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Chinese Agricultural Science Bulletin ›› 2023, Vol. 39 ›› Issue (29): 74-78.doi: 10.11924/j.issn.1000-6850.casb2022-1008

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Methodology and Application of Weather Level Forecasting of Rice Sheath Blight

CHU Daiwei1(), ZHANG Zhouna2, WANG Qiongjie1(), HONG Ran3, XUE Wenjing1   

  1. 1 Yuhang Meteorological Bureau of Hangzhou, Hangzhou 311100
    2 Yuhang Agricultural ecology and Plant protect Station of Hangzhou, Hangzhou 311100
    3 Hangzhou Meteorological Bureau, Hangzhou 310051
  • Received:2022-11-30 Revised:2023-01-05 Online:2023-10-15 Published:2023-10-11

Abstract:

To establish a prediction model for rice sheath blight based on weather forecasting products, so that we can judge the degree of the influence of weather trends on disease occurrence and provide early warning of it, and improve control efficiency. By means of comprehensive analysis of rice sheath blight field observation data from 1987 to 2019, we screened out disease monitoring periods and disease promoting meteorological indicators. Next, we proposed a daily disease promoting index calculation method based on the disease occurrence mechanism. Meanwhile, we constructed a disease plant rate prediction model and grading scheme on account of daily disease promoting index, combined with weather forecasting products for operational application in 2020. The results showed that there was a highly significant linear correlation between the daily disease promotion index and daily disease plant rate which came to 0.797 (P<0.001), Y=-0.032+0.147X (R2=0.634). In addition, the accuracy of model back verification was 83.3%; the average forecast accuracy of the applied model from 2018 to 2020 was 82.4%. In consequence, the meteorological forecast levels are in good agreement with the actual disease in the field and can be used in daily weather level forecasting operations for rice sheath blight.

Key words: rice sheath blight, daily disease promotion index, daily disease plant rate, prediction, application