The grading standards for the investigation of rice blast resistance in China are based on the grading standards for rice blast resistance evaluation in the International Rice Institute. Leafhopper: Grade 0: No disease; Grade 1: Brown spot with only small tip size; Grade 2: Large brown spot; Grade 3: Necrotic grey spot with small, round and even longer brown, diameter 1-2 Millimeters; Level 4: typical rice blast lesions or ovals, 1-2 cm long, often limited to two veins, lesion area less than 2% of the leaf area; 5: typical rice blast lesions, the damage area is less than 10 %; Level 6: Typical rice blast lesions with an area of ​​10% to 25%; Level 7: Typical rice blast lesions with an area of ​​26% to 50%; Level 8: Typical blast lesions, affected area 51% to 75%; 9th grade: All the leaves died. Spike and thrift: Level 0: No disease; Level 1: Incidence is less than 1%; Level 3: Incidence is between 1% and 5%; Level 5: Incidence is between 6% and 25%; Level 7: Incidence The rate was 26-50%; 9th grade: the incidence was 51-100%. Based on the total number of strains surveyed, the representative value of the disease with the highest severity, and the number of diseased plants, a disease index can be calculated. In the validation announcement of China's state-reviewed rice varieties, the comprehensive index grades of rice blast and the highest level of ear loss rate will be indicated for each species. The higher the level, the more susceptible and the more serious the disease, the more prevention and control are needed.
Similar to the rice blast resistance classification, the higher the brown planthopper resistance level is, the more susceptible it is and the more severe the damage is. Some of the varieties approved by the state, in addition to marking the resistance level of rice blast and brown planthopper, will be marked with the resistance level of bacterial blight and whitebacked planthopper. The higher the level is, the higher the damage will be. For example, in 2012, the certified rice variety Tian Youhuazhan (certification number: Guojingdao 2012001) was approved by the national government. The content of the resistance classification of the variety approval notice was written as follows: “Resistance: The rice blast disease comprehensive index was 3.6. The earliest loss rate of panicle blast was 5, Bacterial blight was 7th, BPH was 7th, and whitebacked flycatcher was 3rd level. It was roughly equivalent to middle sense rice blast, bacterial blight, brown planthopper, and mid-bearing flyback. .
Similar to the rice blast resistance classification, the higher the brown planthopper resistance level is, the more susceptible it is and the more severe the damage is. Some of the varieties approved by the state, in addition to marking the resistance level of rice blast and brown planthopper, will be marked with the resistance level of bacterial blight and whitebacked planthopper. The higher the level is, the higher the damage will be. For example, in 2012, the certified rice variety Tian Youhuazhan (certification number: Guojingdao 2012001) was approved by the national government. The content of the resistance classification of the variety approval notice was written as follows: “Resistance: The rice blast disease comprehensive index was 3.6. The earliest loss rate of panicle blast was 5, Bacterial blight was 7th, BPH was 7th, and whitebacked flycatcher was 3rd level. It was roughly equivalent to middle sense rice blast, bacterial blight, brown planthopper, and mid-bearing flyback. .
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