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Table 2 An improved 16-class quantitative ordinal scale for general assessment of plant disease severity based on the scale developed by Chiang et al. (2014)

From: From visual estimates to fully automated sensor-based measurements of plant disease severity: status and challenges for improving accuracy

Ordinal equivalent

Midpoint

Severity (% range)

0

–

–

1

0.05

0+ to 0.1

2

0.30

0.1+ to 0.5

3

0.75

0.5+ to 1.0

4

1.50

1.0+ to 2.0

5

3.50

2.0+ to 5.0

6

7.50

5.0+ to 10.0

7

15.0

10.0+ to 20.0

8

25.0

20.0+ to 30.0

9

35.0

30.0+ to 40.0

10

45.0

40.0+ to 50.0

11

55.0

50.0+ to 60.0

12

65.0

60.0+ to 70.0

13

75.0

70.0+ to 80.0

14

85.0

80.0+ to 90.0

15

95.0

90.0+ to 100.0