Disease score (Score) Disease severity 0         No infection 1           0.1 to 5 % leaf area affected 2           5.1 to 15 % leaf area affected 3           15.1 to 30 % leaf area affected 4           30.1 to 50 % leaf area affected 5           50.1 to 100 % leaf area affected

Table 1: Description of the disease score and Per cent Disease Incidence (PDI).