INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 5 (LEGACY C1 C2) RESISTANT LARGE CRABGRASS
(Digitaria sanguinalis)


PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)

Czech Republic
INTRODUCTION LARGE CRABGRASS
Large Crabgrass (Digitaria sanguinalis) is a monocot weed in the Poaceae family.  In Czech Republic this weed first evolved resistance to Group 5 (Legacy C1 C2) herbicides in 2005 and infests Railways.   Group 5 (Legacy C1 C2) herbicides are known as PSII inhibitors - Serine 264 Binders (Inhbition of Photosynthesis at PSll - Serine 264 Binders ).  Research has shown that these particular biotypes are resistant to atrazine and they may be cross-resistant to other Group 5 (Legacy C1 C2) 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 Jan 30, 2006 )

Common NameLarge Crabgrass
SpeciesDigitaria sanguinalis
GroupPSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
Herbicidesatrazine
LocationCzech Republic
Year2005
Situation(s)Railways
Contributors - (Alphabetically)Jaroslav Salava 
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ACADEMIC ASPECTS

Confirmation Tests

Laboratory 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.
 
Genetics

Genetic studies on HRAC Group 5 resistant Large Crabgrass indicate that the inheritance is determined by a cytoplasmic trait.  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

Studies on the mechanism of resistance of Group 5 (Legacy C1 C2) resistant Large Crabgrass from Czech Republic indicate that resistance is due to an altered target site.  There may be a note below or an article discussing the mechanism of resistance in the Fact Sheets and Other Literature
 
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 5 (Legacy C1 C2) resistant Large Crabgrass from Czech Republic please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

JAROSLAV SALAVA
Research Associate
Research Institute Of Crop Production
Molecular Biology
P.o. Box 311
Czech Republic
Email Jaroslav Salava

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Czech Republic have been instrumental in providing you this information. Particular thanks is given to Jaroslav Salava 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 ArgentinaArgentina 2019 Soybean glyphosate 48 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
77Digitaria sanguinalisLarge Crabgrass23239
2 Australia (South Australia) AustraliaSouth Australia1993 Onions, and Vegetables fluazifop-butyl, haloxyfop-methyl, and imazethapyr 1 Multiple Resistance: 2 Sites of Action
Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A)
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
77Digitaria sanguinalisLarge Crabgrass16
3 Canada (Ontario) CanadaOntario2011 Carrots, and Onions clethodim, fenoxaprop-ethyl, fluazifop-butyl, quizalofop-ethyl, and sethoxydim 7 Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A)
77Digitaria sanguinalisLarge Crabgrass5678
4 ChinaChina 2010 Corn (maize) nicosulfuron 9 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
77Digitaria sanguinalisLarge Crabgrass5656
5 ChinaChina 2011 Cotton quizalofop-ethyl 9 Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A)
77Digitaria sanguinalisLarge Crabgrass5672
6 Czech RepublicCzech Republic 2005 Railways atrazine 12 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
77Digitaria sanguinalisLarge Crabgrass5263
7 FranceFrance 1983 Corn (maize) atrazine 17 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
77Digitaria sanguinalisLarge Crabgrass461
8 FranceFrance 2005 Carrots cycloxydim, fluazifop-butyl, haloxyfop-methyl, and quizalofop-ethyl 17 Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A)
77Digitaria sanguinalisLarge Crabgrass6748
9 FranceFrance 2015 Corn (maize) foramsulfuron, and nicosulfuron 17 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
77Digitaria sanguinalisLarge Crabgrass11010
10 ItalyItaly 2006 Soybean cycloxydim, and fluazifop-butyl 24 Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A)
77Digitaria sanguinalisLarge Crabgrass5355
11 New ZealandNew Zealand 2022 Corn (maize) nicosulfuron 30 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
77Digitaria sanguinalisLarge Crabgrass25262
12 PolandPoland 1995 Orchards atrazine 33 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
77Digitaria sanguinalisLarge Crabgrass377
13 SwitzerlandSwitzerland 2021 Corn (maize) nicosulfuron 41 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
77Digitaria sanguinalisLarge Crabgrass27290
14 United States (Wisconsin) United StatesWisconsin1992 Carrots, and Onions fluazifop-butyl, and sethoxydim 45 Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A)
77Digitaria sanguinalisLarge Crabgrass417
15 United States (Georgia) United StatesGeorgia2008 Turf sethoxydim 45 Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A)
77Digitaria sanguinalisLarge Crabgrass7787
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