Research in Plant Disease 2003;9(2):68-71.
Published online June 30, 2003.
벼 이삭도열병의 발병시기에 따른 수량감소 비교
심홍식, 김용기, 한성숙, 성재모
 
Assessments of Rice Yield Loss According to Infection Time of Neck Blast
Hong Sik Shim, Yong Ki Kim, Seong Sook Han, Jae Mo Sung
Abstract
Correlation between rice yield loss and infection time of neck blast after panicle emergence was analyzed in paddy fields at Icheon in 1999 and 2000. As the neck blast occurred at early heading stage, the yield loss of a early maturity variety, Jinmibyeo, ranged from 83.9% to 81.6%, while it ranged from 44.3% to 33.1% when the disease developed 30 days after heading. The regression equations of yield loss(y) caused by the neck blast infection time(x) in Jinmibyeo were y = -1.2717x + 79.523(R² = 0.9487) and y = -1.6872x + 74.545(R²= 0.7993) in 1999 and 2000. In a mid-lately maturity variety, Chucheongbyeo, yield loss ranged from 64.9% to 47.8% when the disease developed at early heading stage. While it ranged from 29.1% to 8.9% when the disease occurred 40 days after heading. The regression equations of yield loss caused by the disease in Chucheongbyeo were y = -1.2717x + 79.523(R² = 0.9487) and y = -1.6872x + 74.545(R² = 0.7993) in 1999 and 2000. Weights of 1,000 rice grains of Jinmibyeo and Chucheongbyeo were also drastically decreased to 38.3% and 57.3%, respectively, compared to healthy control when the disease occurred at early heading stage. However, weights of the two cultivars were 87.6% and 92.9% compared to control when the disease developed after 40 days of heading. Results indicated that there is a highly negative correlation between rice yield loss and infection time of the neck blast.
Key Words: correlation, 1, 000 grains weight, infection time, neck blast, yield Loss


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