Research in Plant Disease 2013;19(3):196-200.
Published online September 30, 2013.
콩 점무늬병(Cercospora sojina Hara) 피해해석에 의한 경제적 방제수준 설정
심홍식 ( Hong Sik Shim ) , 이종형 ( Jong Hyeong Lee ) , 이용환 ( Yong Hwan Lee ) , 명인식 ( Inn Shik Myung ) , 최효원 ( Hyo Won Choi )
Establishment of Economic Threshold by Evaluation of Yield Component and Yield Damages Caused by Leaf Spot Disease of Soybean
Hongsik Shim1*, Jong-Hyeong Lee2, Yong-Hwan Lee3, Inn-Shik Myung1 and Hyo-Won Choi1
1Crop Protection Division, National Academy of Agricultural Science, Suwon 441-707, Korea
2Gyeonggi Province Agricultural Research and Extension Services, Hwasung 445-784, Korea
3Disaster Management Division, Rural Development Administration, Suwon 441-707, Korea
Received: July 02, 2013   Revised: September 13, 2013   Accepted: September 16, 2013
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 (R2 = 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.
Key Words: Leaf spot, Soybean, Threshold level, Yield loss

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