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| Infection type | Disease severity symptoms |
|---|---|
| 0 | No visible symptoms |
| 1 | 1–5% visible/noticeable spots on leaves |
| 2 | 6–20% visible/noticeable spots on leaves |
| 3 | 21–40% visible/noticeable spots on leaves |
| 4 | 41–60% visible/noticeable spots on leaves |
| 5 | More than 60% visible spots on leaves |
