Blotches at the petiole base
Record the relative surface area coverage by blotches. Look at several plants if possible to get an overall idea. Observe at lowering time.

| Code | Term | Description |
|---|---|---|
| 1 | No pigmentation | |
| 2 | Sparse blotching | <20% |
| 3 | Moderate blotching | 20%-50% |
| 4 | Extensive pigmentation | >50% |