Scale | Description |
---|---|
0 | No symptom spot on the leaf |
1 | 1-20% leaf area infected and covered by spot |
2 | 21-40% leaf area infected and covered by spot |
3 | 41-60% leaf area infected and covered by spot |
4 | 61-80% leaf area infected and covered by spot |
5 | 80% leaf area infected and covered by spot |