield Component and Yield Damages Caused by Rice Leaf Blast (Magnaporthe grisea)

벼 잎도열병 피해해석에 의한 경제적 방제수준 설정

  • Yeh, Wan-Hee (Plant Pathology Division, Agricultural Biology Department, National Institute of Agricultural Science and Technology) ;
  • Park, Hong-Hyun (Applied Entomology Division, Agricultural Biology Department, National Institute of Agricultural Science and Technology) ;
  • Nam, Young-Ju (Plant Pathology Division, Agricultural Biology Department, National Institute of Agricultural Science and Technology) ;
  • Kim, Seol-A (Plant Pathology Division, Agricultural Biology Department, National Institute of Agricultural Science and Technology) ;
  • Lee, Jeong-Hee (Plant Pathology Division, Agricultural Biology Department, National Institute of Agricultural Science and Technology) ;
  • Shim, Hong-Sik (Plant Pathology Division, Agricultural Biology Department, National Institute of Agricultural Science and Technology) ;
  • Kim, Yong-Ki (Plant Pathology Division, Agricultural Biology Department, National Institute of Agricultural Science and Technology) ;
  • Lee, Yong-Hwan (Plant Pathology Division, Agricultural Biology Department, National Institute of Agricultural Science and Technology) ;
  • Lee, Yeong-Hoon (Plant Pathology Division, Agricultural Biology Department, National Institute of Agricultural Science and Technology)
  • 예완해 (농업과학기술원 농업생물부 식물병리과) ;
  • 박홍현 (농업과학기술원 농업생물부 농업해충과) ;
  • 남영주 (농업과학기술원 농업생물부 식물병리과) ;
  • 김설아 (농업과학기술원 농업생물부 식물병리과) ;
  • 이정희 (농업과학기술원 농업생물부 식물병리과) ;
  • 심홍식 (농업과학기술원 농업생물부 식물병리과) ;
  • 김용기 (농업과학기술원 농업생물부 식물병리과) ;
  • 이용환 (농업과학기술원 농업생물부 식물병리과) ;
  • 이영훈 (농업과학기술원 농업생물부 식물병리과)
  • Published : 2008.04.01

Abstract

This study was conducted to decide disease incidence level of rice leaf blast required for reasonable fungicide application in paddy field. We induced the disease development by inoculating rice blast pathogens on rice seedlings (Jinmibyeo) in the greenhouse and transplanting the infected seedlings in the field two weeks after rice plants were transplanted. We scored the disease incidence, grouped and marked according to degree of percentage of diseased leaf area at maximum stage of disease development. The percent diseased leaf area (PDLA) had negative correlations with panicle number per hill, ripened grain (%), and total yield; their correlation coefficients (r), $-0.97^{**}$, $-1.00^{**}$ and $-0.96^{**}$, respectively. However, it had positive correlations with spikelets per panicle and thousand grain weight; their correlation coefficients (r), $0.98^{**}$ and $0.98^{**}$, respectively. Gain threshold (GT) calculated based on control cost and market price was estimated to be 8.35. Economic injury level (EIL) obtained based on GT and coefficient of damage of regression equation between disease incidence and the different yield components; panicle number per hill, spikelets per panical, ripened grain(%), thousand grain weight and yield were 41.8, 9.7, 19.1, 291.1 and 3.4%, respectively. Economic threshold (ET) for yield was 2.7% ($3.4%(EIL){\times}0.8$) on PDLA. These results suggest that application of fungicide is necessary when two under leaves are almost covered with lesions or contained more than twenty large lesions under leaves at maximum tillering stage.

본 연구는 잎도열병에 대한 합리적 약제방제수준을 설정하기 위하여 수행하였다. 발병은 온실에서 도열병균을 접종하여 발병시킨 전파식물을 시험식물 이앙 2주 후에 이식하여 발병을 유도하였다. 발병정도 설정은 병 발생 최성기에 병반면적율에 따라 수준을 설정하고 표식하였다. 병반면적율에 따라 주당이삭수, 이삭당입수, 등숙율, 천립중 그리고 수량에 대한 상관을 분석한 결과 주당이삭수, 등숙율, 수량과는 1%수준에서 -0.97, -1.00, -0.96의 부의 상관이 있었으며, 이삭당입수와 천립중은 1% 수준에서 공히 0.98의 정의 상관이 있었다. 수익역치(GT) 값은 방제비용을 쌀 시장가격으로 나누어 8.35가 되며, 경제적 피해수준(EIL)은 수익역치값을 회귀식의 피해계수로 나눈 값이 된다. 경제적 방제수준(ET)은 EIL값에다 80%를 곱한 값이 된다. 본 시험에서의 경제적 피해허용 수준은 주당 이삭수, 이삭당입수, 등숙율, 천립중, 수량에서 각각 병반면적율 41.77%, 9.74%, 19.01%, 291.06%, 3.36%가 된다. 수량에 대한 경제적 방제수준은 2.7%가 된다($3.4%(EIL){\times}0.8$). 수량에서의 경제적 방제수준은 하위 2엽이 거의 병반으로 덮여 있거나 20개 이상의 대형병반이 하위엽에 발생하였을 때 방제하는 시점으로 나타났다.

Keywords

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