| Code | Definition | Number of Accessions |
| 1 | Slight discoloration around cotyledonary attachment area | 50 |
| 2 | Lessions have coalesced, but do not encircle lower stem. Cotyledons are still intact. | 362 |
| 3 | Pronounced brownish-black lessions which have coalesced at the cotyledonary attachment area, cotyledons have rotted off. Lower stem lessions are visible, few to moderate lesion development on lower stem and upper root. | 721 |
| 4 | Pronounced brownish-black lesions at cotyledonary attachment area. Lesions extend upward to soil line and down into root system. | 957 |
| 5 | Root system completely rotted, including coryledonary attachment area up to soil line and/or seed rotted and plant did not emerge. | 835 |