| Code | Definition | Number of Accessions |
| 1 | very low very many rotten berries on all clusters are attacked, drop off of all clusters | 1 |
| 3 | low very many wilted and part rotted clusters, drop off of all clusters | 19 |
| 5 | medium up to 20 % wilted or rotted clusters are moderately atacked, only some clusters are attacked more severely, drop off of clusters is only slight | 98 |
| 7 | high only a few wilted or rotten berries in clusters, no drop off of clusters | 40 |
| 9 | very high (Isabella N) only single clusters are slightly attacked, no drop off of clusters | 69 |