Severity Scale | Numerical Rating | Description of symptom |
0 | 0 | No disease. |
1 - 20 | 1 | Infection of the leaves with small spot lesions. |
21 - 40 | 2 | Moderate infection of leaf spot lesions spreading on the surface of the leaves. |
41 - 60 | 3 | Severe infection of the leaves with leave spot lesions almost found in all the leaflets. |
61 - 80 | 4 | Very severe infection on all the leaves with spot lesions spreading in all the leaflets and coalescing. |
81 - 100 | 5 | The entire plant are completely infected with all leaves having leaf spot disease, some of the leaves having holes and there is leaf tearing. |