INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 5 (LEGACY C1 C2) RESISTANT LADYSTHUMB
(Polygonum persicaria)


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

Czech Republic
INTRODUCTION BLACKGRASS
Blackgrass (Alopecurus myosuroides) is a monocot weed in the Poaceae family.  In Belgium this weed first evolved multiple resistance (to 4 herbicide sites of action) in 1996 and infests Railways.  Multiple resistance has evolved to herbicides in the Groups 1 (Legacy A), Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B), PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2), and Inhibition of Microtubule Assembly 2 HRAC Group 3 (Legacy K1).  These particular biotypes are known to have resistance to atrazine, cyanazine, lenacil, prometryne, simazine, and terbutryne and they may be cross-resistant to other herbicides in the Groups 1 (Legacy A), Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B), PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2), and Inhibition of Microtubule Assembly 2 HRAC Group 3 (Legacy K1).

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 Nov 21, 2000 )

Common NameBlackgrass
SpeciesAlopecurus myosuroides
GroupInhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

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

Inhibition of Microtubule Assembly 2 HRAC Group 3 (Legacy K1)
Herbicidesatrazine, cyanazine, lenacil, prometryne, simazine, and terbutryne
LocationBelgium
Year1996
Situation(s)Railways
Contributors - (Alphabetically)Jan Mikulka 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Jan Mikulka
See map. Praha - Kolvin. All areas of Czech Republic railway.

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GENERAL

Jan Mikulka
Cross-resistance to simazine, prometryne, terbutryne, terbuthylazine, cyanazin, chloridazon, lenacil.

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Blackgrass biotype with this Blackgrass 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 1, 2, 5, 3 resistant Blackgrass 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 multiple resistant Blackgrass from Belgium please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

JAN MIKULKA
Institute Of Plant Protection
Research Inst. Of Crop Protection
370 Olsen Blvd
Heep Center, Room 339, Department of Soil& Crop Sciences
Prague, 6 161 06
Czech Republic
Email Jan Mikulka

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Belgium have been instrumental in providing you this information. Particular thanks is given to Jan Mikulka for providing detailed information.
Herbicide Resistant Ladysthumb Globally
(Polygonum persicaria)
Herbicide Resistant Ladysthumb Globally
(Polygonum persicaria)
Drag a column header and drop it here to group by that column
Herbicide Resistant Ladysthumb Globally
(Polygonum persicaria)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Czech RepublicCzech Republic 1989 Railways atrazine, cyanazine, lenacil, prometryne, simazine, and terbutryne 12 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
136Polygonum persicariaLadysthumb82
2 FranceFrance 1980 Corn (maize), and Cropland atrazine 17 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
136Polygonum persicariaLadysthumb467
3 New ZealandNew Zealand 1980 Corn (maize) atrazine 30 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
136Polygonum persicariaLadysthumb157
4 NorwayNorway 2009 Spring Barley, and Wheat tribenuron-methyl 31 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
136Polygonum persicariaLadysthumb10977
5 United States (Michigan) United StatesMichigan2001 Blueberries atrazine, and simazine 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
136Polygonum persicariaLadysthumb5178
Literature about Similar Cases

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Heap, I.  The International Herbicide-Resistant Weed Database.  Online.  Thursday, June 17, 2021 .  Available  www.weedscience.org Copyright © 1993- 2021 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.