| Code | Definition | Number of Accessions | |
| 1 | No visual symptoms expressed, plant vigorous | 5 | |
| 2 | Plant infected, slight yellowing and stunting symptoms, enation present | 35 | |
| 3 | Plant infected, moderate yellowing and stunting symptoms, enations pronounced | 342 |  |
| 4 | Plant infected, severe yellowing and stunting | 882 | |
| 5 | Plant infected, plant dead or dying | 1301 |  |