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Chinese Agricultural Science Bulletin ›› 2026, Vol. 42 ›› Issue (7): 171-175.doi: 10.11924/j.issn.1000-6850.casb2025-0789

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Meteorological Forecast of Rice Blast Risk Level in Qiandongnan Prefecture

WEN Jianchuan1(), LAI Zhengrong1, WU Lyu2, RUAN Lingli3, WU Biliang1, LIANG Ping4()   

  1. 1 Kaili Meteorological Bureau, Kaili, Guizhou 556000
    2 Zhenyuan Meteorological Bureau, Zhenyuan, Guizhou 557700
    3 Taijiang Meteorological Bureau, Taijiang, Guizhou 556300
    4 Qiandongnan Prefecture Meteorological Bureau, Kaili, Guizhou 556000
  • Received:2025-09-15 Revised:2025-12-30 Online:2026-04-15 Published:2026-04-15

Abstract:

Based on meteorological data and rice blast records from 16 counties (cities) in Qiandongnan Prefecture from 2015 to 2021, the paper calculated a meteorological disease-promoting index Z, and established a predictive model for the meteorological grade of rice blast occurrence using regression analysis: Z=0.17x+0.90, with a correlation coefficient of 0.73. Based on the Z value, the meteorological risk of the disease was classified into 4 grades: Grade 1 (0≤Z<4), Grade 2 (4≤Z<10), Grade 3 (10≤Z<15), and Grade 4 (Z≥15). Higher grades indicated that meteorological conditions were more conducive to disease occurrence. The model was applied to predict rice blast grades across the region, achieving an accuracy rate of 69.2%. The results demonstrated that the disease-promoting index method could be effectively used for meteorological grade prediction of rice blast in Qiandongnan Prefecture, providing a scientific basis for disease prevention and control in the region.

Key words: rice, rice blast, disease-promoting index, disease severity level, meteorological factors