Table 1 Categorization standard of rice leaves under the bacterial blight disease
Disease level | Symptoms |
|---|---|
Level 0 | No clear spot is shown |
Level 1 | It appears 2–3 cm white spots, or even few brown spots are shown. The spot area is account for 10% of the leaf |
Level 2 | The length of appeared spots is less than a quarter of the leaf’s length, or the spot area is account for 20% of the leaf |
Level 3 | The length of appeared spots is between a quarter and half of the leaf’s length, or the spot area is account for 20–49% of the leaf |
Level 4 | The length of appeared spots is between a half and three quarters of the leaf’s length, or the spot area is account for 50–74% of the leaf |
Level 5 | The length of appeared spots reaches beyond three quarters of the leaf’s length, or the spot area is account for more than 75% of the leaf |