| Code | Definition | Number of Accessions |
| 0 | no vascular discoloration | 1 |
| 1 | 1 to 25% of the vascular tissue exhibiting discoloration | 6 |
| 2 | 26 to 50% of the vascular tissue exhibiting discoloration | 20 |
| 3 | 51 to 75% of the vascular tissue exhibiting discoloration | 91 |
| 4 | 76 to 100% discoloration in the absence of foliar symptoms | 153 |
| 5 | 100% discoloration and the presence of foliar symptoms typical of Verticillium wilt | 108 |