벼 잎도열병 피해해석에 의한 경제적 방제수준 설정 (Establishment of Economic Threshold by Evaluation of Yield Component and Yield Damages Caused by Rice Leaf Blast (Magnaporthe grisea))

서지정보

· 발행기관 : 한국식물병리학회
· 수록지 정보 : 식물병 연구 / 14권 / 1호 / 21 ~ 25페이지
· 저자명 : 예완해, 박홍현, 심홍식, 남영주, 김설아, 이정희, 김용기, 이용환, 이영훈

초록

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) × 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.

영어초록

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) × 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.

참고자료

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