This article provides insufficient context for those unfamiliar with the subject.(May 2007) |
The Horsfall-Barratt scale [1] is a system of assessing plant diseases where
Index | Percent Affected |
---|---|
1 | 0 |
2 | 0 to 3 |
3 | 3 to 6 |
4 | 6 to 12 |
5 | 12 to 25 |
6 | 25 to 50 |
7 | 50 to 75 |
8 | 75 to 87 |
9 | 87 to 94 |
10 | 94 to 97 |
11 | 97 to 100 |
12 | 100 |
The scale is often used in modified form with index values from 0-11 or with different numbers of index points.