Yield Loss Assessment and Determination of Economic Thresholds Limits against Soybean Anthracnose

콩탄저병의 피해 해석 및 요방제 수준 설정

  • Moon, Youn-Gi (Agricultural Environment Research Section, Gangwon Provincial Agricultural Research & Extension Services) ;
  • Lee, Jae-Hong (Agricultural Environment Research Section, Gangwon Provincial Agricultural Research & Extension Services) ;
  • Choi, Jun-Keun (Agricultural Environment Research Section, Gangwon Provincial Agricultural Research & Extension Services) ;
  • Kang, An-Seok (Agricultural Environment Research Section, Gangwon Provincial Agricultural Research & Extension Services) ;
  • Han, Seong-Sook (Agricultural Microbiology Division, National Academy of Agricultural Sciences)
  • 문윤기 (강원도농업기술원 환경농업연구과) ;
  • 이재홍 (강원도농업기술원 환경농업연구과) ;
  • 최준근 (강원도농업기술원 환경농업연구과) ;
  • 강안석 (강원도농업기술원 환경농업연구과) ;
  • 한성숙 (국립농업과학원 농업미생물과)
  • Received : 2010.04.21
  • Accepted : 2010.05.03
  • Published : 2010.06.30

Abstract

A field investigation was carried out for two years to analyze yield loss due to soybean anthracnose caused by Colletotrichum truncatum and to determine its economic threshold limit. Anthracnose severity in terms of % diseased pods was negatively correlated with yield, number of normal seeds per plant and number of pods per plant, and positively correlated with % abnormal seeds with correlation coefficients of -0.85, -0.78, -0.64, and 0.80, respectively. A simple linear regression model was obtained as Y=-1.7781X+164.22 with $R^2$=0.8092, when the soybean yields (Y) were predicted using anthracnose severity (X) as an independent variable. The yield levels could be predicted as high as 80.92%. Based on this equation, spray threshold without economic considerations was estimated as 6.9 in % pods infected with anthracnose. Economic threshold limit and economic spray threshold able to compensate the costs of fungicide sprays were determined as 11.9% and 9.5%, respectively.

Keywords

soybean anthracnose;yield loss assessment;economic threshold

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