초록

본 연구는 잎도열병에 대한 합리적 약제방제수준을 설정하기 위하여 수행하였다. 발병은 온실에서 도열병균을 접종하여 발병시킨 전파식물을 시험식물 이앙 2주 후에 이식하여 발병을 유도하였다. 발병정도 설정은 병 발생 최성기에 병반면적율에 따라 수준을 설정하고 표식하였다. 병반면적율에 따라 주당이삭수, 이삭당입수, 등숙율, 천립중 그리고 수량에 대한 상관을 분석한 결과 주당이삭수, 등숙율, 수량과는 1%수준에서 -0.97, -1.00, -0.96의 부의 상관이 있었으며, 이삭당입수와 천립중은 1% 수준에서 공히 0.98의 정의 상관이 있었다. 수익역치(GT) 값은 방제비용을 쌀 시장가격으로 나누어 8.35가 되며, 경제적 피해수준(EIL)은 수익역치값을 회귀식의 피해계수로 나눈 값이 된다. 경제적 방제수준(ET)은 EIL값에다 80%를 곱한 값이 된다. 본 시험에서의 경제적 피해허용 수준은 주당 이삭수, 이삭당입수, 등숙율, 천립중, 수량에서 각각 병반면적율 41.77%, 9.74%, 19.01%, 291.06%, 3.36%가 된다. 수량에 대한 경제적 방제수준은 2.7%가 된다($3.4%(EIL){\times}0.8$). 수량에서의 경제적 방제수준은 하위 2엽이 거의 병반으로 덮여 있거나 20개 이상의 대형병반이 하위엽에 발생하였을 때 방제하는 시점으로 나타났다.

Abstract

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% ($3.4%(EIL){\times}0.8$) 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.

주제어

#Economic threshold   #Fungicide application   #Leaf blast   #PDLA   #Rice  

참고문헌 (12)

1. Allen, W. A. and Rajotte, E. G. 1990. The Changing role of extension entomology in the IPM area. Ann. Rev. Entomol. 35: 379-397 
2. Chen, C. N. and Cheng, C. C. 1978. The population levels of Nilaparvata lugens(Stal) in relation to the yield loss of rice. 1. Plant prot. Bull.(Taiwan) 20: 197-209 
3. Kawamura, T. and lzumi, K. 1998. Control threshold of the rice leaf roller moth, Cnaphlocrocis medinalis Guenee (Lepidoptera : Pyralidae) using leaf color and adult density. Bull. Yamaguchi Agri. Expt. Stn.. 49: 25-31 (In Japanese) 
4. McGrath, M. T. and Staniszewska, H. 1996. Management of powdery mildew in summer squash with host resistance, disease threshold-based fungicide programs, or an integrated program. Plant Dis. 80: 1044-1052 
5. Ye, C. F. and Zhu, Y. Q. 1999. The economic threshold of Scotinophara lurida in seedling stage of rice. Ecological Knowledge. 36: 132-134 (In Chinese) 
6. Stone, J. D. and Pedigo, L. P. 1972. Development and economic injury level of the green clover worm on soybean in Iowa. J.Econ. Entom. 65: 197-201 
7. 예완해, 이정희, 김설아, 심홍식, 김용기. 2006. 잎도열병 피해해석에 의한 요방제수준 설정 연구. 2005 농업생물연구(농업 과학기술원), 1227 pp 
8. Stern, V. M., Smith, R. F., Van den Bosch, R. and Hagen, K. S. 1959. The integrated control concept. Hilgardia. 28: 81-101 
9. 박홍현, 예완해, 박형만. 2007. 주요 작물 및 가지 병해충에 대한 수익역치 추정. 한국응용곤충학회 46: 63-69  원문보기 상세보기
10. 김진영, 홍순성, 이진구, 박경열, 김홍기, 김진원. 2006. 오이 흰가루병의 경제적 피해허용수준 설정. 식물병연구 12: 231- 234  원문보기 상세보기
11. Pedigo, L. P., Hutchins, S. H. and Higley, L. G. 1986. Economic injury level in theory and Practice. Ann. Rev. Entomol. 31: 341-368 
12. Whalon, M. E. and Croft, B. A. 1984. Apple IPM implementation in North America. Ann. Rev. Entomol. 29: 435-470 

이 논문을 인용한 문헌 (4)

1. Kang, Hyo-Jung ; Jeong, Kyeong-Heon ; Ahn, Ki-Su ; Han, Chong-U ; Kim, Sang-Hee ; Kim, Yee-Gi 2011. "Damage Analysis and Establishment of Control Threshold for Phytophthora Blight of Hot Pepper (Capsicum annuum)" Research in plant disease = 식물병연구, 17(1): 1~12  원문보기 상세보기
2. Shim, Hongsik ; Lee, Jong-Hyeong ; Lee, Yong-Hwan ; Myung, Inn-Shik ; Choi, Hyo-Won 2013. "Establishment of Economic Threshold by Evaluation of Yield Component and Yield Damages Caused by Leaf Spot Disease of Soybean" Research in plant disease = 식물병연구, 19(3): 196~200  원문보기 상세보기
3. Shim, Myung Syun ; Lim, Jin Hee ; Kim, Jeom-Soon ; Yoo, Seong Joon 2014. "Development of customized control modules for the model forecasting the occurrence of potato late blight" 농업과학연구 = CNU Journal of agricultural science, 41(1): 23~27  원문보기 상세보기
4. Shim, Myung Syun ; Lim, Jin Hee ; Kim, Jeom-Soon ; Yoo, Seong Joon 2014. "Development of customized control modules for the model forecasting the occurrence of phytophthora blight on hot pepper" 농업과학연구 = CNU Journal of agricultural science, 41(1): 29~34  원문보기 상세보기