Severity Scale

Numerical Rating

Description of symptom

0

0

No disease.

1 - 20

1

Infection of the leaves with small spot lesions.

21 - 40

2

Moderate infection of leaf spot lesions spreading on the surface of the leaves.

41 - 60

3

Severe infection of the leaves with leave spot lesions almost found in all the leaflets.

61 - 80

4

Very severe infection on all the leaves with spot lesions spreading in all the leaflets and coalescing.

81 - 100

5

The entire plant are completely infected with all leaves having leaf spot disease, some of the leaves having holes and there is leaf tearing.