Score | Visual observation | Response |
0 | No infection | Resistant |
1 | 0.1% - 7.0% | Tolerant |
2 | 7.1% - 15.0% | Moderately susceptible |
3 | 15.1% - 25.0% | Susceptible |
4 | 25.1% - 100.0% | Highly susceptible |