Table 2: Scale 1 to 9 used for MYMV reaction.
Grade |
Description |
Reaction |
1 |
No visible symptoms on leaves |
Free |
2 |
Small yellow specks with restricted spread covering 01-5% leaf area |
Highly resistant (HR) |
3 |
Mottling of leaves covering 6-10% leaf area |
Resistant (R) |
4 |
Yellow mottling covering 11-15 % leaf area |
Moderately resistant (MR) |
5 |
Yellow mottling and discolouration of 15-20% leaf area |
Moderately resistant (MR) |
6 |
Yellow colouration of 21-30% leaves and yellow pods |
Susceptible (S) |
7 |
Pronounced yellow mottling and discolouration of leaves and pods, reduction in leaf size and stunting of plants covering 30-50% of foliage |
Susceptible (S) |
8 |
Severe yellowing discolouration of leaves covering 50-75% of foliage, stunting of plants and reduction in pod size |
Highly Susceptible (HS) |
9 |
Severe yellowing of leaves covering above foliage, stunting of plants and no pod formation |
High Susceptible (HS) |