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{{Short description|Plant disease assessment scale}}
▲The '''Horsfall-Barratt scale''' <ref name=Horsfall&Barratt>{{Citation
| last1 = Horsfall | first1 = J. G.
| last2 = Barratt | first2 = R. W.
| title = An Improved Grading System for Measuring Plant Disease. (Abstract.)
| journal = [[Phytopathology (journal)|Phytopathology]]
| publisher = [[American Phytopathological Society]]
| year = 1945
is a system used in [[plant pathology]] to assess [[Phytopathology|plant diseases]] where each plant is assigned a numerical value according to the percentage of leaf area showing disease symptoms. The Horsfall-Barratt scale was designed to compensate for human error in estimating the amount of disease present. The scale is as follows: ▼
| volume=35
▲| pages=655}}</ref><ref name="ISI-CC-review" /><ref name="Horsfall-1945" /><ref name="Horsfall-1978-reprint" /> is a system used in [[plant pathology]] to assess [[Phytopathology|plant diseases]] where each plant is assigned a numerical value according to the percentage of [[leaf]] area showing disease symptoms. The
{| class="wikitable"
! Index !! Percent Affected
|-
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|-
| 12 || 100
|}
The scale is often used in modified form with index values from 0–11 or with different numbers of index points.
== References ==
{{reflist|refs=
<ref name="ISI-CC-review">
{{cite journal
| url=http://www.garfield.library.upenn.edu/classics1986/A1986A666500001.pdf
| title=This Week's Citation Classic
| journal=[[Current Contents]]
| publisher=[[Institute for Scientific Information]]
| date=14 April 1986
| page=14
| number=15
}}
</ref>
<ref name="Horsfall-1945">
{{cite journal|last=Horsfall|first=J G|title=Fungicides and their action|location=[[Waltham, Massachusetts]]|journal=[[Chronica Botanica]]|date=1945|pages=1–239|isbn=9788172680022}} ({{google books|title=Fungicides and Their Action|id=d_gfAAAAIAAJ}})
</ref>
<ref name="Horsfall-1978-reprint">
{{cite book|last1=Horsfall|first1=J G|last2=Cowling|first2=E B|chapter=Pathometry: the measurement of plant disease|editor-last1=Horsfall|editor-first1=J G|editor-last2=Cowling|editor-first2=E B|title=Plant disease: an advanced treatise. Volume II: How disease develops in populations|location=[[New York City]]|publisher=[[Academic Press]]|date=1978|pages=119–36}}
</ref>
}}
==Further reading==
* {{cite journal | last1=Bock | first1=C. H. | last2=Gottwald | first2=T. R. | last3=Parker | first3=P. E. | last4=Ferrandino | first4=F. | last5=Welham | first5=S. | last6=van den Bosch | first6=F. | last7=Parnell | first7=S. | title=Some Consequences of Using the Horsfall-Barratt Scale for Hypothesis Testing | journal=[[Phytopathology (journal)|Phytopathology]] | publisher=[[American Phytopathological Society]] | volume=100 | issue=10 | year=2010 | issn=0031-949X | doi=10.1094/phyto-08-09-0220 | pages=1030–1041| pmid=20839938 | doi-access=free }}
{{DEFAULTSORT:Horsfall-Barratt scale}}
[[Category:Plant
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