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Disease classification standard.
| Disease Rate | Symptom |
|---|---|
| 0 | No disease |
| 1 | The diseased area accounts for 1–5% of the total area of C. pilosula |
| 2 | The diseased area accounts for 6–25% of the total area of C. pilosula |
| 3 | The diseased area accounts for 25–50% of the total area of C. pilosula |
| 4 | The diseased area accounts for 51–75% of the total area of C. pilosula |
| 5 | The diseased area accounts for 76–100% of the total area of C. pilosula |
