Symptom

Disease rating

Disease index (%)

Disease reaction Immune

No symptoms (healthy plant)

0

0

Resistant

Small scattered vein thickening only

1

0.1 - 10

Highly tolerant

Large group of vein thickening and curling or top of the plant affected

2

10 - 30

Tolerant

All vein thickening and sever leaf curling or half of the plant affected.

3

30 - 50

Susceptible

All vein thickening, sever Leaf curling, enation and stunting of the plant or whole plant affected.

4

>50

Highly susceptible