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Horsfall-Barratt scale



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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.

References

  1. ^ Horsfall & Barratt (1945), " ", Phytopathology

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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Horsfall-Barratt_scale". A list of authors is available in Wikipedia.
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