Research in Plant Disease (식물병연구)

The Korean Society of Plant Pathology (한국식물병리학회)
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Establishment of Economic Threshold by Evaluation of Yield Component and Yield Damages Caused by Leaf Spot Disease of Soybean

콩 점무늬병(Cercospora sojina Hara) 피해해석에 의한 경제적 방제수준 설정

  • Shim, Hongsik (Crop Protection Division, National Academy of Agricultural Science) ;
  • Lee, Jong-Hyeong (Gyeonggi Province Agricultural Research and Extension Services) ;
  • Lee, Yong-Hwan (Disaster Management Division, Rural Development Administration) ;
  • Myung, Inn-Shik (Crop Protection Division, National Academy of Agricultural Science) ;
  • Choi, Hyo-Won (Crop Protection Division, National Academy of Agricultural Science)
  • Received : 2013.07.02
  • Accepted : 2013.09.16
  • Published : 2013.09.30
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Abstract

This study was carried out to investigate yield loss due to soybean leaf spot disease caused by Cercospora sojina Hara and to determine the economic threshold level. The investigations revealed highly significant correlations between disease severity (diseased leaf area) and yield components (pod number per plant, total grain number per plant, total grain weight per plant, percent of ripened grain, weight of hundred seed, and yield). The correlation coefficients between leaf spot severity and each component were -0.90, -0.90, -0.92, -0.99, -0.90 and -0.94, respectively. The yield was inversely proportional to the diseased leaf area increased. The regression equation, yield prediction model, between disease severity (x) and yield (y) was obtained as y = -3.7213x + 354.99 ($R^2$ = 0.9047). Based on the yield prediction model, economic injury level and economic threshold level could be set as 3.3% and 2.6% of diseased leaf area of soybean.

콩 점무늬병이 수량에 미치는 영향을 평가하고 경제적 방제수준을 설정하고자 본 시험을 수행하였다. 점무늬병 발병정도와 주당 협수, 주당 총립수, 주당 총립중, 등숙률, 100립중 및 수량과의 상관계수는 각각 -0.90, -0.90, -0.92, -0.99, -0.90, -0.94로 통계적으로 고도의 유의성을 나타내었다. 콩 점무늬병의 병반면적률이 증가됨에 따라 수량은 반비례하여 감소하였는데, 콩 점무늬병 발병정도(x)에 따른 수량(y) 예측모델을 산출한 결과, 회귀식은 y = -3.7213x + 354.99($R^2$= 0.9047)로 고도의 부의 상관이 있었다. 이 회귀식을 토대로 경제적 피해허용수준은 병반 면적률 3.3%, 경제적 방제수준(ET)은 병반면적율 2.6%로 설정할 수 있었다.

Keywords

References

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