(incidence classes CBB: 1=no symptom; 2=plants with water-soaked spots only; 3=plants with water-soaked spots and 1–50% of plants with systemic infection; 4=51–89% of plants with systemic infection; 5=90–100% of plants with systemic infection; and incidence classes CMD: 1=no symptom; 2=1–25% of plants with symptoms; 3=26–50% of plants with symptoms; 4=51–75% of plants with symptoms; 5=76–100% of plants with symptoms).