Scale

% leaf area infected

Description

0 - 1

0

no infection

1 - 2

3

>1% but <10%

2 - 3

10

11 - 20 small lesions

3 - 4

25

10% leaf area infected

4 - 5

50

25% leaf area infected

5 - 6

75

50% leaf area infected

6 - 7

90

75% leaf area infected

7 - 8

97

Only few green areas left (much less than 10%)

8 - 9

100

foliage completely destroyed/dead