Table 1 Illustration and description of the visual rating scale (VRS) used to evaluate the symptoms observed on the aerial parts of the seedlings
Illustration of a representative cotyledon/seedling | Visual rating description |
|---|---|
| Rating = 0 No mycelium colonization nor necrosis on seedlings No impact on seedling development, four-leaf stage seedlings in general |
| Rating = 1 Minimal mycelium colonization and necrosis on seedlings (< 25% of surface area) No impact on seedling development, four-leaf stage seedlings in general |
| Rating = 2 Mycelium colonization and necrosis on seedlings (25% < necrosis < 50% of surface area) Small impact on seedling development, smaller four-leaf stage seedlings in general |
| Rating = 3 Important mycelium colonization and necrosis on seedlings (50% < necrosis < 75% of surface area) Impact on seedling development, two-leaf stage seedlings in general |
| Rating = 4 Almost total mycelium colonization and necrosis on seedlings (75% < necrosis < 99% of surface area) Important impact on seedling development, cotyledon stage seedlings in general |
| Rating = 5 Total mycelium colonization and necrosis on seedlings (= 100% of surface area) Dead cotyledon stage seedlings |
