| Index | Percent Affected | Description |
| 0 | 0% | No disease infection |
| 1 | 5% - 15% | Few lesions of leaf spot disease infection dotted on fewer leaflets |
| 2 | 15% - 25% | Moderate lesions of leaf spot infection on fewer leaflet |
| 3 | 25% - 50% | Leaf spot infection on at least half of the fluted pumpkin plants |
| 4 | 50% - 75% | Leaf spot disease on the surface of the leaflets and showing holes |
| 5 | 75% - 85% | Leaf spot infection on almost all the leaflets with spots coalescing |
| 6 | Above 85% | About 90% of the leaflets showing leaf spot disease with leaves tearing off |