International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
(Digitaria sanguinalis)

ACCase inhibitors (A/1)

United States, Wisconsin
Large Crabgrass (Digitaria sanguinalis) is a monocot weed in the Poaceae family.  In Wisconsin this weed first evolved resistance to Group A/1 herbicides in 1992 and infests Carrots, and Onions.   Group A/1 herbicides are known as ACCase inhibitors (Inhibition of acetyl CoA carboxylase (ACCase)).  Research has shown that these particular biotypes are resistant to fluazifop-P-butyl, and sethoxydim and they may be cross-resistant to other Group A/1 herbicides.

The 'Group' letters/numbers that you see throughout this web site refer to the classification of herbicides by their site of action. To see a full list of herbicides and HRAC herbicide classifications click here.

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QUIK STATS (last updated Sep 15, 2000 )

Common NameLarge Crabgrass
SpeciesDigitaria sanguinalis
GroupACCase inhibitors (A/1)
Herbicidesfluazifop-P-butyl, and sethoxydim
LocationUnited States, Wisconsin
Situation(s)Carrots, and Onions
Contributors - (Alphabetically)David Stoltenberg 
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David Stoltenberg
Cross-resistant to sethoxydim. Ploughed under many acres of onions. Initial year that they collected seed they ploughed under 90 acres of onions to avoid contamination. Large corporate farm.

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Confirmation Tests

Field, and Greenhouse trials comparing a known susceptible Large Crabgrass biotype with this Large Crabgrass biotype have been used to confirm resistance. For further information on the tests conducted please contact the local weed scientists that provided this information.

Genetic studies on Group A/1 resistant Large Crabgrass have not been reported to the site.  There may be a note below or an article discussing the genetics of this biotype in the Fact Sheets and Other Literature
Mechanism of Resistance

The mechanism of resistance for this biotype is either unknown or has not been entered in the database.  If you know anything about the mechanism of resistance for this biotype then please update the database.
Relative Fitness

There is no record of differences in fitness or competitiveness of these resistant biotypes when compared to that of normal susceptible biotypes.  If you have any information pertaining to the fitness of Group A/1 resistant Large Crabgrass from Wisconsin please update the database.
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University of Wisconsin-Madison
1575 Linden Dr
Madison, 53706-1514, Wisconsin
United States
Email David Stoltenberg
Web   : Web Site Link


The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Wisconsin have been instrumental in providing you this information. Particular thanks is given to David Stoltenberg for providing detailed information.
Herbicide Resistant Large Crabgrass Globally
(Digitaria sanguinalis)
Herbicide Resistant Large Crabgrass Globally
(Digitaria sanguinalis)
Drag a column header and drop it here to group by that column
Herbicide Resistant Large Crabgrass Globally
(Digitaria sanguinalis)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Australia (South Australia) AustraliaSouth Australia1993 Onions, and Vegetables fluazifop-P-butyl, haloxyfop-methyl, and imazethapyr 1 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
77Digitaria sanguinalisLarge Crabgrass16
2 Canada (Ontario) CanadaOntario2011 Carrots, and Onions clethodim, fenoxaprop-P-ethyl, fluazifop-P-butyl, quizalofop-P-ethyl, and sethoxydim 7 ACCase inhibitors (A/1)
77Digitaria sanguinalisLarge Crabgrass5678
3 ChinaChina 2010 Corn (maize) nicosulfuron 9 ALS inhibitors (B/2)
77Digitaria sanguinalisLarge Crabgrass5656
4 ChinaChina 2011 Cotton quizalofop-P-ethyl 9 ACCase inhibitors (A/1)
77Digitaria sanguinalisLarge Crabgrass5672
5 Czech RepublicCzech Republic 2005 Railways atrazine 12 Photosystem II inhibitors (C1/5)
77Digitaria sanguinalisLarge Crabgrass5263
6 FranceFrance 1983 Corn (maize) atrazine 17 Photosystem II inhibitors (C1/5)
77Digitaria sanguinalisLarge Crabgrass461
7 FranceFrance 2005 Carrots cycloxydim, fluazifop-P-butyl, haloxyfop-methyl, and quizalofop-P-ethyl 17 ACCase inhibitors (A/1)
77Digitaria sanguinalisLarge Crabgrass6748
8 FranceFrance 2015 Corn (maize) foramsulfuron, and nicosulfuron 17 ALS inhibitors (B/2)
77Digitaria sanguinalisLarge Crabgrass11010
9 ItalyItaly 2006 Soybean cycloxydim, and fluazifop-P-butyl 24 ACCase inhibitors (A/1)
77Digitaria sanguinalisLarge Crabgrass5355
10 PolandPoland 1995 Orchards atrazine 33 Photosystem II inhibitors (C1/5)
77Digitaria sanguinalisLarge Crabgrass377
11 United States (Wisconsin) United StatesWisconsin1992 Carrots, and Onions fluazifop-P-butyl, and sethoxydim 45 ACCase inhibitors (A/1)
77Digitaria sanguinalisLarge Crabgrass417
12 United States (Georgia) United StatesGeorgia2008 Turf sethoxydim 45 ACCase inhibitors (A/1)
77Digitaria sanguinalisLarge Crabgrass7787
Literature about Similar Cases

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